Alexandre BOUZDINE

Thèmes

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Collaborations

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Publications

List of my publications in Hal archive

Short Biography

Curriculum vitae

ALEXANDRE BOUZDINE (A. BUZDIN)

• Senior Member of the “Institut Universitaire de France” (Holder of the Chair “Physics of Superconductivity”), 103, bd Saint-Michel, 75005 Paris,

• Full Professor of the exceptional class of the University of Bordeaux,
  Condensed Mater Theory Group Leader at Laboratoire Ondes et Matière d’Aquitaine, UMR5798
  351, cours de la Libération, Bât A4, 33405 TALENCE CEDEX, FRANCE
  phone : (33) 5 40 00 25 02
  email

PROFESSIONAL CARRIER

VISITING POSITIONS HELD

• Visiting Professor at the University of Kyoto, Physics Department, April-May 2007 ;
• Visiting Scientist at Argonne National Laboratory, Material Science Division, 9700 South Cass Av., Argonne, Ill 60439, USA (host – A. Abrikosov, March-April 2010, May– Juin 2006, January– February 2003, July – August 2000) ;
• Invited scientist, Laboratory of Theoretical Physics, Centre de Physique Théorique et de Modélisation de Bordeaux, Bordeaux, France (April – August 1996) ;
• Invited scientist, Laboratory of Cryophysics, SPSMS/DRFMC at CEA, Grenoble, France (August 1995- April 1996) ;
• Invited Professor of the University Joseph Fourier, Grenoble, France (February–July 1995 ; December 1993–June 1994 ; May–July 1992 ; February 1990) ;
• Visiting Scientist at Ecole Polytechnique Fédérale de Lausanne, Département de Physique, Institut de Génie Atomique, Lausanne, Switzerland (July 1994–January 1995) ;
• Visiting Scientist (one year) at Argonne National Laboratory, Material Science Division, 9700 South Cass Av., Argonne, Ill 60439, USA (host – A. Abrikosov, September 1992 – November 1993) ;
• High-level fellowship of French Ministry of Research and Technology, LEPES, CNRS, Grenoble, France ; (October 1991- April 1992).

TEACHING EXPERIENCE

Author of Two Books of Physical Problems for high school students and more than twenty popular articles on physics, co-author of the book “Mécanique du point”, published by Editions “Dunod” (1998). Authors of the articles in “Physics World” , “Images de la Physique”, “La Recherche”.

SUPERVISING OF THESES

Supervisor of fifteen PhD students.

Participation in more than 60 commissions on PhD thesis and Habilitation in France and abroad.

HONORS

Distinguished Performance Awards :

SCIENTIFIC RESEARCH

Author of more than 250 articles published in referring journals, invited speaker on many International and National Conferences on Low Temperature Physics, Superconductivity and Magnetism.

More than 6200 citations (without self-citations – ISI, Web of Knowledge) and the H-index = 41.

Research work and principal scientific achievements of Alexander Buzdin (AB)

More than 250 publications (6200 citations WS and H=41) of AB are dedicated to many problems of the theory of condensed matter, but mostly to superconductivity, magnetism and low-dimensional systems. AB elaborated an exhaustive theory of magnetic s-wave superconductors – mysterious substances discovered by the late B. Matthias, which underwent first a superconducting and then (at lower temperatures) a ferromagnetic transition. He explained also the properties of antiferromagnetic superconductors. The domain structure is inherent to all ferromagnets and the recent discovery of the superconducting ferromagnets raises the question of the modification of this domain structure by superconductivity. In the framework of the general London theory, applicable to both singlet and triplet superconductors, AB demonstrated that superconductivity leads to a dramatic shrinkage of the domain width . The presence of this dense domain structure has to be taken into account for all magnetic measurements on superconducting ferromagnets, and the study of the domain structure evolution provides the important information on the mechanisms of superconductivity and magnetism interplay. Another achievement was his theory of enhanced superconductivity of twinning planes which described an unusual phenomenon discovered experimentally. With his colleagues he created a comprehensive description of the Peierls and spin-Peierls transitions in quasi-1d systems and of the influence of the magnetic field on the latter.

Later he studied vortices in anisotropic Type II superconductors. He discovered that vortices in layered superconductors in a tilted magnetic field are attracted to each other and tend to form chains ; this was later confirmed experimentally. He predicted also the possibility of multi-quanta vortices attached to columnar defects and this was also confirmed in subsequent experiments. Another accomplishment was the exact solution of the problem of the interaction of vortices with defects of various shapes which lead to interesting practical recommendations.

AB demonstrated that in a superconducting multilayered system with alternating interlayer coupling a new type of nonuniform superconducting state can be realized under an in-plane magnetic field. The Zeeman effect in this state is compensated by the energy splitting between bonding and antibonding levels. At low temperature such a compensation mechanism leads to field-induced superconductivity which may exceed many times the paramagnetic limit. In this new high field superconducting state the phase of the superconducting order parameter is opposite in the adjacent layers. In addition the modulation of the order parameter in the plane also appears. These findings show a tremendous perspective of the nano-fabricated superconducting material for applications.

AB contributed substantially in the theory of the inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting state. He provided the exact solution of the FFLO problem for the quasi-1D superconductors, studied the role of the orbital effect in the phase FFLO and discovered the existence of new multi-quanta solutions for an order parameter.

AB’s work on superconductor-ferromagnet multilayers gained a wide recognition and has been awarded recently by 2013 the Holweck Medal and prize (joint award by the UK Institute of Physics and the French Physical Society ). In his pioneering theoretical studies of superconductor-ferromagnet (S-F) multilayer systems he found an unusual damped oscillatory behaviour of the superconducting order parameter in the ferromagnetic layer. These oscillations on the nanoscopic range are a manifestation of the proximity effect for the Cooper pairs in the presence of the Zeeman’s splitting of the electron’s level in the ferromagnet. Cooper pairs penetrate into F layer and induce superconductivity there. This gives a unique opportunity to study the superconductivity under the influence of a large internal exchange field. Such situation cannot be realized in bulk singlet superconductors and therefore the S/F proximity effect serves in some sense as a “laboratory“ to explore the superconductivity under the extreme conditions.

The unusual S/F proximity effect leads to many interesting phenomena. In particular, AB predicted the formation of the Josephson SFS “Pi-junctions”. In contrast with usual “Pi-junctions”, where the sign of the superconducting order parameter is the same on both superconducting layers, in Pi-junctions it is the opposite one. Such Pi-junction serves a source of the phase difference of the superconducting order parameter and may induce the spontaneous superconducting current in circuit containing Pi-junctions. The transitions from the 0-junction to a Pi-junction can be achieved by changing the thickness of the ferromagnetic layer or the temperature. They result in the vanishing of the critical current. It is very important that this “Pi-state” is quite robust and exists in dirty or clean limits in weak and strong ferromagnets and in the presence of the magnetic scattering. In the subsequent works in continuation of his previous studies, AB has predicted the oscillations of the density of states with thickness in an F-layer being in contact with a superconductor. Another important achievement is the prediction of the spin-valve effect in F/S/F structures.

AB demonstrated a very special character of the proximity effect between a superconductor and magnetic normal metal with a spin-orbit interaction of the Rashba type. It occurs that the superconducting order parameter not only decays but its phase rotates. This leads to the formation of an absolutely new type of the Josephson junction with arbitrary phase difference at the ground state Phi. Incorporated in the superconducting circuit the Phi-Josephson generates a non-dissipative spontaneous current. The value of Phi depends linearly on the magnetic moment. All these observations are of a major importance for the superconducting spintronics and dynamic interaction between magnetic and superconducting sybsystems. These findings open completely new field in superconductivity and magnetism which is both important for academic research and potential applications. As a simple example let us mention that in these junctions the application of the phase difference (current) will generate the rotation of the magnetic moment and inversely the reorientation of the magnetic moment will affect current.

All these new phenomena were subsequently observed on experiment and AB may be considered as the initiator of a new and very rich physics of the S/F systems which is in a full expansion now.

At the end of 2005, AB published a comprehensive review on superconductor/ferromagnet proximity effect in Review of Modern Physics where he summarised his theoretical studies in this field (this review is cited more than 800 times by now).

OTHER SCIENTIFIC ACTIVITIES

Since 2008 member of French National University Committee (CNU) –section “Solid State Physics”

Referee in the following scientific journals : Nature, Nature Materials, Phys. Rev. B, Phys. Rev. Lett., Physica C, Physica B, Europhysics Letters, Advances in Physics, Review of Modern Physics and others as well.

Member of Editorial Committee of Journal « Comptes Rendus de l’Académie des Sciences. Physique ».

Since 2012 – an external member of the Advisory Board of UK Superconducting Ferromagnetic Metamaterials Consortium. Expert for AERES, France. Expert for Engineering and Physical Sciences Research Council (UK), expert for German-Israeli Foundation for Scientific Research and Development, expert for NSF (USA), expert of Programme « Metusalem » Belgium government, expert for Netherland science foundation.

Since 2005 – expert for ANR, AERS France.

1999-2004 – expert for European program INTAS.

Member of Advisory Board and Programme Committee of many International Conferences and Workshops.

Participation at the recent Conferences as an invited/keynote speaker ( 2008-2013) :

1. A. Buzdin “Long ranged proximity effects in S/F hybrid systems” , 9th International Workshop on Nanomagnetism and Superconductivity at the Nanoscale (Coma-ruga, Spain, July 2013)
2. A. Buzdin “Magnetic moment manipulation by triplet Josephson current” International Conference on Vortex Matter in Nanostructured Superconductors (Rhodes, Greece, September 2013)
3. A. Buzdin “ Vortex molecules”, 14th International Workshop on Vortex Matter in Superconductors (Nanjing, China, May 2013)
4. A. Buzdin Plenary talk “Non-uniform (FFLO) states and quantum oscillations in superconductors and superfluid ultracold Fermi gases”, 17 International Conference on Nanophysics and Nanoelectronics (N. Novgorod, Russia, March 2013)
5. A. Buzdin “Non-uniform superconductivity” International Conference on High Magnetic Field Science and Technology (Miraflores, Spain, November 2012)
6. A. Buzdin “In-plane magnetic field anisotropy in FFLO state in layered superconductors”, International Workshop on Nanoscale Superconductivity and Fluxonics (Leuven, Belgium, June 2012)
7. A. Buzdin “Interference Phenomena and Long–Range Proximity Effect in SFS Systems”, International Workshop MAMA-HYBRIDS – Multifunctional Hybrids and Organics, (Ischia, Italy, October 2012)
8. A. Buzdin “Vanishing Meissner effect as a hallmark of in—plane FFLO instability in superconductor — ferromagnet layered systems”, International Conference “Superconducting nanohybrids ” (San Sebastian, Spain, September 2012)
9. A. Buzdin “Interference effect and long ranged triplet superconductivity in superconductor-ferromagnet hybrid systems” International Workshop on Quantum Matter from the Nano- to the Macroscale (Dresden, Germany, June 2012)
10. A. Buzdin Plenary talk “Coupling between magnetism and superconductivity in S/F/S Josephson junctions” International Magnetics Conference, INTERMAG 2012 (Vancouver, Canada, May 2012)
11. A. Buzdin Plenary talk « Superconductor – Ferromagnet Nanostructures”, International Conference on Superconductivity and Magnetism – ICSM 2012 (Istanbul, Turkey, April 2012)
12. A. Buzdin “Fluctuating pancake vortices”, 4th International Conference on Fundamental Problems of High Temperature Superconductivity (Moscow, Russia, October 2011)
13. A. Buzdin “Domain walls and long-ranged triplet correlations”, International Conference “Superconducting hybrids : from conventional to exotic” (Villard de Lans, France, September 2011)
14. A. Buzdin “Vortex molecules and complex vortex lattices”, International Conference on Complex Phenomena in Superconducting and Magnetic Systems (Oyestese, Norway, September 2011)
15. Plenary talk A. Buzdin “Non-uniform (FFLO) states and quantum oscillations in superconductors and superfluid ultracold Fermi gases” International Conference on Electronic Crystals” ECRYS- 2011(Cargese, France August 2011)
16. A. Buzdin “Domain structure in ferromagnetic superconductors and superconductor-ferromagnet bilayers” 13th International Conference on Vortex Matter in Superconductors (Chicago, USA, August 2011)
17. International Conference “Meeting of Modern Science and School Physics” at International Center for Theoretical Physics (Trieste, Italy, Aprli -May 2011)
18. A. Buzdin “Magnetic Moment Manipulation by a Josephson Current” March Meeting of the Mediterranean Institute of Fundamental Physics (MIFP) (Castelli Romani, Italy, March 2011)
19. A. Buzdin Plenary talk “Coexistence of Superconductivity and Magnetism”, Mediterranean School on Nano-physics, (Marrakech, Morocco, December 2010)
20. A. Buzdin “Superconductivity and Magnetism” International workshop “On the heavy Fermion Road” (Paris, France, August 2010)
21. A. Buzdin Plenary talk “Magnetic superconductors” International Summer School “Trends in Modern Condensed Matter Theory” (St. Petersburg, Russia, July 2010)
22. A. Buzdin “Perspectives of the applications of the superconducting-ferromagnet systems” Russian-French Workshop on Nanosciences and Nanotechnologies (Paris, France, September 2010)
23. A. Buzdin “Vortex molecules in thin films of layered superconductors”, NES-ESF Conference on Nanoscale Superconductivity, Fluxonics and Plasmonics, (Crete, Greece, September 2010)
24. A. Buzdin “Magnetic Moment Manipulation by a Josephson Current”, International Conference on Superconductivity and Magnetism -ICSM 2010 (Antalya, Turkey, April 2010)
25. A. Buzdin “Vortex clusters and multiquanta flux lattices in thin films of anisotropic superconductors”, Italo-Russian-French meeting, (Castel Gandolfo, Italy, March 2010)
26. A. Buzdin “On the Way to Superconducting Spintronics”, 9th International Conference on Materials and Mechanisms, M2S-IX (Tokyo, Japan, September 2009)
27. A. Buzdin “Vortex molecules in thin films of layered superconductors”, The 12th International Conference on Vortex Matter in Superconductors, (Yamanashi, Japan, September 2009)
28. A. Buzdin Plenary talk “Superfluidity and cold gases” Student Summer School of Montenegro (Ivanovo Korito, Montenegro, August 2009)
29. A. Buzdin “Advances in Superconductivity” International Conference on Quantum Phenomena at Nanoscale, (Cotor, Montenegro, September 2009)
30. A. Buzdin “Moment manipulation by a Josephson current”, International Advanced Research Workshop on Mesoscopic and Strongly Correlated Electron Systems (Chernogolovka, Russie, Juin 2009)
31. A. Buzdin Plenary talk “Superconductor-ferromagnet nanostructures”, 6 Journées SUPRA 2009 (Fréjus, France, Mai 2009)
32. A. Buzdin Plenary talk “Nanoscale Magnetism and Superconductivity”, International Conference “Nanospain 2009” (Zaragoza, Spain, March, 2009)
33. A. Buzdin Plenary talk “ Coexistence between superconductivity and magnetism at the nanoscale”, International Conference on Frontiers of Superconductivity (Recife, Brazil, December 2008)
34. A. Buzdin “Coexistence of Superconductivity and Magnetism”, National GDR Meeting « Matériaux et Interaction en Compétition » (Autrans, France, Decembre 2008)
35. A. Buzdin “Magnetic moment manipulation by a Josephson current”, International Conference “Vortices at Fifty Years” (Argonne, USA, November 2008)
36. A. Buzdin “Magnetism and Superconductivity”, International Summer Scool “Nicolas Cabrera” (Madrid, Spain, September 2008)
37. A. Buzdin “Proximity effect in superconductor-ferromagnet structures”, International Conference on Superconductivity and Magnetism (Side, Turkey, August, 2008)
38. A. Buzdin “On the way from 0 to Pi junction”, 25th International Conference on Low Temperature Physics (Amsterdam, Netherlands, August 2008)
39. A. Buzdin “Peculiar properties of the superconductor-ferromagnet structures”, International Workshop on the Interplay between Superconductivity and Magnetism at the nanoscale (Paestum, Italy, June, 2008)
40. A. Buzdin “Vortex states induced by proximity effect in hybrid ferromagnet-superconductor systems”, ESF Conference “Probing Superconductivity at the Nanoscale” (Alicante, Spain, June, 2008)
41. A. Buzdin “Problemes d’enseignment de physique moderne”, Rencontre Champlain-Montaigne (Quebec, Canada, Mai, 2008, French)
42. “Coexistence of Superconductivity and Magnetism”, Italian-Russian theoretical workshop, (Rome, Italy, March 2008)