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Host: Prof. Vadim Grinenko
Venue: TDLI Meeting Room N600
Tencent Meeting link: https://meeting.tencent.com/dm/TTXEcz9iyeLS
Meeting ID: 975232008, no password
Abstract:
High magnetic fields and superconductivity are usually incompatible. The magnetic field favors parallel electron spins, while superconductivity requires Cooper pairs with antiparallel spins. There exist, however, some superconductors, in which superconductivity survives to extraordinary high magnetic fields as we found in studies using static and pulsed magnetic fields up to 70 T provided at the Dresden High Magnetic Field Laboratory.
As a first example, I will present our robust evidence for the existence of the so-called Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state in quasi-two-dimensional organic superconductors. Besides specific-heat and magnetization results, NMR studies give strong microscopic evidence for the realization of the FFLO state. A one-dimensional sinusoidal order-parameter modulation can favorably explain the NMR spectra in this high-field low-temperature phase. I will further discuss the recently discovered heavy-fermion superconductor UTe2. This material shows multiple unconventional superconducting phases under field and pressure with unusually large upper critical fields. For certain field orientations, superconductivity even reappears at very high fields and survives to a record-breaking upper critical field of about 73 T. The Jaccarino-Peter effect is a likely mechanism for the appearance of this reentrant superconductivity.
Biography:
Academic education and professional Career:
2004-Now | Professorship at University of Technology Dresden (TUD) and director of the Hochfeld-Magnetlabor Dresden (HLD) at the HZDR |
2001-2004 | Professorship for “Low-Temperature Physics” at the University of Technology Dresden (TUD), Germany |
1995 | Habilitation in Experimental Physics at Universität Karlsruhe (TH), Germany |
1990-1991 | Postdoc at Argonne National Laboratory, Argonne, Illinois, USA |
1988 | PhD, Universität Karlsruhe (TH), Germany |
1985 | Diploma (Physics) at RWTH Aachen, Germany |
Selected other (Academic) Positions:
2023-Now | Member of the Scientific Advisory Board of the Center for Electronic Correlations and Magnetism (EKM), Augsburg University |
2015-2021 | Member of the selection committee for the Heinz Maier-Leibnitz prize |
2011- Now | Outstanding Referee for the journals of the American Physical Society |
2008- Now | Head of the Scientific and Technical Council (Wissenschaftlich-Technischer Rat) of the Helmholtz-Zentrum Dresden-Rossendorf |
2007-2015 | Advisory Professorship at the Huazhong University of Science and Technology, Wuhan, China |
2004-2012 | Member of the DFG (Deutsche Forschungsgemeinschaft) review board; 2010 - 2012 chair of the review board “Physics of Condensed Matter” |
2003-2005 | Dean of student affairs of the physics department at the TU Dresden |
1999-2001 | Lecturer at Universität Karlsruhe (TH), Germany |
1986-1999 | Research Associate and Scientific Assistant, Universität Karlsruhe (TH), Germany |
1985-1986 | Research Associate at RWTH Aachen |