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J. Kehrle V.I. Zdravkov G. Obermeier J. Garcia‐Garcia A. Ullrich C. Müller R. Morari A.S. Sidorenko S. Horn L.R. Tagirov R. Tidecks 《Annalen der Physik》2012,524(1):37-47
Ferromagnet/Superconductor/Ferromagnet (F/S/F) trilayers, in which the establishing of a Fulde‐Ferrell Larkin‐Ovchinnikov (FFLO) like state leads to interference effects of the superconducting pairing wave function, form the core of the superconducting spin valve. The realization of strong critical temperature oscillations in such trilayers, as a function of the ferromagnetic layer thicknesses or, even more efficient, reentrant superconductivity, are the key condition to obtain a large spin valve effect, i.e. a large shift in the critical temperature. Both phenomena have been realized experimentally in the Cu41Ni59/Nb/Cu41Ni59 trilayers investigated in the present work. 相似文献
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The Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) states, characterized by Cooper pairs condensed at finite-momentum are, at the same time, exotic and elusive. It is partially due to the fact that the FFLO states allow superconductivity to survive even in strong magnetic fields at the mean-field level. The effects of induced interactions at zero temperature are calculated in both clean and dirty cases, and it is found that the critical field at which the quantum phase transition to an FFLO state occurs at the mean-field level is strongly suppressed in imbalanced Fermi gases. This strongly shrinks the phase space region where the FFLO state is unstable and more exotic ground state is to be found. In the presence of high level impurities, this shrinkage may destroy the FFLO state completely. 相似文献
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We present specific heat and thermal conductivity of the heavy fermion superconductor CeCoIn5 in the vicinity of the superconducting
critical fieldH
c2, measured with magnetic field in the plane of this quasi-2D compound and at temperatures down to 50 mK. The superconducting
phase diagram and the first order nature of the superconducting phase transition at high fields close to a critical fieldH
c2 indicate the importance of the Pauli limiting effect in CeCoIn5. In the same range of magnetic field we observe a second specific heat anomaly within the superconducting state, and interpret
it as a signature of a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) inhomogeneous superconducting state. In addition, the thermal
conductivity data as a function of field display a kink at a fieldH
k below the superconducting critical field, which closely coincides with the low temperature anomaly in specific heat tentatively
identified with the appearance of the FFLO superconducting state. The enhancement of thermal conductivity within the FFLO
state calls for further theoretical investigations of the real space structure of the order parameter (and in particular,
the structure of vortices) and of the thermal transport within the inhomogeneous FFLO state. 相似文献
4.
Ekhard K.H. Salje 《Phase Transitions》2013,86(1):2-14
Some domain boundaries contain functionalities which do not exist in the bulk. Typical examples are (super-) conducting twin walls in WO3, highly conducting walls in BiFeO3 and in structural interfaces between SrTiO3 and LaAlO3, and ferroelectric walls in CaTiO3. The emerging field of ‘Domain Boundary Engineering’ endeavors to generate such functional interfaces in a multitude of materials for applications in device materials. Some of the recent successes are reviewed together with suggestions for further research. 相似文献
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