Magnetic enhancement of superconductivity

Roman Movshovich (), Andrea Bianchi, Cigdem Capan, Marcelo Jaime and R.G. Goodrich
Additional contact information
Roman Movshovich: Los Alamos National Laboratory
Andrea Bianchi: Hochfeld Labor Dresden, Forschungszentrum Rossendorf
Cigdem Capan: Los Alamos National Laboratory
Marcelo Jaime: Los Alamos National Laboratory
R.G. Goodrich: Louisiana State University

Nature, 2004, vol. 427, issue 6977, 802-802

Abstract: Abstract An inhomogeneous superconducting state, not yet conclusively identified, was predicted by Fulde and Ferrell1 and Larkin and Ovchinnikov2 (FFLO) to arise in superconductors with strong Pauli limiting, a consequence of the electrons' Zeeman (spin) energy in a magnetic field. Radovan et al.3 propose that the observed cascades of steps in magnetization of the heavy fermion superconductor CeCoIn5, within the recently discovered second low-temperature state3,4, are due to transitions between Landau-level (LL) states with different m-quanta vortices, expected under certain conditions when the magnetic field is swept within the FFLO state5,6,7. The authors then conclude that the observed steps in magnetization constitute a proof that the low-temperature state in CeCoIn5 is indeed an FFLO state. We argue that this interpretation of the observed steps in magnetization cannot be supported on either quantitative or qualitative grounds.

Date: 2004
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DOI: 10.1038/427802a

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