Unconventional superconductivity in CeCoIn5 with magnetic texture and orbital quantization

Details Unconventional superconductivity in CeCoIn5 with magnetic texture and orbital quantization Unconventional superconductivity in CeCoIn5 with magnetic texture and orbital quantization

2003-04-23

arxiv.org/abs/cond-mat/0304526v1

Physics

Condensed Matter

Strongly Correlated Electrons

Submitted to Nature (Dec. 27, 2002)

Scientific paper

A sufficiently high magnetic field applied to a superconductor will act on both the charge and the spin of the individual electrons breaking up the Cooper pairs. If the spin effect dominates, the superconducting state can develop a texture before eventually entering the normal state with increasing magnetic field. This spatially varying superconducting state is a periodic array of magnetic walls separated by superconducting regions. Known as the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase, it was predicted in 1964. We report heat capacity measurements on the heavy fermion superconductor, CeCoIn5, which reveal a second phase transition within the superconducting state, clear evidence of the FFLO phase. We also report magnetization measurements that display a cascade of first order phase transitions within the FFLO region. Each transition indicates an increase in orbital momentum of the superconducting order parameter and corresponds to a specific Landau level vortex state comprised of multiquanta vortices. The experimental realization of the FFLO state provides a new opportunity to study the symbiosis of magnetism and superconductivity, two states of matter once thought to be mutually exclusive.

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