The Fulde–Ferrell–Larkin–Ovchinnikov state in the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 as observed in magnetic-torque experiments
The Fulde–Ferrell–Larkin–Ovchinnikov state in the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 as observed in magnetic-torque experiments
Bergk, B.; Demuer, A.; Sheikin, I.; Wang, Y.; Wosnitza, J.; Nakazawa, Y.; Lortz, R.
Abstract
We present magnetic-torque experiments on the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 for magnetic fields applied parallel to the 2D superconducting layers. The experiments show a crossover from a second-order to a first-order transition when the upper critical field reaches 21 T. Beyond this field, which we interpret as the Pauli limit for superconductivity, the upper critical field line shows a pronounced upturn and a phase transition line separates the superconducting state into a low- and a high-field phase. We interpret the data in the framework of a Fulde–Ferrell–Larkin–Ovchinnikov state.
Beteiligte Forschungsanlagen
- Hochfeld-Magnetlabor (HLD)
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Physica C 470(2010), S586-S588
DOI: 10.1016/j.physc.2009.11.151
Cited 11 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-15069