Journal
PHYSICAL REVIEW B
Volume 79, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.220507
Keywords
mixed state; organic superconductors; superconducting critical field; superconducting transitions
Funding
- U.S. Department of Energy, BES [DE-FG02-05ER46214]
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We report upper critical-field measurements in the metal-free-all-organic superconductor beta(')-(ET)(2)SF5CH2CF2SO3 obtained from measuring the in-plane penetration depth using the tunnel diode oscillator technique. For magnetic field applied parallel to the conducting planes the low-temperature upper critical fields are found to exceed the Pauli limiting field calculated by using a semiempirical method. Furthermore, we found a signature that could be the phase transition between the superconducting vortex state and the Fulde-Ferrell-Larkin-Ovchinnikov state in the form of a kink just below the upper critical field and only at temperatures below 1.23 K.
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