Upper critical field in the organic superconductor beta"-(ET)2SF5CH2CF2SO3: Possibility of Fulde-Ferrell-Larkin-Ovchinnikov state
Date/Time: | Thursday, 07 Oct 2010 from 4:10 pm to 5:00 pm |
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Location: | Physics Room 5 |
Phone: | 515-294-5630 |
Channel: | College of Liberal Arts and Sciences |
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We report upper critical-field measurements in the metal-free-all-organic superconductor beta"-(ET)2SF5CH2CF2SO3 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.