Upper critical field in the organic superconductor beta"-(ET)2SF5CH2CF2SO3: Possibility of Fulde-Ferrell-Larkin-Ovchinnikov state

«   »
Su Mo Tu We Th Fr Sa
31 1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 1 2 3 4
Date/Time:Thursday, 07 Oct 2010 from 4:10 pm to 5:00 pm
Location:Physics Room 5
Phone:515-294-5630
Channel:Condensed Matter Physics
Actions:Download iCal/vCal | Email Reminder
Dr. Kyuil Cho
Ames Laboratory
Iowa State University

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.