Probing the FFLO State in Quasi-2D Organic Superconductors using Sample Angular Rotations
ORAL
Abstract
Organic superconductors can be prime candidates to investigate the FFLO state, an exotic, inhomogeneous superconducting state existing at high magnetic fields above the paramagnetic limit, Hp, where superconductivity is normally destroyed. Our layered organic crystals are highly anisotropic and have quasi-2D structures, so the angle that their conduction planes make with an external B-field greatly affects features such as Hc2, the FFLO phase transition, and vortex dynamics such as the lock-in effect. Thus, we merge traditional Field- and Temperature-analysis with sample rotations to explore these features as a function of angle. We will present rf-penetration depth measurements made using a tunnel diode oscillator circuit on λ-(BETS)2GaCl4 and κ-(ET)2Cu(NCS)2 and compare our angular data to theoretical modeling. Combining results from field sweeps and angle rotations in pulsed- and DC-fields, respectively, we will show a preliminary 3D phase diagram of the FFLO state in Field-Angle-Temperature phase space.
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Presenters
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Brett Laramee
Clark University
Authors
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Brett Laramee
Clark University
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Raju Ghimire
Clark University
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Charles C Agosta
Clark University
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John A Schlueter
National Science Foundation
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William A Coniglio
Clark University
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Akiko Kobayashi
Nihon University