A bulk 2D Pauli Limited Superconductor

T. Coffey; C. Martin; C. C. Agosta; Tatsue Kinoshota; and M. Tokumoto

arXiv:cond-mat/0303341·cond-mat.supr-con·May 29, 2013

A bulk 2D Pauli Limited Superconductor

T. Coffey, C. Martin, C. C. Agosta, Tatsue Kinoshota, and M. Tokumoto

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TL;DR

This paper maps the critical magnetic field phase diagram of a highly anisotropic organic superconductor, revealing Pauli-limited behavior and enabling calculation of the superconducting energy gap.

Contribution

It provides a detailed phase diagram for an organic superconductor under magnetic fields parallel to layers, highlighting Pauli-limited effects and the influence of spin-orbit scattering.

Findings

01

Critical fields are Pauli-limited, enabling energy gap calculation.

02

The phase diagram is nearly perfect and anisotropic.

03

Spin-orbit scattering and many-body effects influence the measurements.

Abstract

We present a nearly perfect Pauli-limited critical field phase diagram for the anisotropic organic superconductor $\alpha $- (E T)$ _2 $N H$ _4 $(S C N)$ _4 $w h e n t h e a ppl i e d ma g n e t i c f i e l d i sor i e n t e d p a r a l l e l t o t h eco n d u c t in g l a y er s . T h ecr i t i c a l f i e l d s ($ {H_{c_2} $) w er e f o u n d b y u seo f p e n e t r a t i o n d e pt hm e a s u r e m e n t s . B ec a u se$ {H_{c_2}$ is Pauli-limited, the size of the superconducting energy gap can be calculated. The role of spin-orbit scattering and many-body effects play a role in explaining our measurements.

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