High frequency studies of the organic superconductor kappa-bis-ethylenedithio cuprous dicyanonitrobromide

We report measurements of the rf vortex penetration depth $\lambda$(B) of the organic compound, $\kappa$-ET$\sb2$Cu$\lbrack$N(CN)$\sb2\rbrack$Br as a function of temperature, magnetic field, and the angle made by the applied magnetic field with the ac-planes of the crystal. For$\rm\vec B\sb{dc}$$\perp$ planes, we show that the crossover B$\sp{*}$ can be described quantitatively by the 3D Lindemann melting theory; thus, it corresponds to the melting of the vortex lattice in $\kappa$-(ET)$\sb2$Cu$\lbrack$N(CN)$\sb2\rbrack$Br and lies very close to the irreversibility line. This is the first experimental evidence for vortex lattice melting in the ET family of organic superconductors. In the vortex-liquid state, we argue that the saturation of the vortex penetration depth in a magnetic field results from the finite size of the sample. Our results do not have the scaling form predicted by the the Coffey-Clem model in contrast to previous findings.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Tea, Nim Hak

Contributors dc:contributor

• Salamon, Myron B.

• Physics, Condensed Matter

Statement dc:rights

• Copyright 1995 Tea, Nim Hak

Language dc:language

eng

Identifier

AAI9624509
(UMI)AAI9624509

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/21260