Superconductor-Insulator Phase Separation Induced by Rapid Cooling in kappa-(ET)_2Cu[N(CN)_2]Br

O. J. Taylor; A. Carrington; J. A. Schlueter

doi:10.1103/PhysRevB.77.060503

Superconductor-Insulator Phase Separation Induced by Rapid Cooling in kappa-(ET)_2Cu[N(CN)_2]Br

Superconductivity 2009-11-13 v1 Strongly Correlated Electrons

Authors: O. J. Taylor , A. Carrington , J. A. Schlueter

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Abstract

We present measurements of the low temperature specific heat of single crystals of kappa-(ET)_2Cu[N(CN)_2]Br as a function of the cooling rate through the glasslike structure transition at $\sim$ 80K. We find that rapid cooling produces a small (< 4%) decrease in the superconducting transition temperature accompanied by a substantial (up to 50%) decrease in the normal-state electronic specific heat. A natural explanation of our data is that there is a macroscopic phase separation between superconducting and insulating regions in rapidly cooled samples.

Keywords

superconductor-insulator phase separation rapid cooling specific heat kappa-(ET)_2Cu[N(CN)_2]Br glasslike transition ultracold Fermi gases superconducting transition temperature

Cite

@article{arxiv.0801.2502,
  title  = {Superconductor-Insulator Phase Separation Induced by Rapid Cooling in kappa-(ET)_2Cu[N(CN)_2]Br},
  author = {O. J. Taylor and A. Carrington and J. A. Schlueter},
  journal= {arXiv preprint arXiv:0801.2502},
  year   = {2009}
}

Comments

4 pages, to appear in Phys. Rev. B (Rapid Comm)

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