EPL, 85 (2009) 27009
DOI: 10.1209/0295-5075/85/27009

Evolution of superconductivity from a charge-density-wave ground state in pressurized (Per)₂[ Au(mnt)₂]

D. Graf¹, J. S. Brooks^{1, 2}, M. Almeida², J. C. Dias², S. Uji³, T. Terashima³ and M. Kimata<sup>3

1</sup>   Physics/NHMFL Florida State University - Tallahassee, FL 32310, USA
²   Instituto Tecnológico e Nuclear/CFMCUL - Estrada Nacional No. 10, P-2686-953 Sacavém, Portugal, EU
³   National Institute of Materials Science - Tsukuba, Ibaraki, 305-0003 Japan

brooks@magnet.fsu.edu

received 18 November 2008; accepted in final form 23 December 2008; published January 2009
published online 30 January 2009

Abstract
By suppressing the charge density wave ground state in the highly one-dimensional organic conductor (Per)₂[ Au(mnt)₂] with quasi-hydrostatic pressure, a superconducting (SC) phase is established above a pressure of 5 kbar. The onset of superconductivity is approximately 300 mK and the upper critical field (perpendicular to the perylene stacking axis) is 50 mT. The new CDW-SC phase diagram is compared with pressure-induced density wave-SC transitions in other organic compounds.

PACS
71.20.Rv - Polymers and organic compounds.
71.45.Lr - Charge-density-wave systems.
74.62.Fj - Pressure effects.

© EPLA 2009