J. Phys. IV France 114 (2004) 257
DOI: 10.1051/jp4:2004114054

A new superfluid in organic molecular metals at high magnetic fields

J. Singleton¹, N. Harrison¹, A. Bangura², A. Ardavan² and L.K. Montgomery<sup>3

1</sup>  National High Magnetic Field Laboratory, TA-35, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
²  Physics Department, University of Oxford, The Clarendon Laboratory, Oxford OX1 3PU, UK
³  Department of Chemistry, Indiana State University, Bloomington, Indiana, USA

Abstract
We show that the coexistence of a quasi-two-dimensional Fermi-surface exhibiting Landau quantisation and a charge-density wave leads to a screening of electromagnetic fields at the sample surface. Hall potential experiments demonstrate that this screening is responsible for some of the unusual phenomena observed in the high-field CDW _x state of -(BEDT-TTF) ₂KHg(SCN) ₄.

© EDP Sciences 2004