Appearance of beating in the shubnikov-de haas oscillations of the organic conductor κ-(BEDT-TTF)2Cu(NCS)2 under pressure

Abstract

We observed beats in the Shubnikov-de Haas oscillations of the interlayer magnetoresistance Rzz for the organic conductor κ-(BEDT-TTF) 2Cu(NCS)2 pressurized at 7 kbar. Direct observation of a beat pattern is an evidence of coherence in interlayer electron transport. From the beat frequency, the amplitude of the interlayer dispersion, t =E F, was estimated to be 1/250 which doubles the previous estimation from the coherence peak at ambient pressure. In the Fourier transformation spectrum, the frequency splits in the α- and β-oscillations gave t for both orbits as 0:17 ± 0:01 meV. © 2010 The Physical Society of Japan.