Angular Study of the Magnetic Breakdown Effect in the Organic Conductor k- (BEDT-TTF)2Cu (NCS)2 at High Magnetic Field
Abstract
Measurements were made of the in-plane resistivity in the organic conductor κ-(BEDT-TTF)_2Cu(NCS)2 using a radio frequency (rf) tank circuit ( 50MHz) at high magnetic field ( 50T-60T) and low temperature (500mK). In-plane resistivity measurements show much more dominant breakdown frequencies as compared to conventional 4-lead transport experiments. This aspect is not well understood but similar results were seen in microwave experiments ^1. The angular dependence of the Shubnikov-de Haas frequencies is reported up to 25 degrees and the expected 1/cos(θ)behavior is found. The amplitudes of the magnetic breakdown frequencies as a function of angle agree with calculations using the semi-classical theory (LK-formula).This suggests that the tunneling probabilities are not a function of angle at least up to 25 degrees. ^1 S. Hill, S. Uji, P. S. Sandhu, J. S. Brooks, and L. Seger, "A comparison of the high field quantum oscillations observed by electrodynamic and dc transport techniques in teh organic superconductor κ-(BEDT-TTF)_2Cu(NCS)2 ," Synthetic Metals 86, 1955 (1997).
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2002
- Bibcode:
- 2002APS..MARB11004M