Angle-dependent magnetoresistance oscillations due to magnetic breakdown orbits

A. Ardavan; A. F. Bangura; A. I. Coldea; J. A. Schlueter; J. Singleton; P. A. Goddard; R. D. McDonald; S. J. Blundell; S. W. Tozer

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Angle-dependent magnetoresistance oscillations due to magnetic breakdown orbits

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arxiv cond-mat/0702570 v2 pith:RFX2HAKE submitted 2007-02-24 cond-mat.str-el cond-mat.supr-con

A. F. Bangura , P. A. Goddard , J. Singleton , S. W. Tozer , A. I. Coldea , A. Ardavan , R. D. McDonald , S. J. Blundell

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J. A. Schlueter

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classification cond-mat.str-elcond-mat.supr-con

keywords magneticbreakdownoscillationsangle-dependentmagnetoresistanceadditionambientbedt-ttf

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abstract

We present experimental evidence for a hitherto unconfirmed type of angle-dependent magnetoresistance oscillation caused by magnetic breakdown. The effect was observed in the organic superconductor kappa-(BEDT-TTF)$_2$Cu(NCS)$_2$ using hydrostatic pressures of up to 9.8 kbar and magnetic fields of up to 33 T. In addition, we show that similar oscillations are revealed in ambient pressure measurements, provided that the Shubnikov-de Haas oscillations are suppressed either by elevated temperatures or filtering of the data. These results provide a compelling validation of Pippard's semiclassical picture of magnetic breakdown.

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