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Angle-dependent magnetoresistance oscillations due to magnetic breakdown orbits

2007; American Physical Society; Volume: 76; Issue: 5 Linguagem: Inglês

10.1103/physrevb.76.052510

1550-235X

A. F. Bangura, Paul Goddard, John Singleton, S. W. Tozer, A. I. Coldea, Arzhang Ardavan, R. McDonald, S. J. Blundell, John A. Schlueter,

Physics of Superconductivity and Magnetism

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 $\ensuremath{\kappa}\text{\ensuremath{-}}{(\mathrm{BEDT}\text{\ensuremath{-}}\mathrm{TTF})}_{2}\mathrm{Cu}{(\mathrm{NCS})}_{2}$ using hydrostatic pressures of up to $9.8\phantom{\rule{0.3em}{0ex}}\mathrm{kbar}$ and magnetic fields of up to $33\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. 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 [Philos. Trans. R. Soc. London, Ser. A 270, 1 (1962)].