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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 κ-(BEDT-TTF)₂Cu(NCS)₂ using hydrostatic pressures of up to 9.80.3em0exkbar and magnetic fields of up to 330.3em0exT. 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)].
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Bangura et al. (2007) studied this question.
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