Negative longitudinal magnetoresistance in the density wave phase of Y${}_2$Ir${}_2$O${}_7$

Abstract

The ground state of nanowires of single crystalline Pyrochlore Y${}_2$Ir${}_2$O${}_7$ is a density wave. Application of a {\it transverse} magnetic field increases the threshold electric field for the collective de-pinning of the density wave state at low temperature, leading to colossal magnetoresistance for voltages around the de-pinning threshold. This is in striking contrast to the case where even a vanishingly small {\it longitudinal} magnetic field sharply reduces the de-pinning threshold voltage resulting in {\it negative} magnetoresistance. Ruling out several other possibilities we argue that this phenomenon is likely to be a consequence of the chiral anomaly in the gapped out Weyl semimetal phase in Y${}_2$Ir${}_2$O${}_7$.

arXiv commentTo appear in Phys. Rev. Lett

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