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Condensed Matter > Mesoscale and Nanoscale Physics

arXiv:1802.02969 (cond-mat)
[Submitted on 8 Feb 2018]

Title:Negative longitudinal magnetoresistance in the density wave phase of Y$_2$Ir$_2$O$_7$

Authors:Abhishek Juyal, Amit Agarwal, Soumik Mukhopadhyay
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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$_7$.
Comments: To appear in Phys. Rev. Lett
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Strongly Correlated Electrons (cond-mat.str-el)
Cite as: arXiv:1802.02969 [cond-mat.mes-hall]
  (or arXiv:1802.02969v1 [cond-mat.mes-hall] for this version)
  https://doi.org/10.48550/arXiv.1802.02969
Related DOI: https://doi.org/10.1103/PhysRevLett.120.096801

Submission history

From: Amit Agarwal [view email]
[v1] Thu, 8 Feb 2018 17:22:22 UTC (1,132 KB)
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