2018/02/08 by Abhishek Juyal, Amit Agarwal, Soumik Mukhopadhyay
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Charge density wave #Condensed matter physics #Field (mathematics) #Magnetic field #Magnetoresistance #Nuclear materials and radiation effects #Phase (matter) #Physics #Pyrochlore #Quantum mechanics #Superconductivity #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.120.096801
To appear in Phys. Rev. Lett
arxiv created 2018/02/08 · openalex created_date 2018/02/23 · openalex publication_date 2018/02/27 · arxiv updated 2018/04/04 · openalex updated_date 2026/08/05
The ground state of nanowires of single-crystalline pyrochlore Y2Ir2O7 is a density wave. The application of a transverse magnetic field increases the threshold electric field for the collective depinning of the density wave state at a low temperature, leading to colossal magnetoresistance for voltages around the depinning threshold. This is in striking contrast to the case where even a vanishingly small longitudinal magnetic field sharply reduces the depinning threshold voltage, resulting in 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 Y2Ir2O7.