Correlation of crystal quality and extreme magnetoresistance of WTe2

Mazhar N. Ali, Leslie Schoop, Jun Xiong, Steven Flynn, Quinn Gibson, Max Hirschberger, N. P. Ong, R. J. Cava

Research output: Contribution to journalArticle

60 Scopus citations

Abstract

High-quality single crystals of WTe2 were grown using a Te flux followed by a cleaning step involving self-vapor transport. The method is reproducible and yields consistently higher-quality single crystals than are typically obtained via halide-assisted vapor transport methods. Magnetoresistance (MR) values at 9 tesla and 2 kelvin as high as 1.75 million %, nearly an order of magnitude higher than previously reported for this material, were obtained on crystals with residual resistivity ratio (RRR) of approximately 1250. The MR follows a near B 2 law and, assuming a semiclassical model, the average carrier mobility for the highest-quality crystal was found to be at 2 K. A correlation of RRR, MR ratio and average carrier mobility is found with the cooling rate during the flux growth.

Original languageEnglish (US)
Article number67002
JournalEPL
Volume110
Issue number6
DOIs
StatePublished - Jun 1 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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