Elastoresistance is the relative change of a material’s resistance under strain. Its value depends on two contributions: one coming from changes in the sample’s geometry and another from changes of the electronic properties such as carrier densities or scatering rates. In common metals like copper, the geometric contribution dominates a temperature-independent elastoresistance with a value of about 2. In other materials, including Bi, changes in the electronic properties dominate. We find that WTe2 is a member of the second group exhibiting an elastoresistance as large as -20. Moreover, we discover that the magnetic field has a dramatic effect on the elastoresistance in WTe2, resulting in values of elastoresistance in applied magnetic field between -80 to 120. We present a detailed analysis of this phenomenon combining results from DFT calculations and quantum oscillation measurements. We conclude that such large magneto-elastoresistance can be realized in other semi-metals with crystal structures similar to WTe2.
*This work is supported by the US DOE, Basic Energy Sciences under Contract No. DE-AC02-07CH11358; Gordon and Betty Moore Foundation EPiQS Initiative (Grant No. GBMF4411). Peter P. Orth acknowledges support from Iowa State University Startup Funds.
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Presenters
Na Hyun Jo
Iowa State University
Iowa State University and Ames Laboratory
Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA
Department of Physics & Astronomy, Iowa State University
Department of Physics and Astronomy, Iowa State University
Department of physics and astronomy, Iowa State University/Ames Laboratory
Physics, Iowa State University/Ames Laboratory
Authors
Na Hyun Jo
Iowa State University
Iowa State University and Ames Laboratory
Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA
Department of Physics & Astronomy, Iowa State University
Department of Physics and Astronomy, Iowa State University
Department of physics and astronomy, Iowa State University/Ames Laboratory
Physics, Iowa State University/Ames Laboratory
Lin-Lin Wang
Ames Laboratory
Iowa State University
Peter P. Orth
Ames Laboratory, Iowa State University
Department of Physics and Astronomy, Iowa State University
Iowa State University, Ames IA
Physics and Astronomy, Iowa State University
Department of physics and astronomy, Iowa State University/Ames Laboratory
Gil Drachuck
Department of physics and astronomy, Iowa State University/Ames Laboratory
Sergey L. Bud'ko
Iowa State University
Ames Laboratory and Iowa State University, Ames, IA, USA
Department of Physics & Astronomy, Iowa State University
Department of Physics and Astronomy, Iowa State University
Department of physics and astronomy, Iowa State University/Ames Laboratory
Paul Canfield
Ames Laboratory and Dept. of Physics, Iowa State University
Ames Laboratory, U.S. DOE, Iowa State University, Ames, Iowa 50011, USA.
Ames Laboratory
Iowa State University
Department of Physics, Iowa State University, Ames Laboratory, Ames, Iowa 50011, USA
Ames Laboratory, Iowa State University
Ames Laboratory/Iowa State University
Iowa State University and Ames Laboratory
Ames Laboratory and Iowa State University, Ames, IA, USA
Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ.
Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA
Ames Lab & Dept of Physics and Astronomy, Iowa State University
Department of Physics & Astronomy, Iowa State University
Department of physics and astronomy, Iowa State University/Ames Laboratory
