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Title: ‘Hard’ crystalline lattice in the Weyl semimetal NbAs

Journal Article · · Journal of Physics. Condensed Matter
 [1];  [2];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

Here, we report the effect of hydrostatic pressure on the magnetotransport properties of the Weyl semimetal NbAs. Subtle changes can be seen in the ρxx(T) profiles with pressure up to 2.31 GPa. The Fermi surfaces undergo an anisotropic evolution under pressure: the extremal areas slightly increase in the kx-ky plane, but decrease in the kz-ky(kx) plane. The topological features of the two pockets observed at atmospheric pressure, however, remain unchanged at 2.31 GPa. No superconductivity can be seen down to 0.3 K for all the pressures measured. By fitting the temperature dependence of specific heat to the Debye model, we obtain a small Sommerfeld coefficient γ0=0.09(1) mJ (mol•K2)-1 and a large Debye temperature, θD=450(9) K, confirming a 'hard' crystalline lattice that is stable under pressure. We also studied the Kadowaki–Woods ratio of this low-carrier-density massless system, RKW=3.2 x 104 μΩ cm mol2 K2 J-2. After we account for the small carrier density in NbAs, this RKW indicates a suppressed transport scattering rate relative to other metals.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1249050
Report Number(s):
LA-UR-15-28700
Journal Information:
Journal of Physics. Condensed Matter, Vol. 28, Issue 5; ISSN 0953-8984
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (7)

Crystal growth of Dirac semimetal ZrSiS with high magnetoresistance and mobility journal January 2017
Directly photoexcited Dirac and Weyl fermions in ZrSiS and NbAs journal November 2018
Orbital effect and weak localization in the longitudinal magnetoresistance of Weyl semimetals NbP, NbAs, TaP, and TaAs journal March 2020
Inducing superconductivity in Weyl semimetal microstructures by selective ion sputtering journal May 2017
Coexistence of Weyl Physics and Planar Defects in Semimetals TaP and TaAs text January 2016
Inducing superconductivity in Weyl semi-metal microstructures by selective ion sputtering text January 2017
Orbital effect and weak localization physics in the longitudinal magnetoresistance of the Weyl semimetals NbP, NbAs, TaP and TaAs text January 2019

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