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Structural and electronic properties of the spin-filter material CrVTiAl with disorder

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5079749· OSTI ID:1529971
 [1];  [1];  [2];  [1];  [3];  [4];  [5];  [1];  [1];  [1]
  1. Northeastern Univ., Boston, MA (United States)
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; U. S. Naval Academy, Annapolis, MD (United States)
  3. Northeastern Univ., Boston, MA (United States); AGH - Univ. of Science and Technology, Krakow (Poland)
  4. Northeastern Univ., Boston, MA (United States); Lappeenranta Univ. of Technology (Finland)
  5. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
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The effects of chemical disorder on the electronic properties of the spin-filter material CrVTiAl are investigated experimentally and theoretically. Synchrotron X-ray diffraction experiments on bulk CrVTiAl and the associated Rietveld analysis indicate that the crystal structure consists primarily of a mixture of a partially ordered B2 phase, a fully disordered A2 phase, and a small component of an ordered L21 or Y phase. High temperature resistivity measurements confirm the existence of a bandgap. First-principles, all-electron, self-consistent electronic structure computations show that the chemically disordered A2 and B2 phases are metallic, while the spin-filter properties of the ideal Y-type phase are preserved in the presence of L21 disorder (Cr and V mixing). The Hall coefficient is found to decrease with increasing temperature, similar to the measured increase in the conductivity, indicating the presence of thermally activated semiconductor-like carriers.
Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231; FG02-07ER46352
OSTI ID:
1529971
Alternate ID(s):
OSTI ID: 1503374
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 12 Vol. 125; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Electrical and magnetic properties of thin films of the spin-filter material CrVTiAl journal June 2019
Electrical and magnetic properties of thin films of the spin-filter material CrVTiAl text January 2019

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36 MATERIALS SCIENCE