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Title: Electrical transport properties of single-crystal CaB6,SrB6 , and BaB6

We measure the electrical resistivity and Hall effect of alkaline-earth-metal hexaboride single crystals as a function of temperature, hydrostatic pressure, and magnetic field. The transport properties vary weakly with the external parameters and are modeled in terms of intrinsic variable-valence defects. These defects can stay either in (1) delocalized shallow levels or in (2) localized levels resonant with the conduction band, which can be neutral or negatively charged. Satisfactory agreement is obtained for electronic transport properties in a broad temperature and pressure range, though fitting the magnetoresistance is less straightforward and a combination of various mechanisms is needed to explain the field and temperature dependences.
Authors:
 [1] ;  [2] ;  [3] ;  [2]
  1. Univ. of Zaragoza (Spain). Dept. of Condensed Material Physics, Inst. of Materials Science
  2. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  3. Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
Publication Date:
Report Number(s):
LA-UR-17-23575
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1702708
Grant/Contract Number:
AC52-06NA25396; FG02-98ER45707
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 12; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science
OSTI Identifier:
1392877
Alternate Identifier(s):
OSTI ID: 1326127