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Title: Pressure effects in the itinerant antiferromagnetic metal TiAu

Here, we report the pressure dependence of the Néel temperature T N up to P ≈ 27 GPa for the recently discovered itinerant antiferromagnet (IAFM) TiAu. The T N(P) phase boundary exhibits unconventional behavior in which the Néel temperature is enhanced from T N ≈ 33 K at ambient pressure to a maximum of T N ≈ 35 K occurring at P ≈ 5.5 GPa. Upon a further increase in pressure, T N is monotonically suppressed to ~22 K at P ≈ 27 GPa. We also find a crossover in the temperature dependence of the electrical resistivity ρ in the antiferromagnetic (AFM) phase that is coincident with the peak in T N(P), such that the temperature dependence of ρ = ρ 0 + A nT n changes from n≈3 during the enhancement of T N to n ≈ 2 during the suppression of T N. Based on an extrapolation of the T N(P) data to a possible pressure-induced quantum critical point, we estimate the critical pressure to be P c ≈ 45 GPa.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [5] ;  [5] ;  [3] ;  [6] ;  [1]
  1. Univ. of California, San Diego, La Jolla, CA (United States)
  2. Univ. of California, San Diego, La Jolla, CA (United States); Vacuum Process Engineering, Sacramento, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Rice Univ., Houston, TX (United States); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  5. Rice Univ., Houston, TX (United States)
  6. Univ. of Alabama at Birmingham, Birmingham, AL (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-736297
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1702812
Grant/Contract Number:
NA0002909; AC52-07NA27344; NA0002928; 14-ERD-041
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 21; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Univ. of California, San Diego, La Jolla, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1377067
Alternate Identifier(s):
OSTI ID: 1361927; OSTI ID: 1438760