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Title: Magnetic ordering at anomalously high temperatures in Dy at extreme pressures

In an attempt to destabilize the magnetic state of the heavy lanthanide Dy, extreme pressures were applied in an electrical resistivity measurement to 157 GPa over the temperature range 1.3 - 295 K. The magnetic ordering temperature To and spin-disorder resistance Rsd of Dy, as well as the superconducting pair-breaking effect ΔTc in Y(1 at.% Dy), are found to track each other in a highly non-monotonic fashion as a function of pressure. Above 73 GPa, the critical pressure for a 6% volume collapse in Dy, all three quantities increase sharply (dTo=dP≃5.3 K/GPa), To appearing to rise above ambient temperature for P > 107 GPa. In contrast, To and ΔTc for Gd and Y(0.5 at.% Gd), respectively, show no such sharp increase with pressure (dTo=dP≃ 0.73 K/GPa). Altogether, these results suggest that extreme pressure transports Dy into an unconventional magnetic state with an anomalously high magnetic ordering temperature.
Authors:
 [1] ;  [2] ;  [3] ;  [1]
  1. Washington Univ., St. Louis, MO (United States)
  2. Washington Univ., St. Louis, MO (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
OSTI Identifier:
1335454
Grant/Contract Number:
NA0002006
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 4; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY