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Title: Magnetic structure and magnetocalorics of GdPO4

The magnetic ordering structure of GdPO4 is determined at T = 60 mK by diffraction of hot neutrons with wavelength = 0.4696 Å. It corresponds to a non-collinear antiferromagnetic arrangement of the Gd moments with propagation vector k = (1/2, 0, 1/2). This arrangement is found to minimize the dipole-dipole interaction and the crystal field anisotropy energy, the magnetic superexchange being much smaller. The intensity of the magnetic reflections decreases with increasing temperature and vanishes at T ≈ 0.8 K, in agreement with the magnetic ordering temperature TN = 0.77 K, as reported in previous works based on heat capacity and magnetic susceptibility measurements. The magnetocaloric parameters have been determined from heat capacity data at constant applied fields up to 7 T, as well as from isothermal magnetization data. Lastly, the magnetocaloric effect, for a field change ΔB = 0 – 7T, reaches –ΔST = 375.8mJ / cm3K–1 at T = 2.1 K, largely exceeding the maximum values reported to date for Gd-based magnetic refrigerants.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [4] ;  [5] ;  [6]
  1. CSIC - Univ. of Zaragoza, Zaragoza (Spain)
  2. CSIC - Univ. of Zaragoza, Zaragoza (Spain); Institut Laue-Langevin (ILL), Grenoble (France)
  3. Institut Laue-Langevin (ILL), Grenoble (France); Australian Nuclear Science and Technology Organization, Lucas Heights, NSW (Australia)
  4. Rutherford Appleton Lab., Didcot (United Kingdom); Delft Univ. of Technology, Delft (The Netherlands)
  5. Leiden Univ., Leiden (The Netherlands)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 90; Journal Issue: 21; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1286793
Alternate Identifier(s):
OSTI ID: 1180469