Magnetic structure and magnetocalorics of
- CSIC - Univ. of Zaragoza, Zaragoza (Spain)
- CSIC - Univ. of Zaragoza, Zaragoza (Spain); Institut Laue-Langevin (ILL), Grenoble (France)
- Institut Laue-Langevin (ILL), Grenoble (France); Australian Nuclear Science and Technology Organization, Lucas Heights, NSW (Australia)
- Rutherford Appleton Lab., Didcot (United Kingdom); Delft Univ. of Technology, Delft (The Netherlands)
- Leiden Univ., Leiden (The Netherlands)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1286793
- Alternate ID(s):
- OSTI ID: 1180469
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 21; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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