期刊
PHYSICAL REVIEW LETTERS
卷 102, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.237202
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资金
- Carnegie- DOE Alliance Center (CDAC)
- U. S. Department of Energy (DOE)
- Stewardship Sciences Academic Alliance (SSAA)
- National Nuclear Security Administration (NNSA)
- Office of Basic Energy Sciences (BES) [DE-AC0206CH11357]
- National Science Foundation (NSF)
- DOE-BES [DE-AC02-98CH10886]
- Consortium for Materials Properties Research in Earth Sciences (COMPRES) of NSF
Synchrotron x-ray diffraction (XRD) measurements, nuclear forward scattering (NFS) measurements, and density functional theory (DFT) calculations were performed on L1(2)-ordered Pd3Fe. Measurements were performed at 300 K at pressures up to 33 GPa, and at 7 GPa at temperatures up to 650 K. The NFS revealed a collapse of the Fe-57 magnetic moment between 8.9 and 12.3 GPa at 300 K, coinciding with a transition in bulk modulus found by XRD. Heating the sample under a pressure of 7 GPa showed negligible thermal expansion from 300 to 523 K, demonstrating Invar behavior. Zero-temperature DFT calculations identified a ferromagnetic ground state and showed several antiferromagnetic states had comparable energies at pressures above 20 GPa.
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