Giant isotope effect on the itinerant-electron metamagnetism in YFe{sub 2}(H{sub y}D{sub 1-y}){sub 4.2}
- LCMTR, CNRS, 2 rue H. Dunant, 94320 Thiais Cedex (France)
- LCMI, CNRS-MPI, BP166, 38042 Grenoble Cedex 9 (France)
- IFP, T.U. Wien, Wiedner Haupstrasse 8-10, 1040 Vienna (Austria)
- LLB, CE-Saclay, 91191 Gif/Yvette (France)
The YFe{sub 2}(H{sub y}D{sub 1-y}){sub 4.2} compounds (y=0,0.64,1) crystallize in the same monoclinic structure with a linear increase of the cell volume reaching 0.80% between the hydride and the deuteride. These compounds undergo a first-order magnetovolumic transition from a ferromagnetic to an antiferromagnetic structure, which is related to an itinerant electron metamagnetism (IEM) transition of one of the Fe sites that is surrounded by about 5 (H, D) atoms. A large H/D isotope effect is observed on the magnetic properties: the hydride presents a larger spontaneous magnetization and a 50% higher transition temperature T{sub M0} than the deuteride. This large isotope effect is attributed to the large cell volume difference between the hydride and the deuteride, which plays a dominant role due to the strong interplay between magnetic and elastic energy in IEM compounds.
- OSTI ID:
- 20719788
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 72, Issue 17; Other Information: DOI: 10.1103/PhysRevB.72.174430; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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