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V. Paul-Boncour, M. Guillot, G. Wiesinger, G. André:
"Giant isotope effect on the itinerant-electron metamagnetism in YFe₂(H_yD_1-y)_4.2";
Physical Review B, 72 (2005), S. 174430-1 - 174430-8.

Giant isotope effect on the itinerant-electron metamagnetism in YFe₂(H_yD_1-y)_4.2

V. Paul-Boncour,1 M. Guillot,2 G. Wiesinger,3 and G. André,4

1 LCMTR, CNRS, 2 rue H. Dunant, 94320 Thiais Cedex, France
2 LCMI, CNRS-MPI, BP166, 38042 Grenoble Cedex 9, France
3 IFP, T.U. Wien, Wiedner Haupstrasse 8-10, 1040 Vienna, Austria
4 LLB, CE-Saclay, 91191 Gif/Yvette, France

(Received 1 July 2005; revised 25 August 2005; published 30 November 2005)

The YFe₂(H_yD_1-y)_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_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.

©2005 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v72/e174430

doi:10.1103/PhysRevB.72.174430

PACS: 75.50.Bb, 76.50.+g, 76.80.+y, 61.12.Ld

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05938078

http://dx.doi.org/10.1103/PhysRevB.72.174430