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APS » Journals » Phys. Rev. B » Volume 58 » Issue 22
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Phys. Rev. B 58, R14721–R14724 (1998)

Magnetic-field-induced structural phase transition in Gd5(Si1.8Ge2.2)

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L. Morellon, P. A. Algarabel, M. R. Ibarra*, J. Blasco, and B. García-Landa
Departamento de Física de la Materia Condensada and Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza and Consejo Superior de Investigaciones Científicas, 50009 Zaragoza, Spain

Z. Arnold
Institute of Physics, Czech Academy of Science, Cukrovarnická 10, 162 00 Prague 6, Czech Republic

F. Albertini
Istituto di Materiali Speciali per Elettronica e Magnetismo del Consiglio Nazionalle delle Ricerche, via Chiavari 18/A, 43100 Parma, Italy

Received 17 September 1998; published in the issue dated 1 December 1998

We present direct evidence that the giant magnetocaloric effect recently discovered in the Gd5(Si1.8Ge2.2) alloy is associated with a field-induced first-order structural transition from a P1121/a monoclinic (paramagnetic) to a Pnma orthorhombic (ferromagnetic) structure. A large volume contraction of ΔV/V≅0.4% takes place spontaneously at the transition temperature, TC≅240K. The reported structural transition can be induced reversibly by application of an external magnetic field, producing strong magnetoelastic effects.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.58.R14721
DOI:
10.1103/PhysRevB.58.R14721
PACS:
75.30.Kz, 75.50.Cc, 75.80.+q

*Author to whom correspondence should be addressed. FAX: 34-976-761229; electronic address: ibarra@posta.unizar.es

 
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