Unusual magnetic behavior in Gd-5(Si1.5Ge2.5) and Gd-5(Si2Ge2)

Authors
Levin, EM Pecharsky, VK Gschneidner, KA
Citation
Em. Levin et al., Unusual magnetic behavior in Gd-5(Si1.5Ge2.5) and Gd-5(Si2Ge2), PHYS REV B, 62(22), 2000, pp. R14625-R14628
Citations number
21
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
62
Issue
22
Year of publication
2000
Pages
R14625 - R14628
Database
ISI
SICI code
0163-1829(200012)62:22<R14625:UMBIGA>2.0.ZU;2-Y
Abstract
The coexistence of ferromagnetic: and paramagnetic phases in the 4f-electro n systems Gd-5(S1.5Ge2.5) and Gd-5(Si2Ge2) during the magnetic-martensitic phase transition have been observed. A de magnetic field reversibly changes both the magnetic and crystal structures of the alloys above their respect ive Curie temperatures. A negative imaginary component of the uc magnetic s usceptibility for both alloys has been observed in the ferromagnetic state. The results are discussed in terms of indirect Ruderman-Kittel-Kasuya-Yosi da and direct superexchange interactions, and anomalies of the relaxation p rocess.