Volume 33, Number 8, March II 1996
|Page(s)||647 - 652|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Anomalous low-temperature magnetic behaviour in DyRu2Si2 and DyRu2Ge2
Laboratoire de Magnétisme Louis Néel, CNRS, BP 166, 38042 Grenoble
Cédex 9, France
2 Instituto de Fisica, UFRGS - P.O. Box 15051, 91501-970 Porto Alegre, Brazil
3 Department of Physics, Faculty of Science, Yamaguchi University, Yamaguchi 753, Japan
Accepted: 25 January 1996
The body-centred tetragonal compounds DyRu2Si2 and order within a collinear modulated magnetic structure at and 22 K, respectively. Below , both compounds present a low-field low-temperature magnetic state which exhibits several non-conventional features. The most spectacular one is a double-peak structure in the temperature dependence of the specific heat, associated with a giant variation of the magnetic entropy. Other anomalous characteristics include an unexpected change of behaviour in the magnetization processes and an unusual variation of the resistivity in this temperature range. The nature of this low-temperature phase is a puzzle.
PACS: 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
© EDP Sciences, 1996
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