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Magnetic phase diagrams of the multicritical olivine Mn2SiS4 and Mn2GeS4
- Authors
- Chung, J. -H.; Ohgushi, K.; Ueda, Y.
- Issue Date
- 4월-2010
- Publisher
- ELSEVIER
- Keywords
- Multicriticality; Neutron scattering; Magnetic phase diagram
- Citation
- JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, v.322, no.7, pp.832 - 837
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
- Volume
- 322
- Number
- 7
- Start Page
- 832
- End Page
- 837
- ISSN
- 0304-8853
- Abstract
- Using single crystal neutron diffraction, we studied the H(parallel to b)-T phase diagram of the antiferromagnetic olivine Mn(2)AS(4) (A=Si; Ge). We identified the two spin-flop phases at high fields that are separated by field-independent phase boundaries terminated at multicritical points. In the low temperature phase, the magnetic structures consist of antiferromagnetic C-z-C-z' and ferromagnetic F-x' components. In the high temperature phase, incontrast, they are replaced by C-x-C-x' and F-z'. The absence of the anomalies in the DC magnetization data across the spin-reorientation transitions is discussed in terms of the Clausius-Clapeyron relation. (C) 2009 Elsevier B.V. All rights reserved.
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