標題: Weak ferrimagnetism and multiple magnetization reversal in alpha-Cr-3(PO4)(2)
作者: Vasiliev, A. N.
Volkova, O. S.
Hammer, E.
Glaum, R.
Broto, J. -M.
Millot, M.
Nenert, G.
Liu, Y. T.
Lin, J. -Y.
Klingeler, R.
Abdel-Hafiez, M.
Krupskaya, Y.
Wolter, A. U. B.
Buechner, B.
物理研究所
Institute of Physics
公開日期: 18-Jan-2012
摘要: The chromium(II) orthophosphate alpha-Cr-3(PO4)(2) is a weak ferrimagnet with the Curie temperature T-C = 29 K confirmed by a lambda-type peak in specific heat. Dominant antiferromagnetic interactions in this system are characterized by the Weiss temperature Theta = 96 K, indicating an intermediate frustration ratio vertical bar Theta vertical bar/T-C similar to 3. In its magnetically ordered states alpha-Cr-3(PO4)(2) exhibits a remarkable sequence of temperature-induced magnetization reversals sensitive to the protocol of measurements, i.e., either field-cooled or zero-field-cooled regimes. The reduction of the effective magnetic moment 4.5 mu(B)/Cr2+, as compared to the spin-only moment 4.9 mu(B)/Cr2+, cannot be ascribed to the occurrence of the low-spin state in any crystallographic site of the Jahn-Teller active 3d(4) Cr2+ ions. X-ray absorption spectra at the K edge indicate divalent chromium and unravel the high-spin state of these ions at the L-2,L-3 edges. Weak ferrimagnetism and multiple magnetization reversal phenomena seen in this compound could be ascribed to incomplete cancellation and distortion of partial spontaneous magnetization functions of Cr2+ in its six crystallographically inequivalent positions.
URI: http://dx.doi.org/10.1103/PhysRevB.85.014415
http://hdl.handle.net/11536/150449
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.85.014415
期刊: PHYSICAL REVIEW B
Volume: 85
Issue: 1
起始頁: 0
結束頁: 0
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