Weak ferrimagnetism and multiple magnetization reversal in α-Cr 3 (PO 4 ) 2

A. N. Vasiliev*, O. S. Volkova, E. Hammer, R. Glaum, J. M. Broto, M. Millot, G. Nénert, Y. T. Liu, Jiunn-Yuan Lin, R. Klingeler, M. Abdel-Hafiez, Y. Krupskaya, A. U.B. Wolter, B. Büchner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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The chromium(II) orthophosphate α-Cr 3 (PO 4 ) 2 is a weak ferrimagnet with the Curie temperature T C = 29 K confirmed by a λ-type peak in specific heat. Dominant antiferromagnetic interactions in this system are characterized by the Weiss temperature Θ = 96 K, indicating an intermediate frustration ratio Θ/T C ∼ 3. In its magnetically ordered states α-Cr 3 (PO 4 ) 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 μ B / Cr2 + , as compared to the spin-only moment 4.9 μ B / Cr2 + , cannot be ascribed to the occurrence of the low-spin state in any crystallographic site of the Jahn-Teller active 3d4 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 2,3 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.

Original languageEnglish
Article number014415
Pages (from-to)1-7
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
StatePublished - 18 Jan 2012


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