Ferro- and antiferromagnetism in oxychalcogenides LnCrOX2 (Ln = La or Nd and X = S or Se) |
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Authors: | M. Wintenberger J. Dugue M. Guittard Nguyen Huy Dung Vo Van Tien |
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Abstract: | The two isomorphous compounds LaCrOS2 and LaCrOSe2 are ferromagnetic (Tc = 35 and 51 K, respectively). This implies ferromagnetic super-superexchange interactions. NdCrOS2 is antiferromagnetic (TN = 72 K) and undergoes a spin-flop transition (Hc = 54 KOe at 20 K). The study of the thermal variation of Cr3+ and Nd3+ magnetic moments below TN allows a rough estimate of the Cr---Nd and Cr---Cr exchange fields ratio (0.1). |
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