Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 506, Issue 1, Pages 27-32Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.07.004
Keywords
Rhodium oxide; Antiferromagnetism; Rare-earth ion; Metamagnetic transition; Superexchange interaction
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Funding
- High-Tech Research Center
- Ministry of Education, Culture, Sports, Science and Technology (MEXIT) of the Japanese Government
- National Science Council of ROC [NSC 98-2112-M-005-007-MY3]
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The crystallographic and magnetic properties of perovskite-type rhodite LnRhO(3) (Ln = rare-earth ions except Ce and Pm) were studied. LnRhO(3) (Ln = La, Eu, Lu) shows paramagnetism with very small susceptibility, suggesting that the Rh3+ ion has no magnetic moment. LnRhO(3) (Ln = Nd, Sm, Gd, Tb, Dy, Ho, Er, Yb) shows antiferromagnetic transition at temperatures between 0.5 and 3.5 K; however, no transition was observed for LnRhO(3) (Ln = Pr, Tm) down to 0.5K. The effective moment mu(eff) agrees with the theoretical moment of free rare-earth ions, indicating the dominant magnetic contribution of rare-earth ions. The Weiss temperature Theta has a strong correlation with the spin value of rare-earth ions, suggesting that the superexchange interaction is a dominant interaction in LnRhO(3). The magnetization of antiferromagnetic samples tends to be saturated above 20-30 kOe, but the moments at 70 kOe are far from the theoretical moments. Antiferromagnetic samples seem to have an intermediate state and require a more intense magnetic field to attain saturation. (c) 2010 Elsevier B.V. All rights reserved.
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