Occurrence of weak ferromagnetism in T-(R1xYx)2CuO4 (R=Sm and Eu)

H. D. Yang, T. H. Meen, and Y. C. Chen
Phys. Rev. B 48, 7720 – Published 1 September 1993
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Abstract

Results for the temperature dependence of the magnetic susceptibility for Gd2CuO4, (Sm1xYx)2CuO4, and (Eu1xYx)2CuO4 with various Y concentrations are reported. The magnetic anomalies that occurred at TN(Cu)∼285 K and Tm∼20 K in Gd2CuO4, are not observed in Sm2CuO4 or Eu2CuO4, and are seen in (Sm1xYx)2CuO4 and (Eu1xYx)2CuO4 with x≥0.3 and x≥0.05, respectively. It is found that the transition temperatures TN(Cu) and Tm and the magnitudes of anomalies are very sensitive to Y substitution. Thus, the effect of small ionic radius for Gd plays a much more important role than its large moment on the anomalous magnetic properties of Gd2CuO4. This also provides clear evidence that the magnetic anomalies in Gd2CuO4 are due to weak ferromagnetism in the Cu-O plane resulting from the too small ionic radius of Gd, which induces a lattice distortion in the T structure.

  • Received 11 March 1993

DOI:https://doi.org/10.1103/PhysRevB.48.7720

©1993 American Physical Society

Authors & Affiliations

H. D. Yang

  • Department of Physics, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424, Republic of China

T. H. Meen and Y. C. Chen

  • Institute of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424, Republic of China

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Vol. 48, Iss. 10 — 1 September 1993

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