Magnetic ordering of Gd3+ and Sm3+ in the T and T* copper oxides and oxychlorides

Robert L. Fuller, Kandalam Ramanujachary, Martha Greenblatt

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3 Scopus citations

Abstract

The magnetic ordering of Sm3+ and Gd3+ moments in some T and T* copper oxides and oxychlorides has been studied. The temperature-dependent magnetic susceptibility of CaGdCuO3Cl and Sr0.1La0.9Gd0.9CuO4, both with T* structure, showed anomalies at 275 K and 150275 K, respectively, which are attributed to the antiferromagnetic ordering of the copper spins in each system. A comparison between the magnetic ordering of Gd3+ and Sm3+ in the oxychlorides revealed that the Gd3+ moments order at 6.1 K, while those of Sm3+ do not order down to 2 K. In contrast, both the parent T oxides Gd2CuO4 and Sm2CuO4 order at 6.66 and 5.95 K, respectively. A mechanism for superexchange involving the rare-earth f orbitals and the surrounding oxygen or copper orbitals is proposed based on crystal-field arguments to explain the observed differences in the magnetic ordering of the Gd3+ and Sm3+ moments.

Original languageEnglish (US)
Pages (from-to)1166-1171
Number of pages6
JournalPhysical Review B
Volume46
Issue number2
DOIs
StatePublished - Jan 1 1992
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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