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Anisotropic paramagnetism of monoclinic Nd2Ti2O7 single crystals

By Hui Xing, Gen Long, Hanjie Guo, Youming Zou, Chunmu Feng, Guanghan Cao, Hao Zeng and Zhu-An Xu

Abstract

The anisotropic paramagnetism and specific heat in Nd2Ti2O7 single crystals are investigated. Angular dependence of the magnetization and Weiss temperatures show the dominant role of the crystal field effect in the magnetization. By incorporating the results from the diluted samples, contributions to Weiss temperature from exchange interactions and crystal field interactions are isolated. The exchange interactions are found to be ferromagnetic, while the crystal field contributes a large negative part to the Weiss temperature, along all three crystallographic directions. The specific heat under magnetic field reveals a two-level Schottky ground state scheme, due to the Zeeman splitting of the ground state doublet, and the g-factors are thus determined. These observations provide solid foundations for further investigations of Nd2Ti2O7.Comment: 15 pages, 4 figures, 1 table. To appear in J. Phys.: Condens. Matte

Topics: Condensed Matter - Materials Science, Condensed Matter - Other Condensed Matter
Year: 2011
DOI identifier: 10.1088/0953-8984/23/21/216005
OAI identifier: oai:arXiv.org:1104.4697
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