High temperature spin-freezing transition in pyrochlore Eu2Ti2O7: A new observation from ac-susceptibility

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:462

Article

Pal, Arkadeb¹  Singh, Abhishek¹  Ghosh, A. K.²  Chatterjee, Sandip¹ 

[1] Banaras Hindu Univ, Indian Inst Technol, Dept Phys, Varanasi 221005, Uttar Pradesh, India

[2] Banaras Hindu Univ, Dept Phys, Varanasi 221005, Uttar Pradesh, India

关键词: Pyrochlore oxide;    Geometrical spin frustration;    Single ion anisotropy;    Spin freezing;   

DOI  :  10.1016/j.jmmm.2018.04.060

来源: Elsevier

【 摘 要 】

The magnetization (both dc and ac) of pyrochlore Eu2Ti2O7 have been investigated. Ac susceptibility (chi' & chi '') measurements reveal a new unusual spin freezing below 35 K for pure Eu2Ti2O7. Frequency dependence of these ac chi '' peak positions indicate slow spin relaxation near this temperature and it follows the Arrhenius formula suggesting a thermally activated relaxation process. The origin of this spin freezing has been attributed essentially to a single ion process which is associated to Eu3+ spin relaxation. Nonmagnetic dilution by Y3+ ions also confirms the single ion freezing. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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