Evidence from thermodynamic measurements for a singlet crystal-field ground state in pyrochlore Tb2Sn2O7 and Tb2Ti2O7

被引：39

作者：

Chapuis, Y. ^{[1
]}

Yaouanc, A. ^{[1
]}

de Reotier, P. Dalmas ^{[1
]}

Marin, C. ^{[1
]}

Vanishri, S. ^{[1
]}

Curnoe, S. H. ^{[2
]}

Vaju, C. ^{[1
,3
]}

Forget, A. ^{[4
]}

机构：

[1] CEA, DSM, Inst Nanosci & Cryogenie, F-38054 Grenoble, France

[2] Mem Univ, St John, NF A1B 3X7, Canada

[3] Ecole Polytech Fed Lausanne, Inst Phys Mat Condensee, CH-1015 Lausanne, Switzerland

[4] CEA, DSM, Inst Rayonnement Mat Saclay, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.82.100402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic entropy variation for the ordered spin-ice Tb2Sn2O7 and the spin-liquid Tb2Ti2O7 measured up to similar to 20 K shows that the crystal-field ground state for both systems is a singlet split from the first excited level by a thermal energy of similar to 2 K. It is the superexchange interactions between the Tb3+ spins which induce the terbium magnetic moments. Our results are analyzed in terms of a tetragonal perturbation for Tb2Ti2O7 and this perturbation plus a molecular field for Tb2Sn2O7.

引用

页数：4

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