Low-temperature spin excitations in frustrated ZnCr2O4 probed by high-field thermal conductivity

被引：10

作者：

Zhou, H. D. ^{[1
,2
]}

Zhao, Z. Y. ^{[3
]}

Sun, X. F. ^{[3
]}

Nieto Suarez, M. ^{[4
]}

Rivas-Murias, B. ^{[4
]}

Tsurkan, V. ^{[5
,6
]}

Deisenhofer, J. ^{[5
]}

Zapf, V. S. ^{[7
]}

Rivadulla, F. ^{[4
]}

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA

[3] Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

[4] Ctr Invest Quim Biol & Mat Mol CIQUS, Santiago De Compostela 15782, Spain

[5] Univ Augsburg, Ctr Elect Correlat & Magnetism, D-86159 Augsburg, Germany

[6] Moldavian Acad Sci, Inst Appl Phys, MD-2028 Kishinev, Moldova

[7] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 17期

基金：

中国国家自然科学基金;

关键词：

RESONATING VALENCE BONDS; SUPERCONDUCTIVITY; ICE;

D O I：

10.1103/PhysRevB.87.174436

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetoelastic excitations of spin frustrated ZnCr2O4 are studied by the magnetic field dependence of the thermal conductivity k down to 50 mK. Above the first-order magnetostructural transition at T-N,T-S approximate to 12.5 K, spin fluctuations are strongly coupled to acoustic phonons, leading to a glasslike dependence of k(T), up to Theta(CW). In the symmetry broken phase below T-N,T-S, k shows a dominant magnetic contribution even at the lowest temperatures probed in this work. Application of a magnetic field above 2.5 T destabilizes the spin-bond structure, leading to a sudden increase and a nonconventional temperature dependence of the thermal conductivity. The possibility of the coexistence of gapped and gapless excitations in this magnetic phase is discussed.

引用

页数：4

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