Chemical Pressure Induced Spin Freezing Phase Transition in Kagome Pr Langasites

被引：22

作者：

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

Wiebe, C. R. ^{[1
,2
]}

Jo, Y. -J. ^{[2
]}

Balicas, L. ^{[2
]}

Urbano, R. R. ^{[2
]}

Lumata, L. L. ^{[1
,2
]}

Brooks, J. S. ^{[1
,2
]}

Kuhns, P. L. ^{[2
]}

Reyes, A. P. ^{[2
]}

Qiu, Y. ^{[3
,4
]}

Copley, J. R. D. ^{[3
]}

Gardner, J. S. ^{[3
,5
]}

机构：

[1] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

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

[3] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[4] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[5] Indiana Univ, Bloomington, IN 47408 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 06期

关键词：

LATTICE; MAGNETS; ICE;

D O I：

10.1103/PhysRevLett.102.067203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The 2D kagome system Pr(3)Ga(5)SiO(14) has been previously identified as a spin-liquid candidate in zero field, displaying no magnetic long-ranged order down to at least 35 mK. Perturbations upon such systems, either under applied fields or applied pressure, should induce a spin freezing phase transition, but there are very few experimental realizations of this phenomena other than the well-studied 3D pyrochlore Tb(2)Ti(2)O(7). In this Letter, we report the observation of a spin freezing phase transition in Pr(3)Ga(5)SiO(14) through the application of chemical pressure-that is, through a systematic substitution on the Si site with larger ions and an elongation of the nearest-neighbor Pr-Pr distance in the kagome lattice. This results in a suppression of the T(2) component of the heat capacity, and the reduction of the exchange constant eventually leads to dipolar-driven spin freezing.

引用

页数：4

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