NONTRIVIAL MAGNETIC ORDER IN URU2SI2

被引：47

作者：

MASON, TE

BUYERS, WJL

PETERSEN, T

MENOVSKY, AA

GARRETT, JD

机构：

[1] RISO NATL LAB, DEPT SOLID STATE PHYS, DK-4000 ROSKILDE, DENMARK

[2] AECL RES, CHALK RIVER LABS, CHALK RIVER, ON K0J 1J0, CANADA

[3] UNIV BRITISH COLUMBIA, DEPT PHYS, VANCOUVER, BC V6T 1Z1, CANADA

[4] UNIV AMSTERDAM, NAT KUNDIG LAB, 1018 XE AMSTERDAM, NETHERLANDS

[5] MCMASTER UNIV, INST MAT RES, HAMILTON, ON L8S 4M1, CANADA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1995年 / 7卷 / 26期

关键词：

D O I：

10.1088/0953-8984/7/26/014

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have searched for the hidden multispin order parameters that have been proposed to explain the weak ordered moment observed in the heavy-fermion superconductor URu2Si2. Since the exotic spin order is predicted to cause broken-symmetry Bragg peaks that develop rapidly with applied magnetic field, we have measured their strength in fields up to 8 T, for which a large easily observable moment is predicted. The Bragg neutron scattering is found to decrease rather than increase when a field is applied along the easy tetragonal c-axis, while there is no change for a field at right angles. The results rule out the proposed symmetric multispin order parameters. The zero-field transition is found to exhibit critical softening of the spin gap and a cusp in the susceptibility at T-N, as expected for the ordering of magnetic dipoles.

引用

页码：5089 / 5096

页数：8