Magnetic dilution in the geometrically frustrated SrCr9pGa12-9pO19 and the role of local dynamics:: A muon spin relaxation study

被引：55

作者：

Keren, A ^{[1
]}

Uemura, YJ

Luke, G

Mendels, P

Mekata, M

Asano, T

机构：

[1] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[2] Columbia Univ, Dept Phys, New York, NY 10027 USA

[3] McMaster Univ, Dept Phys & Astron, W Hamilton, ON L8P 4M1, Canada

[4] Univ Paris Sud, URA2 CNRS, Phys Solides Lab, F-91405 Orsay, France

[5] Fukui Univ, Dept Appl Phys, Fukui 910, Japan

[6] Kyushu Univ, Dept Phys, Fukuoka 8128581, Japan

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.84.3450

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the spin dynamics of SrCr9pGa12-9pO19 for p below and above the percolation threshold p(c) using muon spin relaxation. Our major findings are as follows: (i) At T --> 0 the relaxation rate is T independent and proportional to p(3), (ii) the slowing down of spin fluctuation is activated with an energy U, which is also a linear function of p(3) and lim(p-->0) U = 8 K; this energy scale could stem only From a single ion anisotropy, and (iii) the p dependence of the dynamical properties is identical below and above p(c), indicating that they are controlled by local excitation.

引用

页码：3450 / 3453

页数：4

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