μSR study of the quantum dynamics in the frustrated S = 3/2 kagome bilayers -: art. no. 187201

被引：38

作者：

Bono, D ^{[1
]}

Mendels, P

Collin, G

Blanchard, N

Bert, F

Amato, A

Baines, C

Hillier, AD

机构：

[1] Univ Paris 11, Phys Solides Lab, UMR 8502, F-91405 Orsay, France

[2] Ctr Etud Saclay, CEA, CNRS, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France

[3] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland

[4] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.93.187201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present muSR experiments in the S = 3/2 kagome bilayer compound Ba2Sn2ZnGa10-7pCr7pO22 [BSZCGO(p)] and compare it to the isostructural SrCr9pGa12-9pO19 [SCGO(p)], including for the latter new results for p greater than or equal to 0.89. Quantum-dynamical low energy magnetic excitations are evidenced in this novel compound. We study the evolution of the muon relaxation rate with p, T, and field. A phenomenological model for the muon relaxation based on sporadic dynamics due to spin excitations in a singlet sea proposed by Uemura et al. is extended to all fields and T range. Its connection to the RVB picture is discussed, and we argue that such coherent states might mediate the interactions between "impurities" which induce the spin glass freezing.

引用

页码：187201 / 1

页数：4

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