Muon spin relaxation and rotation study on the solid solution of the two spin-gap systems (CH3)2CHNH3-CuCl3 and (CH3)2CHNH3-CuBr3

T. Saito; A. Oosawa; T. Goto; T. Suzuki; I. Watanabe

doi:10.1103/PhysRevB.74.134423

Muon spin relaxation and rotation study on the solid solution of the two spin-gap systems (CH3)2CHNH3-CuCl3 and (CH3)2CHNH3-CuBr3

Strongly Correlated Electrons 2009-11-11 v2

Authors: T. Saito , A. Oosawa , T. Goto , T. Suzuki , I. Watanabe

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Abstract

Muon-spin-rotation and relaxation studies have been performed on (CH $_3$ ) $_2$ CHNH $_3$ Cu(Cl $_x$ Br $_{1-x}$ ) $_3$ with $x$ =0.85 and 0.95, which are solid solutions of the two isomorphic spin-gap systems (CH $_3$ ) $_2$ CHNH $_3$ CuCl $_3$ and (CH $_3$ ) $_2$ CHNH $_3$ CuBr $_3$ with different spin gaps. The sample with $x$ =0.85 showed a clear muon spin rotation under zero-field below $T_{\rm N}$ =11.65K, indicating the existence of a long-range antiferromagnetic order. A critical exponent of the hyperfine field was obtained to be $\beta$ =0.33, which agrees with 3D-Ising model. In the other sample with $x$ =0.95, an anomalous enhancement of the muon spin relaxation was observed at very low temperatures indicating a critical slowing down due to a magnetic instability of the ground state.

Keywords

muon spin relaxation spin gap solid solution antiferromagnetic order critical exponent

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@article{arxiv.cond-mat/0604466,
  title  = {Muon spin relaxation and rotation study on the solid solution of the two spin-gap systems (CH3)2CHNH3-CuCl3 and (CH3)2CHNH3-CuBr3},
  author = {T. Saito and A. Oosawa and T. Goto and T. Suzuki and I. Watanabe},
  journal= {arXiv preprint arXiv:cond-mat/0604466},
  year   = {2009}
}

Muon spin relaxation and rotation study on the solid solution of the two spin-gap systems (CH3)2CHNH3-CuCl3 and (CH3)2CHNH3-CuBr3

Abstract

Keywords

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