μSR-detection of the soft-mode toward the exotic magnetic ground state in bond-disordered quantum spin system IPA-Cu(Cl${}_{0.35}$Br${}_{0.65}$)${}_3$

Abstract

The spin-gap system with a bond-disorder (CH3)2CHNH3-Cu(ClxBr1-x)3 is reported by experiments on macroscopic quantities of the uniform susceptibility and the specific heat to show a magnetic order at low temperatures when the value of x is within the limited region between 0.44 and 0.87, and otherwise a gapped behavior. We have investigated microscopically the ground state of the sample with x=0.35 by muon spin relaxation (mSR) to observe that the frequency spectrum of the spin fluctuation tends to concentrate around zero energy as lowering temperatures. This behavior was interpreted as the soft-mode toward the possible magnetic phase transition at absolute zero.

arXiv comment19 pages, 4 figures, accepted as a publication in PRB

References in corpus (14)

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• Density Matrix Renormalization Group Study of the Haldane Phase in Random One-Dimensional Antiferromagnets
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• The effect of randomness on the quantum spin system Tl${}_{1-x}$K${}_x$CuCl${}_3$ with ${\boldmath $x$}$ = 0.44 studied by the Zero-field Muon-Spin-Relaxation (ZF-$\mu$SR) method
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• Pressure-induced new magnetic phase in Tl(Cu${}_{0.985}$Mg${}_{0.015}$)Cl${}_3$ probed by muon spin rotation
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