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

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 $T_{\mathrm{N}}$=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.

References in corpus (5)

• Realization of Bose-Einstein condensation of dilute magnons in TlCuCl${}_3$
• Ising Universality in Three Dimensions: A Monte Carlo Study
• Dynamics of composite Haldane spin chains in IPA-CuCl3
• Random Bond Effect in the Quantum Spin System (Tl${}_{1-x}$K${}_x$)CuCl${}_3$
• Uniform Magnetic Order in a Ferromagnetic-Antiferromagnetic Random Alternating Quantum Spin Chain

Cited by in corpus (9)

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• Microscopic phase separation in triangular-lattice quantum spin magnet kappa-(BEDT-TTF)2Cu2(CN)3 probed by muon spin relaxation
• μSR-detection of the soft-mode toward the exotic magnetic ground state in bond-disordered quantum spin system IPA-Cu(Cl${}_{0.35}$Br${}_{0.65}$)${}_3$
• 1H-NMR Study on the Magnetic Order in the Mixture of Two Spin Gap Systems (CH3)2CHNH3CuCl3 and (CH3)2CHNH3CuBr3
• 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
• ${}^1$H-NMR Study of the Random Bond Effect in the Quantum Spin System (CH${}_3$)${}_2$CHNH${}_3$Cu(Cl${}_x$Br${}_{1-x}$)${}_3$
• Pressure-induced new magnetic phase in Tl(Cu${}_{0.985}$Mg${}_{0.015}$)Cl${}_3$ probed by muon spin rotation
• \muSR-dtected Soft mode toward a Possible Phase Transition in disordered spin gap system (CH3)2CHNH3-Cu(ClxBr1-x)3
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