Pressure-Induced Magnetic Quantum Phase Transition in Gapped Spin System KCuCl3

Abstract

Magnetization and neutron elastic scattering measurements under a hydrostatic pressure were performed on KCuCl3, which is a three-dimensionally coupled spin dimer system with a gapped ground state. It was found that an intradimer interaction decreases with increasing pressure, while the sum of interdimer interactions increases. This leads to the shrinkage of spin gap. A quantum phase transition from a gapped state to an antiferromagnetic state occurs at Pc ? 8.2 kbar. For P > P c, magnetic Bragg reflections were observed at reciprocal lattice points equivalent to those for the lowest magnetic excitation at zero pressure. This confirms that the spin gap decreases and closes under applied pressure.

7 pages, 10 figures, submitted to J. Phys. Soc. Jpn

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• Consequences of spin-orbit coupling for the Bose-Einstein condensation of magnons
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• Pressure-Induced Successive Magnetic Phase Transitions in the Spin Gap System TlCuCl${}_3$
• Quantum Critical Point of the XY Model and Condensation of Field-Induced Quasiparticles in Dimer Compounds
• On the dynamics of coupled S=1/2 antiferromagnetic zig-zag chains

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• Magnetism of the antiferromagnetic spin-$\frac{1}{2}$ tetramer compound CuInVO${}_5$
• Quasi-two-dimensional Bose-Einstein condensation of spin triplets in dimerized quantum magnet Ba${}_2$CuSi${}_2$O${}_6$Cl${}_2$
• Softening of Magnetic Excitations Leading to Pressure-Induced Quantum Phase Transition in Gapped Spin System KCuCl${}_3$
• Magnetic excitations of the spin-1/2 tetramer substance Cu${}_2$${}^{114}$Cd${}^{11}$B${}_2$O${}_6$ obtained by inelastic neutron scattering experiments
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• High pressure Raman study of the quantum magnet (C${}_4$H${}_{12}$N${}_2$)Cu${}_2$Cl${}_6$
• 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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• Asymmetric phase diagram and dimensional crossover in a system of spin-1/2 dimers under applied hydrostatic pressure
• Pressure-Induced Reentrant Oblique Antiferromagnetic Phase in Spin Dimer System TlCuCl_3
• Pressure-tuned quantum criticality in the large-$D$ antiferromagnet DTN
• Quantum transition between magnetically ordered and Mott glass phases
• Magentic Ordering under Hydrostatic Pressure in Doped Spin Gap Systems ACu${}_{1-x}$Mg${}_x$Cl${}_3$: A$=$Tl and K