Magnetic-field- and pressure-induced quantum phase transition in CsFeCl${}_3$ proved via magnetization measurement

Abstract

We have performed magnetization measurements of the gapped quantum magnet CsFeCl${}_3$ at temperatures ($T$) down to 0.5\,K at ambient pressure and down to 1.8\,K at hydrostatic pressures ($P$) of up to 1.5\,GPa. The lower-field ($H$) phase boundary of the field-induced ordered phase at ambient pressure is found to follow the power-law behavior expressed by the formula $H_{\mathrm{N}}(T)$\,$-$\,$H_{\mathrm{c}}$\,$\propto$\,$T_{\mathrm{N}}^{\varphi }$. The application of pressure extends the phase boundary to both a lower field and higher temperature. Above the critical pressure $P_{\mathrm{c}}$\,$\sim$\,0.9\,GPa, the transition field $H_{\mathrm{N}}$ associated with the excitation gap becomes zero, and a signature of the magnetic phase transition is found in the $T$-dependence of magnetization in a very low applied field. This suggests that CsFeCl${}_3$ exhibits a pressure-induced magnetic phase transition at $P_{\mathrm{c}}$.

8 pages, 8 figures, to appear in Phys. Rev. B

References in corpus (8)

• Amplitude / Higgs Modes in Condensed Matter Physics
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• Dimensional reduction at a quantum critical point
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• Pressure-Induced Magnetic Quantum Phase Transition in Gapped Spin System KCuCl3
• Softening of Magnetic Excitations Leading to Pressure-Induced Quantum Phase Transition in Gapped Spin System KCuCl${}_3$
• Pressure-Induced Reentrant Oblique Antiferromagnetic Phase in Spin Dimer System TlCuCl_3

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