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Quantum criticality in the coupled two-leg spin ladder Ba2CuTeO6
Glamazda, A.,Choi, Y. S.,Do, S.-H.,Lee, S.,Lemmens, P.,Ponomaryov, A. N.,Zvyagin, S. A.,Wosnitza, J.,Sari, Dita Puspita,Watanabe, I.,Choi, K.-Y. American Physical Society 2017 Physical Review B Vol.95 No.18
<P>We report on zero-field muon spin rotation, electron-spin resonance, and polarized Raman scattering measurements of the coupled quantum spin ladder Ba2CuTeO6. Zero-field muon spin rotation and electron-spin resonance probes disclose a successive crossover from a paramagnetic through a spin-liquid-like into a magnetically ordered state with decreasing temperature. More significantly, the two-magnon Raman response obeys a T-linear scaling relation in its peak energy, linewidth, and intensity. This critical scaling behavior presents an experimental signature of proximity to a quantum-critical point from an ordered side in Ba2CuTeO6.</P>