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S=1/2 quantum critical spin ladders produced by orbital ordering in Ba2CuTeO6

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Yasuoka,  H.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Majumder,  M.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Baenitz,  M.
Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Gibbs, A. S., Yamamoto, A., Yaresko, A. N., Knight, K. S., Yasuoka, H., Majumder, M., et al. (2017). S=1/2 quantum critical spin ladders produced by orbital ordering in Ba2CuTeO6. Physical Review B, 95(10): 104428, pp. 1-6. doi:10.1103/PhysRevB.95.104428.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-3CEE-E
Abstract
The ordered hexagonal perovskite Ba2CuTeO6 hosts weakly coupled S = 1/2 spin ladders produced by an orbital ordering of Cu2+. The magnetic susceptibility chi(T) of Ba2CuTeO6 is well described by that expected for isolated spin ladders with exchange coupling of J approximate to 86 K but shows a deviation from the expected thermally activated behavior at low temperatures below T* approximate to 25 K. An anomaly in chi(T), indicative of magnetic ordering, is observed at T-mag = 16 K. No clear signature of long-range ordering, however, is captured so far in NMR 1/T-1, specific heat or neutron diffraction measurements at and below Tmag. The marginal magnetic transition, indicative of strong quantum fluctuations, is evidence that Ba2CuTeO6 is in very close proximity to a quantum critical point between magnetically ordered and spin-gapped phases controlled by interladder couplings.