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S= 12 quantum critical spin ladders produced by orbital ordering in Ba2CuTeO6
A. Gibbs S., A. Yamamoto, A. Yaresko N., K. Knight S., H. Yasuoka, , M. Baenitz, P. Saines J., J. Hester R., D. HashizumeShow More
Published in
Volume: 95
Issue: 10
The ordered hexagonal perovskite Ba2CuTeO6 hosts weakly coupled S=12 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≈86K but shows a deviation from the expected thermally activated behavior at low temperatures below T∗≈25K. An anomaly in $\chi$(T), indicative of magnetic ordering, is observed at Tmag=16K. No clear signature of long-range ordering, however, is captured so far in NMR 1/T1, 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.
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