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S=12 quantum critical spin ladders produced by orbital ordering in Ba2CuTeO6

Gibbs, A.S., Yamamoto, A., Yaresko, A.N., Knight, K.S., Yasuoka, H., Majumder, M., Baenitz, M., Saines, P.J., Hester, J.R., Hashizume, D., and others. (2017) S=12 quantum critical spin ladders produced by orbital ordering in Ba2CuTeO6. Physical Review B, 95 (10). ISSN 2469-9950. E-ISSN 2469-9969. (doi:10.1103/PhysRevB.95.104428) (KAR id:61567)

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The ordered hexagonal perovskite Ba2CuTeO6 hosts weakly coupled S=12 spin ladders produced by an orbital ordering of Cu2+. The magnetic susceptibility χ(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 χ(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.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.95.104428
Uncontrolled keywords: antiferromagnetism; perovskite; nuclear magnetic resonance; specific heat measurements; spin ladders; susceptibility measurements
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Paul Saines
Date Deposited: 27 Apr 2017 08:01 UTC
Last Modified: 12 Jul 2019 14:44 UTC
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