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\(S = {1 \over 2}\) quantum critical spin ladders produced by orbital ordering in \(Ba_2CuTeO_6\)

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) \(S = {1 \over 2}\) quantum critical spin ladders produced by orbital ordering in \(Ba_2CuTeO_6\). Physical Review B, 95 (10). Article Number 104428. ISSN 2469-9950. E-ISSN 2469-9969. (doi:10.1103/PhysRevB.95.104428) (KAR id:61567)

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https://doi.org/10.1103/PhysRevB.95.104428

Abstract

The ordered hexagonal perovskite \(Ba_2CuTeO_6\) hosts weakly coupled \(S = {1 \over 2}\) spin ladders produced by an orbital ordering of \(Cu^{2+}\). The magnetic susceptibility χ(T) of \(Ba_2CuTeO_6\) 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 \(T_{mag}=16K\). 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 \(T_{mag}\). The marginal magnetic transition, indicative of strong quantum fluctuations, is evidence that \(Ba_2CuTeO_6\) 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: Divisions > Division of Natural Sciences > School of Physical Sciences
Depositing User: Paul Saines
Date Deposited: 27 Apr 2017 08:01 UTC
Last Modified: 16 Feb 2021 13:45 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/61567 (The current URI for this page, for reference purposes)
Saines, P.J.: https://orcid.org/0000-0002-4207-2112
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