# $$S = {1 \over 2}$$ 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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## 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 10.1103/PhysRevB.95.104428 antiferromagnetism; perovskite; nuclear magnetic resonance; specific heat measurements; spin ladders; susceptibility measurements Q Science Divisions > Division of Natural Sciences > School of Physical Sciences Paul Saines 27 Apr 2017 08:01 UTC 16 Feb 2021 13:45 UTC https://kar.kent.ac.uk/id/eprint/61567 (The current URI for this page, for reference purposes) https://orcid.org/0000-0002-4207-2112