Evolution of magnetic and orbital properties in the magnetically diluted A-site spinel Cu1–xZnxRh2O4

Zakrzewski, A. V.; Gangopadhyay, S.; MacDougall, Gregory J.; Aczel, Adam A.; Calder, Stuart A.; Williams, Travis J.

doi:10.1103/PhysRevB.97.214411

Title: Evolution of magnetic and orbital properties in the magnetically diluted $A$ -site spinel ${Cu}_{1 - x} {Zn}_{x} {Rh}_{2} O_{4}$

Journal Article · Mon Jun 11 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.214411· OSTI ID:1484133

Zakrzewski, A. V. ^[1]; Gangopadhyay, S. ^[1]; MacDougall, Gregory J. ^[1];

^[2];

^[2]

Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In frustrated spinel antiferromagnets, dilution with nonmagnetic ions can be a powerful strategy for probing unconventional spin states or uncovering interesting phenomena. Here, we present x-ray, neutron scattering, and thermodynamic studies of the effects of magnetic dilution of the tetragonally distorted A-site spinel antiferromagnet, CuRh₂O₄, with nonmagnetic Zn²⁺ ions. Our data confirm the helical spin order recently identified at low temperatures in this material, and further demonstrate a systematic suppression of the associated Néel temperature with increasing site dilution towards a continuous transition with critical doping of x_spin ~0.44. Interestingly, this critical doping is demonstrably distinct from a second structural critical point at x_JT ~0.6, which is consistent with the suppression of orbital order on the A site through a classical percolative mechanism. In conclusion, this anomalously low value for x_spin is confirmed via multiple measurements, and is inconsistent with predictions of classical percolation theory, suggesting that the spin transition in this material is driven by an enhancement of preexisting spin fluctuations with weak dilution.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1484133

Alternate ID(s):: OSTI ID: 1441121

Journal Information:: Physical Review B, Vol. 97, Issue 21; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: Evolution of magnetic and orbital properties in the magnetically diluted $A$ -site spinel ${Cu}_{1 - x} {Zn}_{x} {Rh}_{2} O_{4}$