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Anomalous evolution of the magnetocaloric effect in dilute triangular Ising antiferromagnets Tb1–xYx(HCO2)3

Falsaperna, Mario, Bulled, Johnathan M., Stenning, Gavin B. G., Goodwin, Andrew L., Saines, P.J. (2022) Anomalous evolution of the magnetocaloric effect in dilute triangular Ising antiferromagnets Tb1–xYx(HCO2)3. Physical Review Materials, . ISSN 2475-9953. (In press) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided) (KAR id:98725)

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We investigate the effects of diamagnetic doping in the solid-solution series Tb1-xYx(HCO2)3, in which the parent Tb(HCO2)3 phase has previously been shown to host a combination of frustrated and quasi-1D physics, giving rise to a triangular Ising antiferromagnetic ground state that lacks long range 3D order. Heat capacity measurements show three key features: (i) a low temperature Schottky anomaly is observed, which is constant as a function of x; (ii) the transition temperature and associated entropy change are both surprisingly robust to diamagnetic doping; and (iii) an additional contribution at T < 0.4 K appears with increasing x. The origin of this unusual behaviour is rationalised in terms of the fragmentation of quasi-1D spin chains by the diamagnetic Y3+ dopant. Magnetocaloric measurements show a nonlinear dependence on x. The mass-weighted magnetocaloric entropy decreases across the series from the promising values in Tb(HCO2)3; however, the magnetocaloric entropy per magnetic Tb3+ ion first decreases then increases with increasing x. Our results establish Tb1-xYx(HCO2)3 as a model system in which to explore the functional ramifications of dilution in a low dimensional magnet.

Item Type: Article
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > Chemistry and Forensics
Funders: Leverhulme Trust (
Engineering and Physical Sciences Research Council (
European Research Council (
Depositing User: Paul Saines
Date Deposited: 06 Dec 2022 10:14 UTC
Last Modified: 07 Dec 2022 10:13 UTC
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