期刊
PHYSICAL REVIEW MATERIALS
卷 6, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.6.124410
关键词
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资金
- European Research Council [788144]
- Engineering and Physical Sciences Research Council [EP/T027886/1]
- Leverhulme Trust [RPG-2018-268]
- EPSRC Advanced Materials Characterization Suite [EP1M0052411]
We investigated the effects of diamagnetic doping in the solid-solution series Tb1-xYx(HCO2)(3) and found that the properties of the system change with increasing doping concentration.
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-one-dimensional (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 behavior is rationalized 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.
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