dorsal/arxiv
View SchemaIsing Supercriticality and Universal Magnetocalorics in Spiral Antiferromagnet Nd$_3$BWO$_9$
| Authors | Xinyang Liu, Enze Lv, Xueling Cui, Han Ge, Fangyuan Song, Liusuo Wu, Zhaoming Tian, Peijie Sun, Gang Su, Kan Zhao, Junsen Xiang, Wei Li |
|---|---|
| Categories | |
| ArXiv ID | 2601.07810vv1 |
| URL | https://arxiv.org/abs/2601.07810 |
| License | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
Abstract
The celebrated analogy between the pressure-temperature phase diagram of a liquid-gas system and the field-temperature phase diagram of an Ising ferromagnet has long been a cornerstone for understanding universality in critical phenomena. Here we extend this analogy to a highly frustrated antiferromagnet, the kagome-layered spiral Ising compound Nd$_3$BWO$_9$. In its field-temperature phase diagram, we identify a critical endpoint (CEP) and an associated Ising supercritical regime (ISR). The CEP of the metamagnetic transition is located at ${\mu_0H_c} \simeq 1.04$ T and $T_c \simeq 0.3$ K. Above this point, the ISR emerges with supercritical crossover lines that adhere to a universal scaling law, as evidenced by the specific heat and magnetic susceptibility measurements. Remarkably, we observe a universally divergent Grueneisen ratio near the emergent CEP, $\Gamma_H \propto 1/t^{\beta+\gamma-1}$, with ${\beta} + {\gamma} \simeq 1.563$ the critical exponents of the 3D Ising universality class and $t \equiv (T - T_c)/T_c$ the reduced temperature. Our adiabatic demagnetization measurements on Nd$_3$BWO$_9$ reveal a lowest temperature of 195 mK achieved from 2 K and 4 T. Our work opens new avenues for studying supercritical physics and efficient cooling in layered-kagome, rare-earth RE$_3$BWO$_9$ family and, more broadly, in Ising-anisotropic magnets like spin ices.
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"abstract": "The celebrated analogy between the pressure-temperature phase diagram of a liquid-gas system and the field-temperature phase diagram of an Ising ferromagnet has long been a cornerstone for understanding universality in critical phenomena. Here we extend this analogy to a highly frustrated antiferromagnet, the kagome-layered spiral Ising compound Nd$_3$BWO$_9$. In its field-temperature phase diagram, we identify a critical endpoint (CEP) and an associated Ising supercritical regime (ISR). The CEP of the metamagnetic transition is located at ${\\mu_0H_c} \\simeq 1.04$ T and $T_c \\simeq 0.3$ K. Above this point, the ISR emerges with supercritical crossover lines that adhere to a universal scaling law, as evidenced by the specific heat and magnetic susceptibility measurements. Remarkably, we observe a universally divergent Grueneisen ratio near the emergent CEP, $\\Gamma_H \\propto 1/t^{\\beta+\\gamma-1}$, with ${\\beta} + {\\gamma} \\simeq 1.563$ the critical exponents of the 3D Ising universality class and $t \\equiv (T - T_c)/T_c$ the reduced temperature. Our adiabatic demagnetization measurements on Nd$_3$BWO$_9$ reveal a lowest temperature of 195 mK achieved from 2 K and 4 T. Our work opens new avenues for studying supercritical physics and efficient cooling in layered-kagome, rare-earth RE$_3$BWO$_9$ family and, more broadly, in Ising-anisotropic magnets like spin ices.",
"arxiv_id": "2601.07810",
"authors": [
"Xinyang Liu",
"Enze Lv",
"Xueling Cui",
"Han Ge",
"Fangyuan Song",
"Liusuo Wu",
"Zhaoming Tian",
"Peijie Sun",
"Gang Su",
"Kan Zhao",
"Junsen Xiang",
"Wei Li"
],
"categories": [
"cond-mat.str-el",
"cond-mat.mtrl-sci"
],
"license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
"title": "Ising Supercriticality and Universal Magnetocalorics in Spiral Antiferromagnet Nd$_3$BWO$_9$",
"url": "https://arxiv.org/abs/2601.07810",
"version": "v1"
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