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Quantum spin liquid candidate as superior refrigerant in cascade demagnetization cooling

Physics

Quantum spin liquid candidate as superior refrigerant in cascade demagnetization cooling

X. Liu, Y. Gao, et al.

Explore the groundbreaking research by Xin-Yang Liu and colleagues, revealing how quantum spin liquids offer exceptional cooling effects and enhanced magnetocaloric performance, potentially revolutionizing refrigeration technologies in space and quantum applications.

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~3 min • Beginner • English
Abstract
The quantum spin liquid (QSL) states with no long-range magnetic order even down to zero temperature have recently raised intensive research interest. Here we propose that the spin frustration characteristic of the QSL candidates also make them superior magnetocaloric materials that exhibit prominent cooling effect, especially near the quantum critical points. By simulating the highly frustrated kagome and triangular lattice models, we reveal a significant magnetothermal pumping effect when combing quantum magnets with paramagnetic salts, which can be exploited to design a high-performance cascade demagnetization refrigerator. Moreover, with realistic magnetic compounds YbAlO3 and Na2BaCo(PO4)2, we find a giant enhancement in the cooling capacity characterized by a great increment rate, e.g., more than 200% when working between 3 K heat sink and 30 mK load. Our work thus paves a promising and viable way for the quantum spin cooling to promote the helium-free refrigeration useful in space applications and quantum technologies.
Publisher
Communications Physics
Published On
Sep 21, 2022
Authors
Xin-Yang Liu, Yuan Gao, Han Li, Wentao Jin, Junsen Xiang, Hai Jin, Ziyu Chen, Wei Li, Gang Su
Tags
quantum spin liquids
magnetocaloric effect
cooling capacity
demagnetization refrigerator
quantum critical points
space technologies
kagome lattice
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