Adiabatic demagnetization refrigeration to millikelvin temperatures with the distorted square lattice magnet NaYbGeO4

被引：19
作者：
Arjun, U. [1 ,2 ]
Ranjith, K. M. [3 ]
Jesche, A. [2 ]
Hirschberger, F. [2 ]
Sarma, D. D. [1 ]
Gegenwart, P. [2 ]
机构：
[1] Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India
[2] Univ Augsburg, Inst Phys, Ctr Elect Correlat & Magnetism, Expt Phys 6, D-86135 Augsburg, Germany
[3] Univ Grenoble Alpes, Lab Natl Champs Magnet Intenses, CNRS, EMFL, F-38042 Grenoble, France
来源：
PHYSICAL REVIEW B | 2023年 / 108卷 / 22期
关键词：
ANTIFERROMAGNET; ABSOLUTE; ADR;
D O I：
10.1103/PhysRevB.108.224415
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report the synthesis, characterization, low-temperature magnetic, and thermodynamic measurements of the millikelvin adiabatic demagnetization refrigeration (mK-ADR) candidate material NaYbGeO4 which exhibits a distorted square lattice arrangement of YbO6 magnetic units. Magnetization and specific heat indicate weakly interacting effective spin-1/2 moments below 10 K, with a Curie-Weiss temperature of only 15 mK, that can be polarized by magnetic fields of order 1 T. For the ADR performance test, we start the demagnetization from 5 T at a temperature of -2 K and reach a minimum temperature of 150 mK at zero field. The warming curve indicates a sharp magnetic transition in the heat capacity at 210 mK, implying only weak magnetic frustration. The entropy density of SGS <^> 101 mJ K-1cm-3 and hold time below 2 K of 220 min are competitive while the minimal temperature is higher compared to frustrated Ytterbium-oxide ADR materials studied under similar conditions.
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页数：8
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