Efficient Adiabatic Demagnetization Refrigeration to below 50 mK with Ultrahigh-Vacuum-Compatible Ytterbium Diphosphates AYbP2O7 (A=Na, K)

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 EMFL, CNRS, F-38042 Grenoble, France

来源：

PHYSICAL REVIEW APPLIED | 2023年 / 20卷 / 01期

关键词：

MAGNETIC-STRUCTURE; TEMPERATURE; ABSOLUTE; ADR;

D O I：

10.1103/PhysRevApplied.20.014013

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Attaining millikelvin (mK) temperatures is often a prerequisite for the study of quantum phenomena and the operation of quantum devices. Adiabatic demagnetization refrigeration (ADR) is an effective, easy, and sustainable alternative to evaporation or dilution cooling with the rare and superexpensive 3He. Paramagnetic salts, traditionally used for mK ADR, suffer from chemical instability related to water of crystallization. We report synthesis, characterization, as well as low-temperature magnetization and specific heat measurements of two alternative UHV-compatible candidate materials NaYbP2O7 and KYbP2O7. Utilizing the physical property measurement system at 2 K, the ADR of sintered pellets with Ag powder admixture starting at 5 T yields base temperatures (warm-up times) of 45 mK (55 min) and 37 mK (35 min) for NaYbP2O7 and KYbP2O7, respectively, slightly advantageous to KBaYb(BO3)2 (45 mK and 40 min) studied under similar conditions.

引用

页数：10

共 60 条

[11] THE THERMAL AND MAGNETIC PROPERTIES OF CHROMIUM POTASSIUM ALUM BELOW 0.1-DEGREES-K [J].