Efficient Adiabatic Demagnetization Refrigeration to below 50 mK with Ultrahigh-Vacuum-Compatible Ytterbium Diphosphates AYbP2 O7 (A =Na, K)

Arjun, U and Ranjith, KM and Jesche, A and Hirschberger, F and Sarma, DD and Gegenwart, P (2023) Efficient Adiabatic Demagnetization Refrigeration to below 50 mK with Ultrahigh-Vacuum-Compatible Ytterbium Diphosphates AYbP2 O7 (A =Na, K). In: Physical Review Applied, 20 (1).

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Abstract

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.

Item Type:	Journal Article
Publication:	Physical Review Applied
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to the American Physical Society.
Keywords:	Binary alloys; Magnetocaloric effects; Refrigeration; Sodium compounds; Temperature; Ytterbium compounds, 3He; Adiabatic demagnetization; Chemical instability; Diphosphates; Millikelvin; Millikelvin temperatures; Paramagnetic salts; Quantum device; Quantum phenomena; Water of crystallization, Specific heat
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	01 Aug 2023 05:09
Last Modified:	01 Aug 2023 05:09
URI:	https://eprints.iisc.ac.in/id/eprint/82735

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