Large magnetocaloric effect in EuGd2O4 and EuDy2O4

Palacios, E. (Universidad de Zaragoza) ; Saez-Puche, R. ; Romero, J. ; Doi, Y. ; Hinatsu, Y. ; Evangelisti, M.

Resumen: Magnetization, heat capacity and direct measurements of the magnetocaloric effect show that EuGd2O4 and EuDy2O4 have a remarkably large magnetocaloric effect at cryogenic temperatures, owing to their high magnetic density and low ordering temperatures. The Gd derivative orders antiferromagnetically at T-N = 4.6 K, while its magnetocaloric effect largely exceeds that of the reference refrigerant Gadolinium Gallium Garnet (GGG) above 5 K. The Dy derivative undergoes two phase transitions at T-C1 = 3.65 K and T-C2 = 4.7 K, respectively, which are the result of a peculiar magnetic arrangement: the first Dy sublattice is parallel to the crystallographic c-axis, while the Eu sublattice makes a variable angle from 0 degrees to 45 degrees with the direction of the second Dy sublattice that lies in the ab-plane. EuDy2O4 has a lower magnetocaloric effect than EuGd2O4, yet larger than GGG. Both ordering mechanisms are semi-quantitatively explained within the frame of a mean-field simulation, which takes into account the magnetic anisotropy strength of the participating magnetic ions. (C) 2021 The Author(s). Published by Elsevier B.V.

Idioma: Inglés

DOI: 10.1016/j.jallcom.2021.161847

Año: 2022

Publicado en: JOURNAL OF ALLOYS AND COMPOUNDS 890 (2022), 161847 [13 pp]
ISSN: 0925-8388

Factor impacto JCR: 6.2 (2022)

Categ. JCR: METALLURGY & METALLURGICAL ENGINEERING rank: 8 / 79 = 0.101 (2022) - Q1 - T1
Categ. JCR: CHEMISTRY, PHYSICAL rank: 45 / 161 = 0.28 (2022) - Q2 - T1
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 91 / 343 = 0.265 (2022) - Q2 - T1

Factor impacto CITESCORE: 10.9 - Materials Science (Q1) - Engineering (Q1)

Factor impacto SCIMAGO: 1.079 - Materials Chemistry (Q1) - Metals and Alloys (Q1) - Mechanics of Materials (Q1) - Mechanical Engineering (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E11-20R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/MAT2017-84385-R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/MAT2017-86019-R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/RTI2018-098537-B-C22

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)