Giant magnetocaloric effect in magnetoelectric Eu{sub 1-x}Ba{sub x}TiO{sub 3}

Journal Article · Mon Jan 20 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4862981· OSTI ID:22280585

Rubi, Km; Kumar, Pawan; Maheswar Repaka, D. V.; Chen, Ruofan; Wang, Jian-Sheng

We report the magnetic entropy change (ΔS{sub m}) in magnetoelectric Eu{sub 1-x}Ba{sub x}TiO{sub 3} for 0.1 ≤ x ≤ 0.9. We find −ΔS{sub m} = 11 (40) J/kg·K in x = 0.1 for a field change of 1 (5) T, respectively, which is the largest value among all Eu-based oxides. ΔS{sub m} arises from the field-induced suppression of the spin entropy of Eu{sup 2+}:4f{sup 7} localized moments. While ∣−ΔS{sub m}∣ decreases with increasing x, ∣−ΔS{sub m}∣ = 6.58 J/kg·K observed in the high spin diluted composition x = 0.9 is larger than that in many manganites. Our results indicate that these magnetoelectrics are potential candidates for cryogenic magnetic refrigeration.

• OSTI ID: 22280585
• Journal Information: Applied Physics Letters, Vol. 104, Issue 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM COMPOUNDS
CONCENTRATION RATIO
ELECTRICAL PROPERTIES
ENTROPY
EUROPIUM IONS
EUROPIUM OXIDES
MAGNETIC PROPERTIES
SPIN
TITANATES