Giant reversible magnetocaloric effect in the pyrochlore Er2Mn2O7 due to a cooperative two-sublattice ferromagnetic order

Cai, Y. Q.; Jiao, Y. Y.; Cui, Qi; Cai, J. W.; Li, Y.; Wang, B. S.; Fernandez-Diaz, M. T.; McGuire, Michael A.; Yan, J. -Q.; Alonso, J. A.; Cheng, J. -G.

doi:10.1103/PhysRevMaterials.1.064408

Title: Giant reversible magnetocaloric effect in the pyrochlore ${Er}_{2} {Mn}_{2} O_{7}$ due to a cooperative two-sublattice ferromagnetic order

Journal Article · Wed Nov 29 00:00:00 EST 2017 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.1.064408· OSTI ID:1412041

Cai, Y. Q. ^[1]; Jiao, Y. Y. ^[1]; Cui, Qi ^[1]; Cai, J. W. ^[2]; Li, Y. ^[2]; Wang, B. S. ^[1]; Fernandez-Diaz, M. T. ^[3];

^[4];

^[4]; Alonso, J. A. ^[5]; Cheng, J. -G. ^[1]

Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
Beijing Institute of Petrochemical Technology, Beijing (China)
Institut Laue Langevin, Grenoble (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Instituto de Ciencia de Materiales de Madrid, Madrid (Spain)

Most magnetic refrigeration materials showing a large and reversible magnetocaloric effect (MCE) undergo a second-order ferromagnetic (FM) transition involving large-moment magnetic species on one sublattice. Furthermore, a stronger MCE is expected near a cooperative FM order of two or more magnetic species with large magnetic moments residing on different sublattices, but experimental realizations are rare. Here we report on the discovery of large MCE in the cubic pyrochlore Er₂Mn₂O₇ near its second-order FM transition at T_c ≈ 34K; under the magnetic field change of 1 and 5 T, the maximum magnetic entropy change –ΔS_M is 5.27 and 16.1Jkg^–1K^–1, and the estimated magnetic refrigerant capacity reaches 68 and 522Jkg^–1, respectively. These latter values are among the largest for the known MCE materials. The observed giant and reversible MCE in Er₂Mn₂O₇ is mainly attributed to the large saturation moment of 18.9μ_B per formula unit owing to a simultaneous FM ordering of the rear-earth Er³⁺ and transition-metal Mn⁴⁺ localized moments. Our results suggest that Er₂Mn₂O₇ pyrochlore is a promising candidate for magnetic refrigeration applications in the temperature range 20–80 K. More importantly, this work provides a new material system for developing high-performance MCE materials that can exhibit a strongly coupled FM transition involving two magnetic sublattices of large local moments in a single-phase material.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1412041

Alternate ID(s):: OSTI ID: 1410587

Journal Information:: Physical Review Materials, Vol. 1, Issue 6; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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Title: Giant reversible magnetocaloric effect in the pyrochlore ${Er}_{2} {Mn}_{2} O_{7}$ due to a cooperative two-sublattice ferromagnetic order