Spin state and magnetic ordering of half-doped Nd0.5Sr0.5CoO3 cobaltite

Reis, M. S.; Rocco, D. L.; Caraballo Vivas, R. J.; Pimentel, B.; Checca, N. R.; Torrão, R.; Paixão, L.; dos Santos, A. M.

doi:10.1016/j.jmmm.2016.08.080

Title: Spin state and magnetic ordering of half-doped Nd_0.5Sr_0.5CoO₃ cobaltite

Journal Article · Fri Aug 26 00:00:00 EDT 2016 · Journal of Magnetism and Magnetic Materials

DOI:https://doi.org/10.1016/j.jmmm.2016.08.080· OSTI ID:1830132

Reis, M. S. ^[1]; Rocco, D. L. ^[2]; Caraballo Vivas, R. J. ^[1]; Pimentel, B. ^[1]; Checca, N. R. ^[1]; Torrão, R. ^[1]; Paixão, L. ^[3];

^[4]

Universidade Federal Fluminense, Niteroi (Brazil). Inst. de Fisica
Universidade Federal Fluminense, Niteroi (Brazil). Inst. de Fisica; Centro Federal de Educação Tecnológica de Minas Gerais (CEFET), Timoteo (Brazil)
Universidade Federal Fluminense, Niteroi (Brazil). Inst. de Fisica; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Cobaltites show intriguing magnetic and transport properties, when compared with manganites for instance, as they exhibit an additional degree of freedom: the spin state of the Co ions. For Nd0.5Sr0.5CoO3 this spin configuration is not well-established, as well as the magnetic ordering below the Curie temperature. Thus, in the present effort, magnetization measurements and a mean-field theoretical model were developed in order to understand in detail these aspects of the half-doped Nd0.5Sr0.5CoO3 cobaltite. Overall, these results show that the Co and Nd magnetic sub-lattices couple antiferromagnetically below Curie temperature T_c = 215 K down to very low temperature. These findings clarify the presence of the plateau observed at 80 K on M(T) curve, which is erroneously attributed, in the literature, to the onset of an antiferromagnetic ordering. Magnetization data also clearly shows that Co³⁺ and Co⁴⁺ are in an intermediate spin state. In addition, experimental and theoretical magnetic entropy changes were determined and a comparative analysis among these two leads to ratify the results above claimed. Finally, from all those results, a magnetic phase diagram for Nd_0.5Sr_0.5CoO₃. could be drawn.

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

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

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

OSTI ID:: 1830132

Alternate ID(s):: OSTI ID: 1396802

Journal Information:: Journal of Magnetism and Magnetic Materials, Vol. 422; ISSN 0304-8853

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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References (19)

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36 MATERIALS SCIENCE
Cobaltites
Magnetic phase diagram
Anomalous XRD
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Magnetic entropy change
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Title: Spin state and magnetic ordering of half-doped Nd0.5Sr0.5CoO3 cobaltite

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Title: Spin state and magnetic ordering of half-doped Nd_0.5Sr_0.5CoO₃ cobaltite