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This article is cited in 1 scientific paper (total in 1 paper)
Magnetism
Structural, magnetic, and magneto-caloric properties of Cu-substituted Nd$_{0.67}$Ba$_{0.33}$MnO$_3$ manganites
B. Sudakshinaab, B. Arunab, M. Vasundharaab a Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST),
Trivandrum-695 019, India
b Academy of Scientific and Innovative Research (AcSIR), CSIR-National Institute for Interdisciplinary Science and Technology
(CSIR-NIIST), Trivandrum, India
Abstract:
The crystal structure and magnetic properties of polycrystalline Nd$_{0.67}$Ba$_{0.33}$Mn$_{1-x}$Cu$_x$O$_3$($x$ = 0.00, 0.02, 0.04, 0.06, 0.08, and 0.10) manganites are discussed. All the samples are crystallized into an orthorhombic crystal structure with Imma symmetry space group and the obtained lattice parameters confirm the presence of a co-operative Jahn–Teller effect for all the studied compounds. X-ray photoelectron spectra suggest the ratio of Mn$^{3+}$/Mn$^{4+}$ ions are observed to be decreasing systematically with the increase of Cu-content substitution and affects the Cu-ions oxidations states. The ferromagnetic (FM) to paramagnetic (PM) transition and magnetic moment is found to decrease systematically with the increase of Cu-content substitution leading to the suppression of double-exchange interactions. The theoretical and experimentally observed values of effective PM moment and saturation magnetic moment confirm the presence of inhomogeneous magnetic states containing FM and antiferromagnetic phases in all the samples. A magnetic phase change, i. e., from second-order transition to first-order transition is witnessed in between the 4 to 6 at.% of the Cu substitution in Nd$_{0.67}$Ba$_{0.33}$MnO$_3$ mixed-valence manganite.
Keywords:
mixed-valence manganites, magnetic properties, X-ray photoelectron spectroscopy, magneto-caloric effect, Nd-based manganites, Jahn–Teller effect.
Received: 12.12.2019 Revised: 12.12.2019 Accepted: 16.12.2019
Citation:
B. Sudakshina, B. Arun, M. Vasundhara, “Structural, magnetic, and magneto-caloric properties of Cu-substituted Nd$_{0.67}$Ba$_{0.33}$MnO$_3$ manganites”, Fizika Tverdogo Tela, 62:5 (2020), 799; Phys. Solid State, 62:5 (2020), 902–911
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https://www.mathnet.ru/eng/ftt10192 https://www.mathnet.ru/eng/ftt/v62/i5/p799
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