Local structure and magnetic structure of spinel oxide MnV2O4 observed by Mössbauer spectroscopy

Shin Nakamura, Takuro Katsufuji

Research output: Contribution to journalArticle

Abstract

Mössbauer spectroscopic study has been conducted on a spinel oxide MnV2O4 by using a 1mol% 57Fe-substituted polycrystalline specimen as an absorber. The substituted 57Fe ions occupy both the A- and B-sites as Fe2+ and Fe3+ with a high-spin state, respectively. The Mössbauer spectra clarify the local crystallographic structure and the magnetic structure of both the Mn2+ ion at the A site and the V3+ ion at the B site. The spectra in the magnetically ordered phase were analyzed using a mixed magnetic and quadrupole Hamiltonian, and the magnetic structures were obtained by calculating the electric field gradient (EFG) axes with respect to the crystallographic axes. Below Tc ∼ 60K, a ferrimagnetic order along the 〈001〉c axis was observed in the cubic phase, whereas below Ts ∼ 50K, a simultaneous transition into a tetragonal phase and a canted ferrimagnetic state were observed. In this tetragonal phase, the V3+ spins were found to be almost within the tetragonal ð110 Þt [cubic (100)c] plain and inclined by 52° from the c-axis, while the Mn2+ spins were found to be along the c-axis opposite to the V3+ spins.

Original languageEnglish
Article number064703
Journaljournal of the physical society of japan
Volume88
Issue number6
DOIs
Publication statusPublished - 2019 Jan 1

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spinel
oxides
spectroscopy
ions
plains
absorbers
quadrupoles
gradients
electric fields

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  • Physics and Astronomy(all)

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Local structure and magnetic structure of spinel oxide MnV2O4 observed by Mössbauer spectroscopy. / Nakamura, Shin; Katsufuji, Takuro.

In: journal of the physical society of japan, Vol. 88, No. 6, 064703, 01.01.2019.

Research output: Contribution to journalArticle

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abstract = "M{\"o}ssbauer spectroscopic study has been conducted on a spinel oxide MnV2O4 by using a 1mol{\%} 57Fe-substituted polycrystalline specimen as an absorber. The substituted 57Fe ions occupy both the A- and B-sites as Fe2+ and Fe3+ with a high-spin state, respectively. The M{\"o}ssbauer spectra clarify the local crystallographic structure and the magnetic structure of both the Mn2+ ion at the A site and the V3+ ion at the B site. The spectra in the magnetically ordered phase were analyzed using a mixed magnetic and quadrupole Hamiltonian, and the magnetic structures were obtained by calculating the electric field gradient (EFG) axes with respect to the crystallographic axes. Below Tc ∼ 60K, a ferrimagnetic order along the 〈001〉c axis was observed in the cubic phase, whereas below Ts ∼ 50K, a simultaneous transition into a tetragonal phase and a canted ferrimagnetic state were observed. In this tetragonal phase, the V3+ spins were found to be almost within the tetragonal {\dh}110 {\TH}t [cubic (100)c] plain and inclined by 52° from the c-axis, while the Mn2+ spins were found to be along the c-axis opposite to the V3+ spins.",
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AB - Mössbauer spectroscopic study has been conducted on a spinel oxide MnV2O4 by using a 1mol% 57Fe-substituted polycrystalline specimen as an absorber. The substituted 57Fe ions occupy both the A- and B-sites as Fe2+ and Fe3+ with a high-spin state, respectively. The Mössbauer spectra clarify the local crystallographic structure and the magnetic structure of both the Mn2+ ion at the A site and the V3+ ion at the B site. The spectra in the magnetically ordered phase were analyzed using a mixed magnetic and quadrupole Hamiltonian, and the magnetic structures were obtained by calculating the electric field gradient (EFG) axes with respect to the crystallographic axes. Below Tc ∼ 60K, a ferrimagnetic order along the 〈001〉c axis was observed in the cubic phase, whereas below Ts ∼ 50K, a simultaneous transition into a tetragonal phase and a canted ferrimagnetic state were observed. In this tetragonal phase, the V3+ spins were found to be almost within the tetragonal ð110 Þt [cubic (100)c] plain and inclined by 52° from the c-axis, while the Mn2+ spins were found to be along the c-axis opposite to the V3+ spins.

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