Low Temperature Structural Instability of Tetragonal Spinel Mn<sub>3</sub>O<sub>4</sub>

Chung, Jaiho; Lee, Kee Hwan; Song, Young-Suk; Suzuki, Takehito; Katsufuji, T.

doi:10.7566/jpsj.82.034707

Cited by 25 publications

(25 citation statements)

References 26 publications

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“…41 In Mn 3 O 4 , we did not find a similar anomalous temperature dependence for any of the magnetic excitations we were able to observe. Spin-lattice coupling is known to have significant effects in Mn 3 O 4 , 21,22,[42][43][44][45] which raises the question of why we do not observe magnon anomalies in Mn 3 O 4 similar to that observed in MnV 2 O 4 . A likely reason for this discrepancy is simply that magnonphonon coupling in Mn 3 O 4 occurs in a region of the Brillouin zone that is inaccessible to Raman scattering.…”

Section: Discussionmentioning

confidence: 80%

Magnon spectra and strong spin-lattice coupling in magnetically frustratedMnB2O4(B=Mn,V): Inelastic light-scattering studies

et al. 2014

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The ferrimagnetic spinels MnB2O4 (B = Mn,V) exhibit a similar series of closely spaced magnetic and structural phase transitions at low temperatures, reflecting both magnetic frustration and a strong coupling between the spin and lattice degrees of freedom. Careful studies of excitations in MnB2O4 (B = Mn,V), and the evolution of these excitations with temperature, are important for obtaining a microscopic description of the role that magnetic excitations and spin-lattice coupling play in the low temperature phase transitions of these materials. We report an inelastic light (Raman) scattering study of the temperature and magnetic field dependences of one-and twomagnon excitations in MnV2O4 and Mn3O4. We observe a pair of q = 0 one-magnon modes at 74 cm −1 and 81 cm −1 in MnV2O4, which is in contrast with the single 80 cm −1 q = 0 magnon that has been reported for MnV2O4 based on previous neutron scattering measurements and spin wave calculations. Additionally, we find that the two-magnon energy of MnV2O4 decreases ("softens") with decreasing temperature below TN , which we attribute to strong coupling between magnetic and vibrational excitations near the zone boundary.

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Section: Discussionmentioning

confidence: 80%

Magnon spectra and strong spin-lattice coupling in magnetically frustratedMnB2O4(B=Mn,V): Inelastic light-scattering studies

et al. 2014

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“…15 Figure 6(c) shows a Mn 3+ 4 tetrahedron. The direct overlap of t 2g orbitals between the top and bottom Mn 3+ ions, which causes a strong antiferromagnetic exchange interaction, is quite sensitive to the distance between the ions.…”

Section: Resultsmentioning

confidence: 98%

Interplay among spin, orbital, and lattice degrees of freedom in a frustrated spinel Mn3O4

et al. 2013

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We have investigated magnetic-field (H [100]) effect on a spin-frustrated tetragonally distorted spinel Mn 3 O 4 by measurements of magnetization, dielectric constant, and strain as well as synchrotron x-ray and neutron diffraction. In two low-temperature phases below 40 K, long-wavelength lattice modulations coupled with magnetic order have been confirmed, revealing spin-lattice coupling caused by the exchange striction in the geometrically frustrated Mn 3+ spin moments on the distorted pyrochlore lattice. A magnetic-field-induced phase transition has been found at low temperatures, which involves an abrupt change in both structural and magnetic configurations. The magnetostructural phase transition by the application of a magnetic field H [100] is discussed in terms of interplay among spin, orbital, and lattice degrees of freedom.

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“…This strong coupling is proposed to originate from the geometric frustration of the Mn 3+ spins, which is only partially relieved by the hightemperature, cubic-to-tetragonal distortion. 24,29 The resultant exchange striction in the magnetically-ordered state leads to a cell-doubled-orthorhombic (CDO) structure whose modulation is of the form pictured in Fig. 1(b netic fields applied in the (001) plane (magnetic easy plane).…”

Section: 28mentioning

confidence: 99%

Effects of magnetic field and twin domains on magnetostructural phase mixture inMn3O4: Raman scattering studies of untwinned crystals

et al. 2016

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The ferrimagnetic spinel Mn3O4 exhibits large and anisotropic changes in electronic and structural properties in response to an applied magnetic field. These changes are thought to result from the field-dependent tuning-via strong spin-lattice coupling-between two nearly degenerate magnetostructural phases. Recent variable-magnetic-field studies of Mn3O4 have been performed on melt-grown crystals, which can exhibit twin domains due to a Jahn-Teller structural transition below the melting temperature. Because of the near degeneracy of the magnetostructural phases, however, strain associated with the twin domains likely affects the magnetic responses of Mn3O4. In this report, we present a variable-magnetic-field Raman scattering study of untwinned Mn3O4 crystals grown out of a flux below the Jahn-Teller structural transition. We measure distinct q = 0 magnetic and vibrational excitation spectra for each isolated magnetostructural phase of untwinned Mn3O4 crystals and determine the symmetries of the observed excitations. We determine how the magnetostructural phase mixture changes in response to magnetic fields applied in the magnetic easy plane. Lastly, by comparing results on flux-and melt-grown Mn3O4 crystals, we show that the intrinsic mixture of the two magnetostructural phases is indeed strongly influenced by the presence of twin domains.

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Low Temperature Structural Instability of Tetragonal Spinel Mn₃O₄

Cited by 25 publications

References 26 publications

Magnon spectra and strong spin-lattice coupling in magnetically frustratedMnB2O4(B=Mn,V): Inelastic light-scattering studies

Magnon spectra and strong spin-lattice coupling in magnetically frustratedMnB2O4(B=Mn,V): Inelastic light-scattering studies

Interplay among spin, orbital, and lattice degrees of freedom in a frustrated spinel Mn3O4

Effects of magnetic field and twin domains on magnetostructural phase mixture inMn3O4: Raman scattering studies of untwinned crystals

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Low Temperature Structural Instability of Tetragonal Spinel Mn3O4

Cited by 25 publications

References 26 publications

Magnon spectra and strong spin-lattice coupling in magnetically frustratedMnB2O4(B=Mn,V): Inelastic light-scattering studies

Magnon spectra and strong spin-lattice coupling in magnetically frustratedMnB2O4(B=Mn,V): Inelastic light-scattering studies

Interplay among spin, orbital, and lattice degrees of freedom in a frustrated spinel Mn3O4

Effects of magnetic field and twin domains on magnetostructural phase mixture inMn3O4: Raman scattering studies of untwinned crystals

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Low Temperature Structural Instability of Tetragonal Spinel Mn₃O₄