Persistent and reversible phase control in GdMnO<sub>3</sub>near the phase boundary

Kuwahara, H.; Akaki, Mitsuru; Tozawa, J.; Hitomi, M.; Noda, Kohei; Akahoshi, Daisuke

doi:10.1088/1742-6596/150/4/042106

Cited by 8 publications

(3 citation statements)

References 7 publications

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“…GdMnO 3 is one of the perovskite manganites with the rare earth ionic radius lying between La and Dy, which shows fascinating physical properties as functions of temperature, magnetic field and external pressure [12][13][14][15][16][17][18][19]. Previous research shows that it transforms from a paramagnetic phase to an incommensurate antiferromagnetic (ICAFM) state at ∼42 K and from ICAFM to a canted A-type antiferromagnet (cAFM) phase at ∼20 K [13].…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced structural change in orthorhombic perovskite GdMnO₃

Lin

Zhang

Liu

et al. 2012

J. Phys.: Condens. Matter

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Structural stability of the perovskite-type GdMnO 3 has been investigated by the synchrotron angle-dispersive x-ray diffraction technique up to 63 GPa in a diamond anvil cell. GdMnO 3 stays in an orthorhombic structure but undergoes an isostructural phase transition with ∼5% volume reduction at 50 GPa. In the parent orthorhombic phase, the compressions along a, b and c axes exhibit a large anisotropic behavior. With increasing pressure, our results show that the distortion and tilts of the MnO 6 octahedra are reduced continuously and the orthorhombic structure evolves towards higher symmetry. By fitting the observed pressure-volume data using the third-order Birch-Murnaghan equation of state, we obtain the bulk modulus B 0 = 156(3) GPa with B 0 = 6.5(3) for the starting orthorhombic phase. Upon decompression, the starting orthorhombic phase is recovered.

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Section: Introductionmentioning

confidence: 99%

Pressure-induced structural change in orthorhombic perovskite GdMnO₃

Lin

Zhang

Liu

et al. 2012

J. Phys.: Condens. Matter

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“…Magnetodielectric materials are characterized by a strong coupling of the magnetic and dielectric properties. Among other multiferroics, TbMnO 3 and GdMnO 3 reveal a strong magneto-dielectric coupling and as a consequence fundamentally different spin excitations could exist: electro-active magnons (or electromagnons), spin waves that can be excited by a.c. electric fields [14] GdMnO 3 nano particles have metamagnetic features with a transition from antiferromagnetic to weak-ferromagnetic state upon cooling and the antiferromagnetic alignments of Gd sublattice below 6 K [15]. Investigation on a nano particles of GdMnO 3 show a significantly strong increase in magnetization at about 20 K, indicating a canted state of the spontaneous magnetization [16,17].…”

Section: Introductionmentioning

confidence: 99%

Thermal, Magnetic and Electrical Properties of Multiferroic GdMnO₃Nano Particles by a Co-Precipitation Method

Prakash

Kumar

Buddhudu

2012

Ferroelectrics Letters Section

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In the present work, GdMnO 3 multiferroic materials have been synthesized by a conventional chemical co-precipitation method to study their thermal, structural, magnetic and electrical properties of multiferroic GdMnO 3 nano particles. These materials have been sintered at different temperatures of 700 • C, 800 • C, 900 • C, 1000 • C and 1100 • C respectively in order to evaluate their optimum sintering temperature based on XRD profiles. These materials are found to be in orthorhombic crystal structure (JCPDS Card No: 250337) and their lattice parameters are a = 5.310Å, b = 5.840Å and c = 7.430 Å. The morphology of the GdMnO 3 nano particles has been examined from the measurement of HRSEM images with the changes in sintering temperatures. Elemental analysis of host matrix has been confirmed from the EDAX profile. Functional groups of GdMnO 3 have also been analyzed from their FTIR spectral. Thermal analysis of the as synthesized chemicals combination has been carried out from the measurement of its TG-DTA features and these results have been correlated with XRD profiles. For these materials, dielectric properties ((ε and ε ) ac conductivity (σ ac ) and dc conductivity) in the range of 100 Hz -1 MHz at the room temperature have also been investigated. The zero-field-cooled (ZFC) and field-cooled (FC) magnetizations could reveal that complex magnetic transitions would occur in a temperature range from 20 to 200 K (keeping the field constant at H = 500 Oe) confirming these trends in the forms magnetic hysteresis loops in evaluating their potential uses in different multiferroic applications.

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“…Some samples of GdMnO3 have an additional first order transition, referred to here as occurring at TN3 (GdMnO3 A in figure 1). In zero magnetic field, TN3 might be ~10-13 K on heating and ~5 K on cooling [17,44] or ~8 K on heating and ~5 K on cooling [2,3]. The transition is associated with the development of electric polarisation parallel to [100] [3,4,17,45] of a commensurate magnetic cycloid in the (001) plane ("ab-cycloid") [45,46].…”

Section: Transition Sequencesmentioning

confidence: 99%

Strain relaxation dynamics of multiferroic orthorhombic manganites

Carpenter

Pesquera

O’Flynn

et al. 2021

J. Phys.: Condens. Matter

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Resonant Ultrasound Spectroscopy has been used to characterise strain coupling and relaxation behaviour associated with magnetic/magnetoelectric phase transitions in GdMnO3, TbMnO3 and TbMn0.98Fe0.02O3 through their influence on elastic/anelastic properties. Acoustic attenuation ahead of the paramagnetic → colinear-sinusoidal/incommensurate/antiferromagnetic transition at ~41 K correlates with anomalies in dielectric properties and is interpreted in terms of Debye-like freezing processes. A loss peak at ~150 K is related to a steep increase in electrical conductivity with a polaron mechanism. The activation energy, Ea, of ≥ ~0.04 eV from a loss peak at ~80 K is consistent with the existence of a well-defined temperature interval in which the paramagnetic structure is stabilised by local, dynamic correlations of electric and magnetic polarisation that couple with strain and have relaxation times in the vicinity of ~10 -6 s. Comparison with previously published data for Sm0.6Y0.4MnO3 confirms that this pattern may be typical for multiferroic orthorhombic RMnO3 perovskites (R = Gd, Tb, Dy). A frequencydependent loss peak near 10 K observed for TbMnO3 and TbMn0.98Fe0.02O3, but not for GdMnO3, yielded Ea ≥ ~0.002 eV and is interpreted as freezing of some magnetoelastic component of the cycloid structure. Small anomalies in elastic properties associated with the incommensurate and cycloidal magnetic transitions confirm results from thermal expansion data that the magnetic order parameters have weak but significant coupling with strain. Even at strain magnitudes of ~0.1-1 ‰, polaron-like strain effects are clearly important in defining the development and evolution of magnetoelectric properties in these materials. Strains associated with the cubicorthorhombic transition due to the combined Jahn-Teller/octahedral tilting transition in the vicinity of 1500 K are 2-3 orders of magnitude greater. It is inevitable that ferroelastic twin walls due to this transition would have significantly different magnetoelectric properties from homogeneous domains due to magnetoelastic coupling with steep strain gradients.

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Persistent and reversible phase control in GdMnO₃near the phase boundary

Cited by 8 publications

References 7 publications

Pressure-induced structural change in orthorhombic perovskite GdMnO₃

Pressure-induced structural change in orthorhombic perovskite GdMnO₃

Thermal, Magnetic and Electrical Properties of Multiferroic GdMnO₃Nano Particles by a Co-Precipitation Method

Strain relaxation dynamics of multiferroic orthorhombic manganites

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Persistent and reversible phase control in GdMnO3near the phase boundary

Cited by 8 publications

References 7 publications

Pressure-induced structural change in orthorhombic perovskite GdMnO3

Pressure-induced structural change in orthorhombic perovskite GdMnO3

Thermal, Magnetic and Electrical Properties of Multiferroic GdMnO3Nano Particles by a Co-Precipitation Method

Strain relaxation dynamics of multiferroic orthorhombic manganites

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Persistent and reversible phase control in GdMnO₃near the phase boundary

Pressure-induced structural change in orthorhombic perovskite GdMnO₃

Pressure-induced structural change in orthorhombic perovskite GdMnO₃

Thermal, Magnetic and Electrical Properties of Multiferroic GdMnO₃Nano Particles by a Co-Precipitation Method