Spin Waves in Doped Manganites

Kaplan, T. A.; Mahanti, S. D.

doi:10.1007/0-306-47091-8_8

Cited by 32 publications

(56 citation statements)

References 23 publications

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“…From the result, we conclude that the system exhibits a large toroidal magnetic response at and slightly above the critical temperature. Note that similar behavior was observed in the magnetoresistance in the so-called double-exchange systems, such as perovskite manganese oxides [39][40][41][42] . On the other hand, as shown in Fig.…”

Section: Bsupporting

confidence: 70%

Toroidal order in metals without local inversion symmetry

2014

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Toroidal order, given by a composite of electric and magnetic orders, manifests itself not only in the peculiar magnetism but also in anomalous transport and magnetoelectric effect. We report our theoretical results on the influence and stability of a toroidal order in metals on the basis of a microscopic model. We consider an effective single-band Hubbard-type model with a site-dependent antisymmetric spin-orbit coupling, which is derived from a four-band tight-binding model including the atomic spin-orbit coupling, off-site hybridizations between orbitals with different parities, and odd-parity crystalline electric field. For this single-band model on a layered honeycomb lattice, we investigate the electronic structure, magnetotransport, and magnetoelectric effect in the toroidal ordered state with a vortex-like magnetic structure. The ferroic order of the microscopic toroidal moments acts as an effective gauge field for electrons, which modulates the electronic band structure with a shift of the band bottom in the momentum space. In addition, the site-dependent antisymmetric spin-orbit coupling gives rise to highly anisotropic Hall responses. The most salient feature is two different types of magnetoelectric responses: one is a magnetic order with net toroidal magnetization induced by an electric current perpendicular to the planes, and the other is a uniform transverse magnetization induced by an electric current within the planes. We examine the ground state of the effective model by the mean-field approximation, and show that the toroidal order is stabilized by strong electron correlations at low electron density. We also discuss the temperature dependence of the magnetoelectric effects associated with spontaneous toroidal ordering. Implications to experiments are also presented.

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Section: Bsupporting

confidence: 70%

Toroidal order in metals without local inversion symmetry

2014

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“…19 The magnetic phases observed at lower temperatures result essentially from the ordering of the Mn spins 1 S , 2 S , 3 S and 4 S which, in the paramagnetic phase, are located in the unit cell at the positions (o,o,½), (½,o,o), (o,½, ½) and (½, ½, o), respectively 1 . At the centre of the Brillouin zone ( 0 k = ), the 12 components of these spins generate a reducible co-representation Γ of the paramagnetic space group, whose decomposition into a direct sum of irreducible co-representations leads to A S S S S = + − − , C S S S S = − + − .…”

Section: The Critical Behaviour Of the Different Rmno 3 Compoundsmentioning

confidence: 99%

“…19), the Mn 3+ electronic configuration is (see table I). Consequently, the system 2 We will adopt the Pnma setting, as opposed to the Pbnm setting used by some authors.…”

Section: The Critical Behaviour Of the Different Rmno 3 Compoundsmentioning

confidence: 99%

Landau model for the phase diagrams of the orthorhombic rare-earth manganitesRMnO3(R=Eu, Gd, Tb, Dy, Ho)

Ribeiro

Vieira

2010

Phys. Rev. B

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The present work aims to describe, within a single phenomenological approach, the specific sequence of phase transitions observed in the rare-earth manganites RMnO 3 at zero magnetic field. It is shown that a single integrated description of the temperature versus composition phase diagrams of these compounds and related solid solutions can be obtained within the scope of Landau theory by adopting the so called type-II description of the modulated phases. 75.85.+t, 64.70.Rh, 75.47.Lx,

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“…Since the discovery of a colossal magnetoresistance (CMR) effect in manganite thin films by von Helmolt et al in 1993 [2], interest in the magnetic structure and the metal insulator transition has been renewed [3][4][5].…”

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confidence: 99%

Intrinsic Inhomogeneities in Manganite Thin Films Investigated with Scanning Tunneling Spectroscopy

et al. 2002

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Thin films of La 0.7 Sr 0.3 MnO 3 on MgO show a metal insulator transition and colossal magnetoresistance. The shape of this transition can be explained by intrinsic spatial inhomogeneities, which give rise to a domain structure of conducting and insulating domains at the sub micrometer scale. These domains then undergo a percolation transition.The tunneling conductance and tunneling gap measured by scanning tunneling spectroscopy were used to distinguish and visualize these domains.

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Spin Waves in Doped Manganites

Cited by 32 publications

References 23 publications

Toroidal order in metals without local inversion symmetry

Toroidal order in metals without local inversion symmetry

Landau model for the phase diagrams of the orthorhombic rare-earth manganitesRMnO3(R=Eu, Gd, Tb, Dy, Ho)

Intrinsic Inhomogeneities in Manganite Thin Films Investigated with Scanning Tunneling Spectroscopy

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