Formation of Single Polar Domain in α-Cu2V2O7

Piyawongwatthana, Pharit; Okuyama, Daisuke; Nawa, K.; Matan, K.; Sato, Taku

doi:10.7566/jpsj.90.025003

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…Moreover, the systematic analysis provides an insight to construct an effective spin model so as to include essential model parameters in real materials, where targeting materials are easily found by using magnetic structure database, MAGNDATA [89], and cluster multipole analyses [85,90], from the symmetry viewpoint. In this way, our result will not only give a deep understanding of nonreciprocal magnon excitations in noncentrosymmetric magnets, such as α-Cu 2 V 2 O 7 [91][92][93][94], but also be a good indicator to examine the microscopic origin under complicated magnetic orderings.…”

Section: Discussionmentioning

confidence: 82%

Essential model parameters for nonreciprocal magnons in multisublattice systems

Hayami,

Matsumoto

2021

Preprint

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We theoretically investigate the microscopic conditions for emergent nonreciprocal magnons toward unified understanding on the basis of a microscopic model analysis. We show that the products of the Bogoliubov Hamiltonian obtained within the linear spin wave approximation is enough to obtain the momentum-space functional form and the key ingredients in the nonreciprocal magnon dispersions in an analytical way even without solving the eigenvalue problems. We find that the odd order of an effective antisymmetric Dzyaloshinskii-Moriya interaction and/or the even order of an effective symmetric anisotropic interaction in the spin rotated frame can be a source of the antisymmetric dispersions. We present possible kinetic paths of magnons contributing to the antisymmetric dispersions in the one-to four-sublattice systems with the general exchange interactions. We also test the formula for both ferromagnetic and antiferromagnetic orderings in the absence of spatial inversion symmetry.

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Section: Discussionmentioning

confidence: 82%

Essential model parameters for nonreciprocal magnons in multisublattice systems

Hayami,

Matsumoto

2021

Preprint

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“…Moreover, such an atomic-scale multipoles have been generalized so as to describe anisotropic charge and spin distributions over multiple sites, which are denoted as a cluster multipole [9][10][11][12][13][14] and a bond multipole [15,16]. The generalization of the concept of multipole is referred to as an augmented multipole, which opens a new direction of cross-correlated (multiferroic) physical phenomena in antiferromagnets, such as the anomalous Hall and Nernst effects in Mn 3 Sn [10,[17][18][19][20][21], current-induced magnetization in UNi 4 B [22][23][24][25] and Ce 3 TiBi 5 [26,27], and nonreciprocal magnon excitations in α-Cu 2 V 2 O 7 [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Spin-orbital-momentum locking under odd-parity magnetic quadrupole ordering

Hayami,

Kusunose

2021

Preprint

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Odd-parity magnetic and magnetic toroidal multipoles in the absence of both spatial-inversion and timereversal symmetries are sources of multiferroic and nonreciprocal optical phenomena. We investigate electronic states caused by an emergent odd-parity magnetic quadrupole (MQ) as a representative example of magnetic odd-parity multipoles. It is shown that spontaneous ordering of the MQ leads to an antisymmetric spin-orbital polarization in momentum space, which corresponds to a spin-orbital momentum locking at each wave vector. By symmetry argument, we show that the orbital or sublattice degree of freedom is indispensable to give rise to the spin-orbital momentum locking. We demonstrate how the electronic band structures are modulated by the MQ ordering in the three-orbital system, in which the MQ is activated by the spin-dependent hybridization between the orbitals with different spatial parities. The spin-orbital momentum locking is related with the microscopic origin of cross-correlated phenomena, e.g., the magnetic-field-induced symmetric and antisymmetric spin polarization in the band structure, the current-induced distortion, and the magnetoelectric effect. We also discuss similar spin-orbital momentum locking in antiferromagnet where the MQ degree of freedom is activated through the antiferromagnetic spin structure in a sublattice system.

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Spin-orbital-momentum locking under odd-parity magnetic quadrupole ordering

Hayami

Kusunose

2021

Phys. Rev. B

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Formation of Single Polar Domain in α-Cu₂V₂O₇

Cited by 4 publications

References 17 publications

Essential model parameters for nonreciprocal magnons in multisublattice systems

Essential model parameters for nonreciprocal magnons in multisublattice systems

Spin-orbital-momentum locking under odd-parity magnetic quadrupole ordering

Spin-orbital-momentum locking under odd-parity magnetic quadrupole ordering

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