Gradual pressure-induced enhancement of magnon excitations in CeCoSi

Nikitin, S. E.; Franco, D. G.; Kwon, Junyoung; Bewley, Robert; Podlesnyak, A.; Hoser, A.; Koza, Michael Marek; Geibel, C.; Stockert, O.

doi:10.1103/physrevb.101.214426

Cited by 23 publications

(30 citation statements)

References 33 publications

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“…2(a)-2(c), respectively. This is because the neutron diffraction has indicated the M x -type AFM state at low temperatures [56]. On the other hand, as the PIOP is still controversial, we discuss two types of AFQ states for candidates.…”

Section: B Local Hamiltonian For 4 F Electronsmentioning

confidence: 93%

“…The different low-energy crystal-field levels activate different types of odd-parity multipole orderings. In this appendix, we show the expected sublattice-dependent splittings in NQR and NMR spectra by supposing the low-energy crystal-field level consisting of the two Γ 7 doublets [56]. In this case, other two multipole orderings become possible: Q α 4z -type antiferroic hexadecapole ordering (AFH) with the odd-parity electric toroidal quadrupole G u and M 5u -type antiferroic triacontadipole ordering (AFT) with the magnetic toroidal dipole T z , where the functional forms of Q α 4z and M 5u are shown in Ref.…”

Section: Paramagnetic Statementioning

confidence: 99%

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NQR and NMR spectra in the odd-parity multipole material CeCoSi

Yatsushiro

Hayami

2020

Phys. Rev. B

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We theoretically study NQR and NMR spectra in the presence of odd-parity multipoles originating from staggered antiferromagnetic and antiferroquadrupole orderings. For the f-electron metal, CeCoSi, which is a candidate hosting odd-parity multipoles, we derive an effective hyperfine field acting on Co nucleus generated from electronic origin multipole moments at Ce ion under zero and nonzero magnetic fields. We elucidate that emergent odd-parity multipoles give rise to sublattice-dependent spectral splittings in NQR and NMR through the effective hyperfine coupling in the absence of the global inversion symmetry. We mainly examine behaviors of the NQR and NMR spectra in three odd-parity multipole ordered states: a y-type magnetic toroidal dipole order with a staggered x-type antiferromagnetic structure, an xy-type electric toroidal quadrupole order with a staggered x 2 − y 2-type antiferroquadrupole structure, and a z-type electric dipole order with a staggered 3z 2 − r 2type antiferroquadrupole structure. We show that different odd-parity multipole orders lead to different fielddependent spectral splittings in NMR, while only the xy-type electric toroidal quadrupole order exhibits the NQR spectral splitting. We also present possible sublattice-dependent spectral splittings for all the odd-parity multipole orders potentially activated in low-energy crystal-field levels, which will be useful to identify oddparity order parameters in CeCoSi by NQR and NMR measurements.

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Section: B Local Hamiltonian For 4 F Electronsmentioning

confidence: 93%

Section: Paramagnetic Statementioning

confidence: 99%

NQR and NMR spectra in the odd-parity multipole material CeCoSi

Yatsushiro

Hayami

2020

Phys. Rev. B

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“…The first unresolved issue of this phase is its intrinsic pressure phase diagram. Contrary to some reports [8,10], a study on single-crystalline samples proposed that this "pressure-induced ordered phase" already exists at ambient pressure below T 0 = 12 K [11]. The phase below T 0 at lower pressures seems to continuously connect to the pressure-induced phase [11,12].…”

mentioning

confidence: 61%

“…The spacial inversion symmetry is locally absent at the Ce site, whereas the crystal structure has the global inversion symmetry. The crystal electric field (CEF) ground state has been reported as the Γ 7 (∓0.306 |±5/2 ± 0.95 |∓3/2 ) Kramers doublet, and the first excited state is separated from it by ∼ 100 K [8]. It has been established that an antiferromagnetic (AFM) transition occurs at the Néel temperature T N = 9.4 K. The transition is of second-order [9], and the Ce moments with sizes of m Ce ∼ 0.37 (6)µ B are aligned along the [100] axis with a q = 0 structure, as revealed by a neutron scattering study [8].…”

mentioning

confidence: 99%

“…The crystal electric field (CEF) ground state has been reported as the Γ 7 (∓0.306 |±5/2 ± 0.95 |∓3/2 ) Kramers doublet, and the first excited state is separated from it by ∼ 100 K [8]. It has been established that an antiferromagnetic (AFM) transition occurs at the Néel temperature T N = 9.4 K. The transition is of second-order [9], and the Ce moments with sizes of m Ce ∼ 0.37 (6)µ B are aligned along the [100] axis with a q = 0 structure, as revealed by a neutron scattering study [8]. Another phase, which is a matter of interest, has been initially reported to emerge under pressure below ∼ 40 K at ∼ 1.5 GPa [10].…”

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confidence: 99%

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Unusual Nonmagnetic Ordered State in CeCoSi Revealed by $^{59}$Co-NMR and NQR Measurements

Manago,

Kotegawa,

Tou

et al. 2021

Preprint

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Nonlinear spin Hall effect in PT -symmetric collinear magnets

2022

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We theoretically investigate a nonlinear spin Hall effect in PT -symmetric antiferromagnetic metals, which serve as an efficient spin current generator. We elucidate that an emergent spin-dependent Berry curvature dipole is a microscopic origin of the nonlinear spin Hall effect, which becomes nonzero with neither relativistic spin-orbit coupling, uniform magnetization, nor spin-split band structure. By analyzing a microscopic antiferromagnetic model without spin-orbit coupling for an intuitive understanding of the phenomena, we elucidate essential hopping processes and a condition to enhance the nonlinear spin Hall conductivity. We also provide a complete table to include useful correspondence among the Néel vector, odd-parity multipoles, nonlinear spin conductivity tensor, and candidate materials in all the PT -symmetric black-and-white magnetic point groups.

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Gradual pressure-induced enhancement of magnon excitations in CeCoSi

Cited by 23 publications

References 33 publications

NQR and NMR spectra in the odd-parity multipole material CeCoSi

NQR and NMR spectra in the odd-parity multipole material CeCoSi

Unusual Nonmagnetic Ordered State in CeCoSi Revealed by $^{59}$Co-NMR and NQR Measurements

Nonlinear spin Hall effect in PT -symmetric collinear magnets

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