A phenomenological study in CeCoSi system

Chandra, Sumal; Khatun, Arifa; Jannat, Romana

doi:10.1016/j.ssc.2020.113953

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…In the present study, we propose that the NQR and NMR can be another good probe to detect cluster odd-parity multipoles. To demonstrate that, we analyze the NQR and NMR spectra under the odd-parity multipole orderings by considering the candidate, CeCoSi, which may host two types of oddparity multipole orders depending on temperature and pressure [51][52][53][54][55][56][57][58]. The crystal structure of CeCoSi is the centrosymmetric CeFeSi-type structure (P4/nmm, D 7 4h , No.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Yatsushiro

Hayami

2020

Phys. Rev. B

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“…[44][45][46][47][48][49][50][51][52][53][54][55][56][57][58] CeCoSi is one of the potential candidates with AFQ orderings in the tetragonal crystal structure, where the CEF levels consist of only the Kramers pairs. [59][60][61][62][63][64][65][66][67][68][69][70][71][72][73] This material shows the signature of two ordered phases including a higherrank multipolar ordered phase, which is denoted as II and III phases in addition to a high-temperature paramagnetic phase (I phase); the low-temperature III phase was indicated to be characterized by an in-plane antiferromagnetic (AFM) spin configuration with ordering vector q = 0 and the II phase was suggested to be an AFQ phase, 60-62, 64, 70) although the order parameter of the II phase has not been identified yet. Since the q = 0 order described by the staggered-type alignment of the order parameters on two Ce ions [Ce (A) and Ce (B) in Fig.…”

Section: Introductionmentioning

confidence: 99%

Mean-field Study of Antiferromagnetic and Antiferroquadrupolar Orderings in Tetragonal CeCoSi

Yatsushiro,

Hayami

2022

Preprint

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We investigate the stability of the multipolar orderings in f -electron material CeCoSi based on a self-consistent meanfield calculation for the effective localized model. This material has two ordered phases in the temperature-pressure phase diagram: the antiferromagnetic phase and the nonmagnetic phase, the latter of which has been suggested to be an antiferroquadrupolar phase. Meanwhile, the origin of the antiferroquadrupolar phase has been unclear, since a quadrupole degree of freedom is present only between the ground-state level and highly separated excited-state level under a tetragonal crystalline electric field (CEF), whose energy scale is much larger than the transition temperature. To understand the sequence of the phase transition from the paramagnetic phase, antiferroquadrupolar phase, and antiferromagnetic phase when decreasing the temperature, we examine the important interaction parameters in the effective localized model. We clarify that the 3z 2 − r 2 -type of the antiferroquadrupolar interactions can renormalize the CEF level splitting, which assists a quadrupolar ordering even in a tetragonal system without orbital degeneracy. Moreover, the stability of the antiferroquadrupolar and antiferromagnetic states in a magnetic field and the behavior of the magnetic/quadrupolar susceptibility are also presented for the information to identify the unknown order parameter in the nonmagnetic ordered phase.

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Mean-Field Study of Antiferromagnetic and Antiferroquadrupolar Orderings in Tetragonal CeCoSi

Yatsushiro

Hayami

2022

J. Phys. Soc. Jpn.

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A phenomenological study in CeCoSi system

Cited by 3 publications

References 22 publications

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

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

Mean-field Study of Antiferromagnetic and Antiferroquadrupolar Orderings in Tetragonal CeCoSi

Mean-Field Study of Antiferromagnetic and Antiferroquadrupolar Orderings in Tetragonal CeCoSi

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