Variation in Superconducting Symmetry Against Pressure on Noncentrosymmetric Superconductor Cd2Re2O7 Revealed by 185/187Re Nuclear Quadrupole Resonance

Kitagawa, Shunsaku; Ishida, Kenji; Kobayashi, Tatsuo; Matsubayashi, Yasuhito; Hirai, Daigorou; Hiroi, Zenji

doi:10.7566/jpsj.89.053701

Cited by 10 publications

(4 citation statements)

References 29 publications

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“…The result is consistent with the line-nodal spin-triplet-dominant superconductivity for x 0.8 observed by many experiments [102][103][104][105][106][107][108]. A similar enhancement of spin-triplet pairing was recently observed in Cd 2 Re 2 O 7 in the vicinity of the parity-violating structural transition [116]. Now we comment on the s + p + f -wave superconductivity of Li 2 Pt 3 B proposed in Ref.…”

Section: LI 2 (Pd Pt) 3 Bsupporting

confidence: 92%

Superconductivity induced by fluctuations of momentum-based multipoles

Sumita

Yanase

2020

Phys. Rev. Research

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Recent studies of unconventional superconductivity have focused on charge or spin fluctuation, instead of electron-phonon coupling, as an origin of attractive interaction between electrons. On the other hand, a multipole order, which represents electrons' degrees of freedom in strongly correlated and spin-orbitcoupled systems, has recently been attracting much attention. Stimulated by this background, we investigate multipole-fluctuation-mediated superconductivity, which proposes a new pairing mechanism of unconventional superconductivity. Indeed, previous works have shown spin-triplet superconductivity induced by fluctuations of odd-parity electric multipole orders in isotropic systems. In this study, we establish a general formulation of the multipole-fluctuation-mediated superconductivity for all multipole symmetries, in both isotropic and crystalline systems. As a result, we reveal various anisotropic pairings induced by odd-parity and/or higher-order multipole fluctuations, which are beyond the ordinary charge or spin fluctuations. Topological superconductivity due to the mechanism is also discussed. Based on the obtained results, we discuss unconventional superconductivity in doped SrTiO 3 , PrTi 2 Al 20 , Li 2 (Pd, Pt) 3 B, and magnetic multipole metals.

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Section: LI 2 (Pd Pt) 3 Bsupporting

confidence: 92%

Superconductivity induced by fluctuations of momentum-based multipoles

Sumita

Yanase

2020

Phys. Rev. Research

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“…Therefore, the 13 C-NMR results suggest the possibility that EtMe 3 P[Pd(dmit) 2 ] 2 is a spin-triplet superconductor under pressure. If this is the case, then this organic system has considerably high T c among the spin-triplet superconductor candidates [47][48][49][50][51][52][53][54][55][56][57][58][59][60].…”

Section: Discussionmentioning

confidence: 99%

Absence of spin susceptibility decrease in a bulk organic superconductor with triangular lattice

Saitou,

Ichikawa,

Yamamoto

et al. 2022

Preprint

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The study of non-s-wave unconventional superconductivities in strongly correlated-electron systems has been a central issue in condensed matter physics for more than 30 years. In such unconventional superconductivities, d-wave Cooper pairing with antiparallel spins has been often observed in various quasi-two-dimensional (quasi-2D) bulk systems. Interestingly, many theories predicted that the triangular lattice causes the d-wave pairing to be unstable and may lead to more exotic pairing such as parallel spin (spin-triplet) pairing. Here we focus on a bulk organic triangular-lattice system in which superconductivity emerges near a nonmagnetic Mott insulating phase. We demonstrate, by using low-power nuclear magnetic resonance (NMR) measurements, that the spin susceptibility of the superconducting state retains the normal state value even deep in the superconducting state. This result indicates the possibility that the material exhibits spin-triplet superconductivity. Our finding will bring insights also into understanding the 2D materials with triangular moiré superlattices that are considered also to show unconventional superconductivities near Mott-like insulating states.

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“…The estimate may be demonstrated by incorporating chemical or physical operation, which tunes the paritymixing effect [67,68]. Furthermore, the anomalous NRO response is in close relation with the temporal symmetry preserved in superconductors.…”

Section: Discussion and Summarymentioning

confidence: 99%

Nonreciprocal optical response in parity-breaking superconductors

Watanabe,

Daido,

Yanase

2021

Preprint

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Superconductivity, an emergence of a macroscopic quantum state, gives rise to unique electromagnetic responses leading to perfect shielding of magnetic field and zero electrical resistance. In this paper, we propose that superconductors with the space-inversion symmetry breaking host giant nonreciprocal optical phenomena, such as photocurrent generation and second harmonic generation. The nonreciprocal optical responses show divergent behaviors in the low-frequency regime and originate from two-fold indicators unique to parity-breaking superconductors, namely, the nonreciprocal superfluid density and the Berry curvature derivative. Furthermore, the mechanism and frequency dependence are closely tied to the preserved temporal symmetry in the superconductor. The relation is useful for probing the space-time structure of the superconducting symmetry. The indicators characterize the low-frequency property of nonreciprocal optical responses and hence quantify the performance of superconductors in nonreciprocal optics.

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Variation in Superconducting Symmetry Against Pressure on Noncentrosymmetric Superconductor Cd₂Re₂O₇ Revealed by ^185/187Re Nuclear Quadrupole Resonance

Cited by 10 publications

References 29 publications

Superconductivity induced by fluctuations of momentum-based multipoles

Superconductivity induced by fluctuations of momentum-based multipoles

Absence of spin susceptibility decrease in a bulk organic superconductor with triangular lattice

Nonreciprocal optical response in parity-breaking superconductors

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