Parity transition of spin-singlet superconductivity using sub-lattice degrees of freedom

Abstract

Recently, a superconducting (SC) transition from low-field (LF) to high-field (HF) SC states was reported in CeRh${}_2$As${}_2$, indicating the existence of multiple SC states. It has been theoretically noted that the existence of two Ce sites in the unit cell, the so-called sub-lattice degrees of freedom owing to the local inversion symmetry breaking at the Ce sites, can lead to the appearance of multiple SC phases even under an interaction inducing spin-singlet superconductivity. CeRh${}_2$As${}_2$ is considered as the first example of multiple SC phases owing to this sub-lattice degree of freedom. However, microscopic information about the SC states has not yet been reported. In this study, we measured the SC spin susceptibility at two crystallographically inequivalent As sites using nuclear magnetic resonance for various magnetic fields. Our experimental results strongly indicate a spin-singlet state in both SC phases. In addition, the antiferromagnetic phase, which appears within the SC phase, only coexists with the LF SC phase; there is no sign of magnetic ordering in the HF SC phase. The present work reveals unique SC properties originating from the locally noncentrosymmetric characteristics.

arXiv comment9 pages, 7 figures, including Supplementary Materials, selected as Editors' Suggestion

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Cited by in corpus (28)

• Discovery of magnetic phase transitions in heavy-fermion superconductor CeRh${}_2$As${}_2$
• Decoupling multi-phase superconductivity from normal state ordering in CeRh${}_2$As${}_2$
• Correlation-induced Fermi surface evolution and topological crystalline superconductivity in CeRh2As2
• Coexistence of local magnetism and superconductivity in the heavy-fermion CeRh${}_2$As${}_2$ revealed by $\mu$SR studies
• Pressure-tuned quantum criticality in the locally non-centrosymmetric superconductor CeRh${}_2$As${}_2$
• Anisotropic magnetic and quadrupolar H-T phase diagram of CeRh2As2
• Clear Reduction in Spin Susceptibility and Superconducting Spin Rotation for $H\parallel a$ in the Early-Stage Sample of Spin-Triplet Superconductor UTe${}_2$
• Exposing the odd-parity superconductivity in CeRh${}_2$As${}_2$ with hydrostatic pressure
• Origin of the non-Fermi-liquid behavior in CeRh2As2
• Unified picture of superconductivity and magnetism in CeRh${}_2$As${}_2$
• Effects of nucleation at a first-order transition between two superconducting phases: Application to CeRh${}_2$As${}_2$
• Appearance of $c$-axis magnetic moment in odd-parity antiferromagnetic state in CeRh${}_2$As${}_2$ revealed by ${}^{75}$As-NMR
• Field-induced superconductivity mediated by odd-parity multipole fluctuation
• The phase diagram of CeRh${}_2$As${}_2$ for out-of-plane magnetic field
• Inversion-asymmetric itinerant antiferromagnets by the space group symmetry
• Superconducting meron phase in locally noncentrosymmetric superconductors
• Thermodynamics, elastic anomalies and excitations in the field induced phases of CeRh2As2
• Reciprocal and nonreciprocal paraconductivity in bilayer multiphase superconductors
• Incommensuration in odd-parity antiferromagnets
• Conventional $s$-wave Superconductivity in LaRh${}_2$As${}_2$; the Analog without the 4$f$ Electrons of CeRh${}_2$As${}_2$
• Unveiling the superconducting scenario in multiphase superconductor CeRh${}_2$As${}_2$ from space-group symmetry analysis and DFT calculations
• Multipolar fluctuations from localized 4f electrons in CeRh2As2
• Magnetic Field Dependence of the Spin Susceptibility on Conventional s-wave Superconductor LaRu${}_4$P${}_{12}$ Revealed by ${}^{31}$P-NMR and ${}^{139}$La-NMR
• Composite Superconducting Orders and Magnetism in CeRh${}_2$As${}_2$
• Highly Uniform Magnetic and Electronic Environment in Non-Centrosymmetric Superconductor LaRhGe${}_3$
• Quasiclassical theory of vortex states in locally non-centrosymmetric superconductors: application to CeRh${}_2$As${}_2$
• La substitution studies on the heavy-fermion superconductor CeRh${}_2$As${}_2$
• Quantum geometric magnetic monopole and two-phase superconductivity in CeRh${}_2$As${}_2$