Observation of antiferromagnetic order as odd-parity multipoles inside the superconducting phase in CeRh${}_2$As${}_2$

Abstract

Spatial inversion symmetry in crystal structures is closely related to the superconducting (SC) and magnetic properties of materials. Recently, several theoretical proposals that predict various interesting phenomena caused by the breaking of the local inversion symmetry have been presented. However, experimental validation has not yet progressed owing to the lack of model materials. Here we present evidence for antiferromagnetic (AFM) order in CeRh${}_2$As${}_2$ (SC transition temperature $T_{\mathrm{SC}}\sim 0.37$~K), wherein the Ce site breaks the local inversion symmetry. The evidence is based on the observation of different extents of broadening of the nuclear quadrupole resonance spectrum at two crystallographically inequivalent As sites. This AFM ordering breaks the inversion symmetry of this system, resulting in the activation of an odd-parity magnetic multipole. Moreover, the onset of antiferromagnetism $T_{\mathrm{N}}$ within an SC phase, with $T_{\mathrm{N}}<T_{\mathrm{SC}}$, is quite unusual in systems wherein superconductivity coexists or competes with magnetism. Our observations show that CeRh${}_2$As${}_2$ is a promising system to study how the absence of local inversion symmetry induces or influences unconventional magnetic and SC states, as well as their interaction.

6 pages, 3 figures, to be published in PRL

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Cited by in corpus (46)

• Possible quadrupole density wave in the superconducting Kondo lattice CeRh2As2
• Field-angle dependence reveals odd-parity superconductivity in CeRh${}_2$As${}_2$
• Even-odd parity transition in strongly correlated locally noncentrosymmetric superconductors : An application to CeRh${}_2$As${}_2$
• Two-dimensional XY-type Magnetic Properties of Locally Noncentrosymmetric Superconductor CeRh${}_2$As${}_2$
• Violation of the Pauli-Clogston limit in a heavy Fermion superconductor CeRh${}_2$As${}_2$ --Duality of itinerant and localized 4f electrons--
• Parity transition of spin-singlet superconductivity using sub-lattice degrees of freedom
• 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${}_2$
• Anisotropic magnetotransport properties of the heavy-fermion superconductor CeRh${}_2$As${}_2$
• Low-Temperature Thermal Conductivity of CeRh${}_2$As${}_2$
• Coexistence of near-EF flat band and van Hove singularity in a two-phase superconductor
• Fermi Surface Nesting with Heavy Quasiparticles in the Locally Noncentrosymmetric Superconductor CeRh${}_2$As${}_2$
• Spectroscopic evidence of Kondo-induced quasi-quartet in CeRh${}_2$As${}_2$
• Nonreciprocal Meissner response in parity-mixed superconductors
• Multiple superconducting phases in heavy-fermion metals
• Exploring Fermi Surface Nesting and the Nature of Heavy Quasiparticles in the Spin-Triplet Superconductor Candidate CeRh${}_2$As${}_2$
• Correlation-induced Fermi surface evolution and topological crystalline superconductivity in CeRh2As2
• Linear optical response from the odd parity Bardasis-Schrieffer mode in locally non-centrosymmetric superconductors
• Tuning the parity of superconductivity in CeRh2As2 via pressure
• Coexistence of local magnetism and superconductivity in the heavy-fermion CeRh${}_2$As${}_2$ revealed by $\mu$SR studies
• Conventional type-II superconductivity in locally non-centrosymmetric LaRh${}_2$As${}_2$ single crystals
• Pressure-tuned quantum criticality in the locally non-centrosymmetric superconductor CeRh${}_2$As${}_2$
• Kramers' degenerate magnetism and superconductivity
• Exposing the odd-parity superconductivity in CeRh${}_2$As${}_2$ with hydrostatic pressure
• Horizontal flux growth as an efficient preparation method of CeRh${}_2$As${}_2$ single crystals
• Magnetic parity violation and parity-time-reversal-symmetric magnets
• Interplay of magnetism and superconductivity in 2D extended Hubbard model
• Origin of the non-Fermi-liquid behavior in CeRh2As2
• Unified picture of superconductivity and magnetism in CeRh${}_2$As${}_2$
• Stability of Bogoliubov Fermi Surfaces within BCS Theory
• Multiphase superconductivity in PdBi2
• 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
• Inversion-asymmetric itinerant antiferromagnets by the space group symmetry
• Field-induced superconductivity mediated by odd-parity multipole fluctuation
• The phase diagram of CeRh${}_2$As${}_2$ for out-of-plane magnetic field
• Superconducting meron phase in locally noncentrosymmetric superconductors
• Phase evolution of Ce-based heavy-fermion superconductors under compression: a combined first-principle and effective-model study
• La${}_2$Rh${}_{3+\delta }$Sb${}_4$: A new ternary superconducting rhodium-antimonide
• Emergent ferromagnetic ladder excitations in heavy fermion superconductor CeSb${}_2$
• Conventional $s$-wave Superconductivity in LaRh${}_2$As${}_2$; the Analog without the 4$f$ Electrons of CeRh${}_2$As${}_2$
• Multipolar fluctuations from localized 4f electrons in CeRh2As2
• La substitution studies on the heavy-fermion superconductor CeRh${}_2$As${}_2$
• Quasiclassical theory of vortex states in locally non-centrosymmetric superconductors: application to CeRh${}_2$As${}_2$
• Composite Superconducting Orders and Magnetism in CeRh${}_2$As${}_2$
• Quantum geometric magnetic monopole and two-phase superconductivity in CeRh${}_2$As${}_2$