Chiral superconductivity in nematic states

Takamatsu, Shuhei; Yanase, Youichi

doi:10.1103/physrevb.91.054504

Cited by 2 publications

(2 citation statements)

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“…This agreement also confirms the triangular symmetry of the VL made up of singly quantized vortices throughout the entire measured field range. Our data does not support theoretical predictions of doubly quantized vortices [36][37][38] based on E 1u pairing symmetry, or structural distortions/transitions within the B phase or associated with the B-C phase transition [39][40][41] for H c.…”

Section: Methodscontrasting

confidence: 97%

Broken time-reversal symmetry in the topological superconductor UPt3

et al. 2020

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The topological superconductor UPt3, has three distinct vortex phases, a strong indication of its unconventional character. Using small-angle neutron scattering we have probed the vortex lattice in the UPt3 B phase with the magnetic field along the crystal c-axis. We find a difference in the vortex lattice configuration depending on the sign of the magnetic field relative to the field direction established upon entering the B phase at low temperature in a field sweep, showing that the vortices in this material posses an internal degree of freedom. This observation is facilitated by the discovery of a field driven non-monotonic vortex lattice rotation, driven by competing effects of the superconducting gap distortion and the vortex-core structure. From our bulk measurements we infer that the superconducting order parameter in the UPt3 B phase breaks time reversal symmetry and exhibits chiral symmetry with respect to the c-axis.

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Section: Methodscontrasting

confidence: 97%

Broken time-reversal symmetry in the topological superconductor UPt3

et al. 2020

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“…1. Thus, we can now write down the phenomenological Ginzburg-Landau model for the superconducting degrees of freedom inside the HO phase 53 :…”

Section: A Superconducting Free Energymentioning

confidence: 99%

Phenomenological theory of the superconducting state inside the hidden-order phase ofURu2Si2

Kang

Fernandes

2015

Phys. Rev. B

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Recent experiments have unveiled important properties of the ground state of the elusive heavy fermion URu2Si2. While tetragonal symmetry-breaking was reported below the hidden-order (HO) transition at THO ≈ 17.5 K, time-reversal symmetry-breaking was observed below the superconducting transition temperature Tc < THO. Although the latter results have been used to argue in favor of a chiral d+id superconducting state, such an order parameter is incompatible with broken tetragonal symmetry. Here, we employ a phenomenological model to investigate the properties of a chiral superconducting state that develops inside the hidden-order phase. In this case, there are actually two superconducting transition temperatures: while Tc marks a normal-state to superconducting transition, T * c < Tc signals a superconducting-to-superconducting transition in which time-reversal symmetry is broken. In the phase T * c < T < Tc, the low-energy density of states ρ (ω) is enhanced due to the crossing of two nodal lines, giving rise to an unusual ω log(ω) dependence of ρ (ω), which is manifested in several thermodynamic properties. We also investigate the emergence of a soft amplitude gap mode near T * c . In contrast to the usual amplitude mode near a regular normal-state to superconducting transition, this mode becomes soft near a superconducting-to-superconducting transition, which in principle allows for its detection by Raman spectroscopy. Finally, we investigate the impact of twin domains on the anisotropic properties of the superconducting state, and propose experiments in mechanically strained samples to explore the interplay between hidden order and superconductivity in URu2Si2.

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Chiral superconductivity in nematic states

Cited by 2 publications

References 50 publications

Broken time-reversal symmetry in the topological superconductor UPt3

Broken time-reversal symmetry in the topological superconductor UPt3

Phenomenological theory of the superconducting state inside the hidden-order phase ofURu2Si2

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