Vortex liquid phase in the 
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-wave ferromagnetic superconductor UCoGe

Wu, Beilun; Aoki, Dai; Brison, J. P.

doi:10.1103/physrevb.98.024517

Cited by 14 publications

(17 citation statements)

References 51 publications

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“…In the SC phase, rather isotropic behavior of κ/T was observed, presumably governed by the dominant isotropic impurity effect. More fascinating behavior 131) was recently reported in the determination of H c2 detected by from the resistivity (ρ) and thermal conductivity in a transverse field H b scan. As shown in Fig.…”

Section: Attempt To Determine the Order Parametermentioning

confidence: 66%

“…The concomitant features have led to the proposal of a field-induced vortex liquid phase coupled to a change in the SC order parameter. 131) The results indicate a possible change in the vortex liquid phase for H > 7 T associated with a rotation of the SC order parameter. Note also that the broadening of the resistive transition decreases by a factor of approximately 3 after the crossing of κ and ρ curves.…”

Section: Attempt To Determine the Order Parametermentioning

confidence: 80%

“…[134][135][136]. However, taking into account the nonanalytic term in the free energy, the compressibility, and the interaction with acoustic phonons, a phase transition can switch 52,131) the QCP to the TCP. 135,137) A generalization of the idea given by Larkin and Pikin has been proposed recently, 138) with the conclusion that for a first-order transition, quantum criticality will be restored by zero-point fluctuations.…”

Section: Quantum Criticality: Tcp Qcepmentioning

confidence: 99%

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Review of U-based Ferromagnetic Superconductors: Comparison between UGe₂, URhGe, and UCoGe

2019

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The discovery in 2000 that the ferromagnetic (FM) compound UGe 2 (T Curie = 52 K at ambient pressure) becomes superconducting under a pressure of P = 1.1 GPa until it enters the paramagnetic (PM) phase above P c = 1.6 GPa was a surprise, despite the fact that such a possibility was emphasized in theory four decades ago. Successive searches for new materials (URhGe and UCoGe) led to the discovery of the coexistence of superconductivity (SC) and ferromagnetism at ambient pressure. Furthermore in UCoGe, it was found that SC survives in the PM regime from P c = 1.1 to 4 GPa. The novelty is that SC also emerges deep inside the FM regime but with strong FM fluctuations. Focus has been on low-temperature experiments under extreme conditions of magnetic field (H), pressure, and uniaxial stress. NQR and NMR experiments are unique tools to understand the interplay between the spin dynamics and the Cooper pairing. We choose to present the SC properties from the knowledge of quasiparticle dressing in the normal phase (renormalized band mass, m B plus the extra dressing originating from FM fluctuations, m * * ). In UGe 2 , strong interplay exists between Fermi surface (FS) reconstructions in the cascade of different FM and PM ground states and their magnetic fluctuations. Similar phenomena occur in URhGe and UCoGe but, at first glance, the SC seems to be driven by the FM fluctuations. The weakness of the FM interaction in these two compounds gives the opportunity to observe singular features in magnetic field scans depending on their field orientation with respect to the FM sublattice magnetization (M 0 ). We will show that for UCoGe, which has the smallest ordered moment, a longitudinal field scan (H M 0 ) leads to a drastic decrease in the FM fluctuations with direct consequences on SC properties such as the upward curvature of the upper critical field. A transverse field scan (H ⊥ M 0 ) leads to suppression of the Curie temperature, T Curie ; the consequence is a boost in FM fluctuations, which leads to a reinforcement of SC. Contrary to the two examples of Ising FM UGe 2 and UCoGe, the singularity in URhGe is the weakness of the magnetocrystalline term between the choice of ferromagnetism along the c-or b-axis; the most noteworthy feature is the detection of reentrant SC on each side of the H switch at H R from the c easy axis of magnetization to the b-axis. All the experimental results give evidence that the SC in these three materials originates from the FM fluctuations, which are amplitude modes of magnetic excitations in the FM state. Spin-triplet pairing has been anticipated in the FM superconductors and was actually observed by Knight-shift measurements in the SC state of UCoGe. Their fascinating (p, T , H) phase diagrams are now well established. Of course, a new generation of experiments will elucidate subtle effects by obtaining their SC order parameters. While the FSs of UGe 2 have been experimentally well determined, those of URhGe and UCoGe have been poorly determined, and thus a quantitative comparison with b...

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Section: Attempt To Determine the Order Parametermentioning

confidence: 66%

Section: Attempt To Determine the Order Parametermentioning

confidence: 80%

Section: Quantum Criticality: Tcp Qcepmentioning

confidence: 99%

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Review of U-based Ferromagnetic Superconductors: Comparison between UGe₂, URhGe, and UCoGe

2019

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“…5 in Ref. 36). Moreover, under H parallel to the easy axis H c2 curve shows low T enhancement indicative of the underlaying phase transition (see Fig.…”

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confidence: 91%

Theory of Spin-polarized Superconductors —An Analogue of Superfluid ³He A-phase—

Machida

2020

J. Phys. Soc. Jpn.

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It is shown theoretically that ferromagnetic superconductors, UGe2, URhGe, and UCoGe can be described in terms of the A-phase like triplet pairing similar to superfluid 3 He in a unified way, including peculiar reentrant, S-shape, or L-shape Hc2 curves. The associated double transition inevitable between the A1 and A2-phases in the H-T plane is predicted, both of which are characterized by non-unitary state with broken time reversal symmetry and the half-gap. UTe2, which has been discovered quite recently to be a spin-polarized superconductor, is analyzed successively in the same view point, pointing out that the expected A1-A2 transition is indeed emerging experimentally. Thus the four heavy Fermion compounds all together are entitled to be topologically rich solid state materials worth further investigating together with superfluid 3 He A-phase.

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“…Liquid and solid vortex matters arose with high temperature superconductivity (HTS); see for example the review of Blatter et al [28]. Actually, these vortex states are quite general and vortex solid/vortex liquid transition has been observed in very different superconductors, for example: pnictides [29], organic superconductors [30] and p-wave ferromagnetic superconductor [31]. These two vortex matter regimes called the attention of many researcher and a plethora of new features have been identified in the HTS field, for example Bragg, Bose, and splayed glasses, disentangled, entangled liquids and so on [32][33][34][35][36][37][38][39][40].…”

Section: Vortices On the Move: Temperature Effectsmentioning

confidence: 99%

Vortex dynamics controlled by local superconducting enhancement

et al. 2019

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A controlled local enhancement of superconductivity yields unexpected modifications in the vortex dynamics. This local enhancement has been achieved by designing an array of superconducting Nb nanostructures embedded in a V superconducting film. The most remarkable findings are: (i) vanishing of the main commensurability effect between the vortex lattice and the array unit cell, (ii) hysteretic behavior in the vortex dynamics, (iii) broadening of the vortex liquid phase and (iv) strong softening of the vortex lattice. These effects can be controlled and they can be quenched by reducing the Nb array superconducting performance applying an in-plane magnetic field. These results can be explained by taking into account the repulsive potential landscape created by the superconducting Nb nanostructures on which vortices move.

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Vortex liquid phase in the p -wave ferromagnetic superconductor UCoGe

Cited by 14 publications

References 51 publications

Review of U-based Ferromagnetic Superconductors: Comparison between UGe₂, URhGe, and UCoGe

Review of U-based Ferromagnetic Superconductors: Comparison between UGe₂, URhGe, and UCoGe

Theory of Spin-polarized Superconductors —An Analogue of Superfluid ³He A-phase—

Vortex dynamics controlled by local superconducting enhancement

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Vortex liquid phase in the p -wave ferromagnetic superconductor UCoGe

Cited by 14 publications

References 51 publications

Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe

Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe

Theory of Spin-polarized Superconductors —An Analogue of Superfluid 3He A-phase—

Vortex dynamics controlled by local superconducting enhancement

Contact Info

Product

Resources

About

Review of U-based Ferromagnetic Superconductors: Comparison between UGe₂, URhGe, and UCoGe

Review of U-based Ferromagnetic Superconductors: Comparison between UGe₂, URhGe, and UCoGe

Theory of Spin-polarized Superconductors —An Analogue of Superfluid ³He A-phase—