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Journal Articles Physical Review Letters Year : 2018

Dimensionality Driven Enhancement of Ferromagnetic Superconductivity in URhGe


In most unconventional superconductors, like the high-T c cuprates, iron pnictides, or heavy-fermion systems, superconductivity emerges in the proximity of an electronic instability. Identifying unambig-uously the pairing mechanism remains nevertheless an enormous challenge. Among these systems, the orthorhombic uranium ferromagnetic superconductors have a unique position, notably because magnetic fields couple directly to ferromagnetic order, leading to the fascinating discovery of the reemergence of superconductivity in URhGe at a high field. Here we show that uniaxial stress is a remarkable tool allowing the fine-tuning of the pairing strength. With a relatively small stress, the superconducting phase diagram is spectacularly modified, with a merging of the low-and high-field superconducting states and a significant enhancement of the superconductivity. The superconducting critical temperature increases both at zero field and under a field, reaching 1 K, more than twice higher than at ambient pressure. This enhancement of superconductivity is shown to be directly related to a change of the magnetic dimensionality detected from an increase of the transverse magnetic susceptibility: In addition to the Ising-type longitudinal ferromagnetic fluctuations, transverse magnetic fluctuations also play an important role in the super-conducting pairing.

Dates and versions

hal-01987274 , version 1 (21-01-2019)



Daniel Braithwaite, Dai Aoki, Jean-Pascal Brison, Jacques Flouquet, Georg Knebel, et al.. Dimensionality Driven Enhancement of Ferromagnetic Superconductivity in URhGe. Physical Review Letters, 2018, 120 (3), ⟨10.1103/physrevlett.120.037001⟩. ⟨hal-01987274⟩
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