Dimensionality Driven Enhancement of Ferromagnetic Superconductivity in URhGe

Daniel Braithwaite, Dai Aoki, Jean Pascal Brison, Jacques Flouquet, Georg Knebel, Ai Nakamura, Alexandre Pourret

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

In most unconventional superconductors, like the high-Tc cuprates, iron pnictides, or heavy-fermion systems, superconductivity emerges in the proximity of an electronic instability. Identifying unambiguously 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 superconducting pairing.

Original languageEnglish
Article number037001
JournalPhysical Review Letters
Volume120
Issue number3
DOIs
Publication statusPublished - 2018 Jan 17

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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