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Magnetic field-induced superconductivity in the ferromagnet URhGe
1Département de Recherche Fondamentale sur la Matière Condensée, Service de Physique Statistique, Magnétique, et Supraconductivitié, Commissariat àl'Energie Atomique (CEA), Grenoble 38054, France.
Science (New York, N.Y.)
|August 27, 2005
Summary
Superconductivity coexists with ferromagnetism in URhGe. A magnetic transition, stimulated by spin rotation excitations near a quantum phase transition, triggers a new superconducting state under high magnetic fields.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- Superconductivity and ferromagnetism coexistence is observed in some metals below the ferromagnetic transition temperature.
- The underlying material characteristics driving this coexistence remain incompletely understood.
Purpose of the Study:
- To investigate the interplay between superconductivity, ferromagnetism, and magnetic fields in URhGe.
- To elucidate the mechanisms behind the coexistence of these phenomena.
Main Methods:
- Applied high magnetic fields parallel to the crystal b axis of URhGe.
- Observed magnetic transitions and superconducting properties under varying magnetic field strengths.
Main Results:
- A magnetic transition, involving a spin axis reorientation, was identified at 12 tesla.
- A secondary superconducting state emerged in a field range around this magnetic transition.
- This new superconducting pocket exists above the initial 2 tesla field where superconductivity is suppressed.
Conclusions:
- Spin rotation excitations near a quantum phase transition appear to stimulate superconductivity.
- High magnetic fields play a crucial role in modulating the coexistence of superconductivity and ferromagnetism.
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