Superconductivity on the Border of Weak Itinerant Ferromagnetism in UCoGe
Open accessAbstract
We report the coexistence of ferromagnetic order and superconductivity in UCoGe at ambient pressure. Magnetization measurements show that UCoGe is a weak ferromagnet with a Curie temperature T(C)=3 K and a small ordered moment m(0)=0.03 micro(B). Superconductivity is observed with a resistive transition temperature T(s)=0.8 K for the best sample. Thermal-expansion and specific-heat measurements provide solid evidence for bulk magnetism and superconductivity. The proximity to a ferromagnetic instability, the defect sensitivity of T(s), and the absence of Pauli limiting, suggest triplet superconductivity mediated by critical ferromagnetic fluctuations.
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The spin-fluctuation model for SCFP is similar to field-reinforced superconductivity observed in ferromagnetic superconductors UCoGe and URhGe.
“Another proposed explanation is that SCFP is stabilized by ferromagnetic fluctuations2, similar to field-reinforced superconductivity observed in ferromagnetic superconductors UCoGe50 and URhGe51 (Fig. 4).”
From Orphan high field superconductivity in non-superconducting uranium ditelluride (2024) · cites this paper as [50]
The paper suggests that ferromagnetic fluctuations may mediate superconductivity in UCoGe (p. 1), but it does not report field-reinforced superconductivity there. Instead, its measurements state that a 1 T field suppresses superconductivity (p. 3). The citation attached to UCoGe therefore does not support the field-reinforcement claim. (LLM, conf=0.86)
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Experimental — accuracy not yet measuredUTe2 strongly differs from the superconductors described by the spin-fluctuation model; these materials exhibit both long range magnetic order and low-field superconductivity which precede a field-reentrant superconducting phase.
“However, UTe2 strongly differs from the superconductors described by the spin-fluctuation model; these materials exhibit both long range magnetic order and low-field superconductivity which precede a field-reentrant superconducting phase50,51”
From Orphan high field superconductivity in non-superconducting uranium ditelluride (2024) · cites this paper as [50]
The UCoGe paper reports bulk ferromagnetic order coexisting with superconductivity at ambient pressure (pp. 1, 4), supporting the magnetic-order and low-field-superconductivity parts. It does not report a field-reentrant phase in UCoGe: superconductivity is suppressed at 1 T (p. 3). Its discussion of field-induced superconductivity concerns URhGe instead (p. 4). (LLM, conf=0.88)
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Research works printed but not linked: 2
- [10]B. Lloret, Ph.D. Thesis (University Bordeaux I, 1988).
- [15]T. Moriya, Spin fluctuations in itinerant electron magnetism (Springer, Berlin, 1985).
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- Authors
- Huy, N. T., Gasparini, A., de Nijs, D. E., Huang, Y., Klaasse, J. C. P., Gortenmulder, T., de Visser, A., Hamann, A., Görlach, T., & Löhneysen, H. V.
- Affiliations
- Van der Waals-Zeeman Institute (NL)
- Karlsruhe Institute of Technology (DE)
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2007-08-10
- Volume
- 99
- Issue
- 6
- Pages
- 067006-067006
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2137673253
- Cited by
- 573
- References
- 0
- Citations by year
- 2026: 17 · 2025: 17 · 2024: 27 · 2023: 28 · 2022: 34 · 2021: 49 · 2020: 30 · 2019: 40 · 2018: 26 · 2017: 30 · 2016: 38 · 2015: 40 · 2014: 37 · 2013: 23 · 2012: 31
- FWCI
- 20.68
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Physical Review Letters (publishedVersion, cc-by)
- PubMed (publishedVersion)
- UvA-DARE (University of Amsterdam) (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Rare-earth and actinide compounds
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Magnetic and transport properties of perovskites and related materials
- Keywords
- UCoGe, itinerant ferromagnetism, weak ferromagnetism, Curie temperature, ordered magnetic moment, superconducting transition temperature, ferromagnetic instability, spin-triplet superconductivity, defect sensitivity, uranium intermetallic compounds
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