Emergent Magnetism, Heavy Electrons, and Pressure‐Induced Reentrant Superconductivity in the Iron Substituted 4d Transition‐Metal Sulfides

ABSTRACT Superconductivity emerging from or in the vicinity of magnetic states is generally considered to be mediated by spin fluctuations and thus lies beyond the scope of conventional electron‐phonon coupled BCS framework. Here we report the emergence of novel ferromagnetism in the d ‐electron rhodium sulfide Rh 17 S 15 superconductor, characterized by an enhanced Sommerfeld coefficient γ arising from the flat topological band and many‐body correlations. We further demonstrate that the ferromagnetism can be tuned via Fe substitution at the Rh sites, leading to a spin glass ground state induced by the competing ferromagnetic and antiferromagnetic exchange interactions. Fe doping results in a further enhancement of both the γ and electron effective masses. At a doping level of x = 0.67 in Rh 17‐ x Fe x S 15 , γ reaches 312 mJ mol −1 K −2 , second only to the well‐documented d ‐electron heavy‐fermion material LiV 2 O 4 . Furthermore, upon applying pressure, superconductivity is first suppressed; under high pressures, however, we observe the reentrant superconductivity in both pristine and Fe‐doped samples. Our results not only demonstrate the unusual magnetic states and possible heavy‐fermion features in these frustration‐free, d ‐based superconductors, but also suggest that the superconductivity in this system is likely mediated by the intrinsic spin fluctuations and may thus be unconventional.

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Publication Details

Journal
Advanced Science
Published
2026-08-27
DOI
https://doi.org/10.1002/advs.77431
Primary Topic
Iron-based superconductors research
Type
article
Field-Weighted Citation Impact
0.00

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article

Emergent Magnetism, Heavy Electrons, and Pressure‐Induced Reentrant Superconductivity in the Iron Substituted 4d Transition‐Metal Sulfides

Raman Sankar, Xiaofeng Xu, Chunqiang Xu, Xiangzhuo Xing et al.
Advanced Science
Iron-based superconductors research
article

Emergent Magnetism, Heavy Electrons, and Pressure‐Induced Reentrant Superconductivity in the Iron Substituted 4d Transition‐Metal Sulfides

Raman Sankar, Xiaofeng Xu, Chunqiang Xu, Xiangzhuo Xing, Wen‐Chin Lin, Boning Yu, Lu 路 Xin 辛, Bin Li, Haiyang Yang, Xiaobing Liu, Wei Zhou, Shiyan Li, Yalei Huang, Na Zuo, Michael Smidman, Dong Qian, Dhanarajagopal Alltrin, Jianhui Dai, Bin Qian
article en

Abstract

ABSTRACT Superconductivity emerging from or in the vicinity of magnetic states is generally considered to be mediated by spin fluctuations and thus lies beyond the scope of conventional electron‐phonon coupled BCS framework. Here we report the emergence of novel ferromagnetism in the d ‐electron rhodium sulfide Rh 17 S 15 superconductor, characterized by an enhanced Sommerfeld coefficient γ arising from the flat topological band and many‐body correlations. We further demonstrate that the ferromagnetism can be tuned via Fe substitution at the Rh sites, leading to a spin glass ground state induced by the competing ferromagnetic and antiferromagnetic exchange interactions. Fe doping results in a further enhancement of both the γ and electron effective masses. At a doping level of x = 0.67 in Rh 17‐ x Fe x S 15 , γ reaches 312 mJ mol −1 K −2 , second only to the well‐documented d ‐electron heavy‐fermion material LiV 2 O 4 . Furthermore, upon applying pressure, superconductivity is first suppressed; under high pressures, however, we observe the reentrant superconductivity in both pristine and Fe‐doped samples. Our results not only demonstrate the unusual magnetic states and possible heavy‐fermion features in these frustration‐free, d ‐based superconductors, but also suggest that the superconductivity in this system is likely mediated by the intrinsic spin fluctuations and may thus be unconventional.

Advanced Science
National Taiwan Normal University (TW), Ningbo University of Technology (CN), Hangzhou Normal University (CN), Shanghai Jiao Tong University (CN), Qufu Normal University (CN), Suzhou University of Technology (CN), Fudan University (CN), Entrepreneurship Development Institute of India (IN), Suzhou University of Science and Technology (CN), Nanjing University of Posts and Telecommunications (CN), Jiangsu Province Blood Center (CN), Institute of Physics, Academia Sinica (TW), Hangzhou Dianzi University (CN), Zhejiang University of Technology (CN), Zhejiang University (CN)
National Natural Science Foundation of China, Academia Sinica, China Postdoctoral Science Foundation, Government of Jiangsu Province, Natural Science Foundation of Jiangsu Province, National Science and Technology Council, Natural Science Foundation of Zhejiang Province
Openalex Percentile: Top 27%
Iron-based superconductors research
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