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 Rh17S15 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 Rh17-xFexS15, γ reaches 312 mJ mol-1K-2, second only to the well-documented d-electron heavy-fermion material LiV2O4. 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.
Versions
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BibTeX
@misc{huang2026emergent,
title = {{Emergent magnetism, heavy electrons and pressure-induced reentrant superconductivity in the iron substituted 4d transition-metal sulfides}},
author = {Yalei Huang and Lu Xin and Na Zuo and Bin Li and Wei Zhou and Dhanarajagopal Alltrin and Boning Yu and Haiyang Yang and Bin Qian and Wen-Chin Lin and Raman Sankar and Michael Smidman and Xiangzhuo Xing and Chunqiang Xu and Xiaobing Liu and Jianhui Dai and Dong Qian and Shiyan Li and Xiaofeng Xu},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.12351},
eprint = {2609.12351},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.12351},
}
RIS
TY - UNPB
TI - Emergent magnetism, heavy electrons and pressure-induced reentrant superconductivity in the iron substituted 4d transition-metal sulfides
AU - Yalei Huang
AU - Lu Xin
AU - Na Zuo
AU - Bin Li
AU - Wei Zhou
AU - Dhanarajagopal Alltrin
AU - Boning Yu
AU - Haiyang Yang
AU - Bin Qian
AU - Wen-Chin Lin
AU - Raman Sankar
AU - Michael Smidman
AU - Xiangzhuo Xing
AU - Chunqiang Xu
AU - Xiaobing Liu
AU - Jianhui Dai
AU - Dong Qian
AU - Shiyan Li
AU - Xiaofeng Xu
PY - 2026
DA - 2026/09/11
PB - arXiv
DO - 10.48550/arxiv.2609.12351
UR - https://arxiv.org/abs/2609.12351
AB - 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 Rh17S15 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 Rh17-xFexS15, γ reaches 312 mJ mol-1K-2, second only to the well-documented d-electron heavy-fermion material LiV2O4. 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.
ER -