A chemical avenue to manipulate field-reentrant superconducting competition in infinite layer nickelates

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ID: 322646
2026
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Abstract
Abstract Recently, preliminary magnetic field-reentrant superconductivity manifested in high-temperature (Tc) Eu-doped infinite-layer (IL) nickelates, beyond analogous discoveries exclusively in low-Tc systems. This evokes intriguing fundamental issues about potential quantum-phase boundary and criticality between unconventional superconductivity and field-reentrant-one, which are inexplicable owing to formidable challenges in growing IL-nickelates towards later-series rare-earths. Herein, we open up chemical avenues to enable effective growth of (RE1-yRE'y)1-xEuxNiO2 (RE/RE': Pr, Nd, Sm, Gd, Dy), giving rise to discoveries of RE-4f-related quantum competition between high-Tc and reentrant superconductivity. Robust magnetic-field-reentrant superconductivity with uniaxial anisotropy is observed at superconducting-dome boundaries, stemming from Eu2+-4f7 associated competition between magnetic-fluctuation promoted pairing and exchange-field interactions. Their quantum-criticality is further modulable via RE(RE’)-magnetism, which either reinforces reentrancy or elevates Tc (∼40.1 K) with more robust critical-current-density (∼266 kA/cm2 at 2 K) beyond Sr-/Ca-doped counterparts. Our synthetic route enables the establishment of an ideal platform via IL-nickelates for studying 4f-related unconventional superconductivity and quantum-criticality.
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Authors Haowen Han, Yusong Zhao, Yi Bian, Ma Tc, Wenlong Yang, Shaohua Yang, Binghui Ge, Hongliang Dong, Chuanying Xi, Zi Wang, Nuofu Chen, Tian Shang, Toni Shiroka, Zaher Salman, Jia-Cai Nie, Ho-Kwang Mao, Jikun Chen
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Journal national science review
Year 2026
DOI
10.1093/nsr/nwag457
URL
https://doi.org/10.1093/nsr/nwag457
Keywords Keywords not found

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