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

Haowen Han; Yusong Zhao; Yi Bian; Tong Ma; Wenlong Yang; Shaohua Yang; Binghui Ge; Hongliang Dong; Chuanying Xi; Ze Wang; Nuofu Chen; Tian Shang; Toni Shiroka; Zaher Salman; Jia-Cai Nie; Ho-Kwang Mao; Jikun Chen

arXiv · 2511.22026

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

Haowen Han·Yusong Zhao·Yi Bian·Tong Ma·Wenlong Yang·Shaohua Yang·Binghui Ge·Hongliang Dong·Chuanying Xi·Ze Wang·Nuofu Chen·Tian Shang·Toni Shiroka·Zaher Salman·Jia-Cai Nie·Ho-Kwang Mao·Jikun Chen

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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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Haowen Han, Yusong Zhao, Yi Bian, Tong Ma, Wenlong Yang, Shaohua Yang, Binghui Ge, Hongliang Dong, Chuanying Xi, Ze Wang, Nuofu Chen, Tian Shang, Toni Shiroka, Zaher Salman, Jia-Cai Nie, Ho-Kwang Mao, Jikun Chen. 2025-11-27. A chemical avenue to manipulate field-reentrant superconducting rivalries in infinite layer nickelates. https://arxiv.org/abs/2511.22026

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