2025Superconductivity

Two-band superconductivity in intercalated rhombohedral ZrNCl

Zhenkai Xie, Ziheng Sun, Xinmin Wang, Junying Shen, Liyuan Zhang

Superconductivity · 14, 100169 (2025)

DOI 10.1016/j.supcon.2025.100169

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Introduction

Intercalating sodium and organic molecules into layered ZrNCl produces a superconducting onset near 15 K. The upper critical field is compared along two orientations and its temperature dependence is described by a two-band model.

A closer reading

Intercalation changes the layer environment and low-energy electronic states together. The two-band argument rests on how critical-field data evolve with temperature and direction; a resistive transition by itself cannot resolve two participating bands.