Transport anomalies and lattice effects in superconducting Nb-doped Bi[Formula: see text]Se[Formula: see text].

IF 4.9 2区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Scientific Reports Pub Date : 2026-09-15 DOI:10.1038/s41598-026-63608-7

Yanan Li, Christian Parsons, Anand Prashant Dwivedi, William Nelson, Ryan Baumbach, Marvin A Schofield, Arneil P Reyes, Prasenjit Guptasarma

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引用次数: 0

Abstract

The interplay between symmetry-breaking orders in topological materials dictates their exotic quantum states. Here, we report a combined transport, NMR, and electron diffraction study of Nb-doped Bi[Formula: see text]Se[Formula: see text], with doping level x ([Formula: see text]). Electron diffraction reveals superlattice features and periodic lattice distortions, accompanied by a pronounced resistivity anomaly between 150 and 200 K and NMR line broadening below this temperature, consistent with a temperature-driven lattice and electronic instability. The resistivity anomaly scales with nominal Nb concentration x and coexists with superconductivity at low temperatures. While its microscopic origin remains unresolved, our observations reveal competing possibilities, including charge ordering, structural disorder, and frozen lattice distortions, highlighting the rich interplay between structure and electronic states in this system. Our results position Nb[Formula: see text]Bi[Formula: see text]Se[Formula: see text] as a tunable platform for investigating intertwined electronic and structural phenomena in topological materials.

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超导掺铌铋中的输运异常和晶格效应[公式：见文]。

拓扑材料中对称破缺序之间的相互作用决定了它们的奇异量子态。在这里，我们报道了掺杂水平x（[公式：见文]）的nb掺杂Bi[公式：见文]Se[公式：见文]的联合输运、核磁共振和电子衍射研究。电子衍射揭示了超晶格特征和周期性晶格畸变，伴随着150 - 200 K之间明显的电阻率异常和低于该温度的NMR线拓宽，与温度驱动的晶格和电子不稳定性相一致。电阻率异常以标称Nb浓度x为尺度，并与低温超导共存。虽然其微观起源仍未解决，但我们的观察揭示了竞争的可能性，包括电荷有序，结构无序和冻结晶格扭曲，突出了该系统中结构和电子态之间丰富的相互作用。我们的研究结果表明Nb[公式：见文本]Bi[公式：见文本]Se[公式：见文本]是研究拓扑材料中相互交织的电子和结构现象的可调平台。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scientific Reports Natural Science Disciplines-

CiteScore

7.50

自引率

4.30%

发文量

19567

审稿时长

3.9 months

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