Low-temperature electrical conductivity of ion-beam irradiated Bi–Sb films

IF 0.6 4区物理与天体物理 Q4 PHYSICS, APPLIED

Low Temperature Physics Pub Date : 2024-05-01 DOI:10.1063/10.0025622

A. Andrino-Gómez, M. Moratalla, A. Redondo-Cubero, N. Gordillo, M. A. Ramos

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引用次数: 0

Abstract

Bismuth-antimony alloys are among the most studied topological insulators and also have very promising thermoelectric properties. In addition, in the amorphous state they exhibit superconductivity with critical temperatures in the range 6.0–6.4 K. In this work, we have prepared and studied different polycrystalline films of Bi100–xSbx (x = 0, 5, 10, 15), and we have induced, through ion beam irradiation, significant damage in their internal structure with the aim of amorphizing the material. Specifically, we have irradiated Bi ions in the 10–30 MeV range, exploiting the capabilities of a 5 MV ion beam accelerator of tandem type. We have characterized the Bi–Sb films before and after irradiation from a morphological and structural point of view and measured their electrical resistivity from room temperature to near 2 K, to evaluate the influence of the preparation method and degree of disorder. We have found that the studied Bi–Sb system always behaves as a small energy gap semiconductor that follows the empirical Meyer–Neldel rule, which correlates the conductivity prefactor with the exponential value of the energy gap.

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离子束辐照铋-锑薄膜的低温导电性

铋锑合金是研究得最多的拓扑绝缘体之一，也具有非常有前途的热电特性。在这项工作中，我们制备并研究了不同的 Bi100-xSbx （x = 0、5、10、15）多晶薄膜，并通过离子束辐照诱导其内部结构发生重大破坏，从而使材料发生非晶化。具体来说，我们利用串联式 5 MV 离子束加速器的能力，辐照了 10-30 MeV 范围内的铋离子。我们从形态和结构的角度对辐照前后的铋锑薄膜进行了表征，并测量了它们从室温到接近 2 K 的电阻率，以评估制备方法和无序程度的影响。我们发现，所研究的铋-锑系统始终表现为一种小能隙半导体，遵循经验性的迈耶-内德尔规则，该规则将电导率前因数与能隙的指数值相关联。

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

Low Temperature Physics 物理-物理：应用

CiteScore

1.20

自引率

25.00%

发文量

138

审稿时长

3 months

期刊介绍： Guided by an international editorial board, Low Temperature Physics (LTP) communicates the results of important experimental and theoretical studies conducted at low temperatures. LTP offers key work in such areas as superconductivity, magnetism, lattice dynamics, quantum liquids and crystals, cryocrystals, low-dimensional and disordered systems, electronic properties of normal metals and alloys, and critical phenomena. The journal publishes original articles on new experimental and theoretical results as well as review articles, brief communications, memoirs, and biographies. Low Temperature Physics, a translation of the copyrighted Journal FIZIKA NIZKIKH TEMPERATUR, is a monthly journal containing English reports of current research in the field of the low temperature physics. The translation began with the 1975 issues. One volume is published annually beginning with the January issues.