高压物理学报2026，Vol.40Issue(4)：1-10,10.DOI:10.11858/gywlxb.20261005
高压下LaZn1-δSb2的结构及输运性质
Crystal Structure and Transport Properties of LaZn1-δSb2 under Pressure
摘要
Abstract
In the search of new superconducting materials,some specific structural units are recognized as essential factors for the emergence of superconductivity,such as the CuO2 planes in cuprates and the Fe-As layers in iron-based superconductors.In this study,we investigate the structural and transport properties of the zinc-based 112-type compound LaZn1-δSb2 with Zn-Sb layers at both ambient and high pressures.The LaZn1-δSb2 crystallizes in a tetragonal structure with a certain amount of Zn vacancies at ambient pressure.The low-temperature physical properties exhibit paramagnetic metallic behavior,with resistivity showing anisotropy behavior,and the magnetoresistance is positive at low temperatures.Meanwhile,the hole-type Hall coefficient shows significant temperature dependence,indicating that the transport behavior is dominated by multiband effects.Under high pressures,LaZn1-δSb2 retains its tetragonal phase while undergoing a volume compression exceeding 25%.As pressure increases,the absolute value of resistance and residual resistance ratio initially decrease and then increase.Further fitting reveals that the transport behavior under pressure remains dominated by electron-phonon scattering and shows almost no pressure dependence.Notably,no superconductivity above 2 K is observed up to the highest pressure of 50.9 GPa in this study.The absence of superconductivity in LaZn1-δSb2 may be related to lattice defects induced by Zn vacancies.These results can provide useful insights for the search for new superconductivity in compounds with similar structures.关键词
高压/超导电性/LaZn1-δSb2/高压同步辐射/费米液体行为Key words
high-pressure/superconductivity/LaZn1-δSb2/high-pressure synchrotron diffraction/Fermi-liquid behavior分类
数理科学引用本文复制引用
项浙宁,李庆,闻海虎..高压下LaZn1-δSb2的结构及输运性质[J].高压物理学报,2026,40(4):1-10,10.基金项目
国家自然科学基金(12574145,12434004,11927809,12061131001) （12574145,12434004,11927809,12061131001）
