高压下LaZn1-δSb2的结构及输运性质OA

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.