Synthesizing and characterization of hole doped nickel based superconductor La$ {1-x}$Sr$ {x}$NiAsO - Condensed Matter > SuperconductivityReportar como inadecuado




Synthesizing and characterization of hole doped nickel based superconductor La$ {1-x}$Sr$ {x}$NiAsO - Condensed Matter > Superconductivity - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We report the synthesizing and characterization of the hole doped Ni-basedsuperconductor $La {1-x}Sr {x}NiAsO$. By substituting La with Sr, thesuperconducting transition temperature $T c$ is increased from 2.4 K of theparent phase $LaNiAsO$ to 3.7 K at the doping levels x= 0.1 - 0.2. The curve$T c$ versus hole concentration shows a symmetric behavior as the electrondoped samples $LaNiAsO {1-x}F {x}$. The normal state resistivity in Ni-basedsamples shows a good metallic behavior and reveals the absence of spin densitywave induced anomaly which appears in the Fe-based system at about 150 K. Halleffect measurements indicate that the electron conduction in the parent phase$LaNiAsO$ is dominated by electron-like charge carriers, while with more Srdoping, a hole-like band will emerge and finally prevail over the conduction,such a phenomenon reflects that the Fermi surface of $LaNiAsO$ comprises ofelectron pockets and hole pockets, thus the sign of charge carriers could bechanged once the contribution of hole pockets overwhelms that of electronpockets. Magnetoresistance measurements and the violation of Kohler ruleprovide further proof that multiband effect dominate the normal state transportof $La {1-x}Sr {x}NiAsO$.



Autor: Lei Fang, Huan Yang, Peng Cheng, Xiyu Zhu, Gang Mu, Hai-Hu Wen

Fuente: https://arxiv.org/







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