Multiband nodeless superconductivity near the charge-density-wave quantum critical point in ZrTe(3-x)Sex  

作　　者：崔珊 何兰坡 洪晓晨 朱相德 Cedomir Petrovic 李世燕 

机构地区：[1]State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials,Fudan University [2]High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China [3]Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory [4]Collaborative Innovation Center of Advanced Microstructures

出　　处：《Chinese Physics B》2016年第7期89-92,共4页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant Nos.2012CB821402 and 2015CB921401);the National Natural Science Foundation of China(Grant Nos.91421101,11422429,and 11204312);the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning,China,STCSM of China(Grant No.15XD1500200);Work at Brookhaven National Laboratory was supported by the US DOE under Contract No.DESC00112704

摘　　要：It was found that selenium doping can suppress the charge-density-wave（CDW） order and induce bulk superconductivity in ZrTe3. The observed superconducting dome suggests the existence of a CDW quantum critical point（QCP） in ZrTe3-xSex near x ≈ 0.04. To elucidate the superconducting state near the CDW QCP, we measure the thermal conductivity of two ZrTe（3-x）Sex single crystals（x = 0.044 and 0.051） down to 80 m K. For both samples, the residual linear term κ0/T at zero field is negligible, which is a clear evidence for nodeless superconducting gap. Furthermore, the field dependence of κ0/T manifests a multigap behavior. These results demonstrate multiple nodeless superconducting gaps in ZrTe（3-x）Sex,which indicates conventional superconductivity despite of the existence of a CDW QCP.It was found that selenium doping can suppress the charge-density-wave（CDW） order and induce bulk superconductivity in ZrTe3. The observed superconducting dome suggests the existence of a CDW quantum critical point（QCP） in ZrTe3-xSex near x ≈ 0.04. To elucidate the superconducting state near the CDW QCP, we measure the thermal conductivity of two ZrTe（3-x）Sex single crystals（x = 0.044 and 0.051） down to 80 m K. For both samples, the residual linear term κ0/T at zero field is negligible, which is a clear evidence for nodeless superconducting gap. Furthermore, the field dependence of κ0/T manifests a multigap behavior. These results demonstrate multiple nodeless superconducting gaps in ZrTe（3-x）Sex,which indicates conventional superconductivity despite of the existence of a CDW QCP.

关 键 词：superconductivity charge-density-wave order thermal transport measurement gap structure 

分 类 号：O511.3[一般工业技术—材料科学与工程]