Multiband nodeless superconductivity near the charge-density-wave quantum critical point in ZrTe3-x Sex

• 作者: Cedomir Petrovic 何兰坡 崔珊 朱相德 李世燕 洪晓晨
• 来源期刊: 中国物理B（英文版）
• 关键词: superconductivity charge-density-wave order thermal transport measurement gap structure
• 年，卷（期）: 2016,（7）
• 页码范围: 077403-1-077403-4
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/25/7/077403

摘要

It was found that selenium doping can suppress the charge-density-wave (CDW) order and induce bulk supercon-ductivity in ZrTe3. The observed superconducting dome suggests the existence of a CDW quantum critical point (QCP) in ZrTe3?x Sex near x≈0.04. To elucidate the superconducting state near the CDW QCP, we measure the thermal conductivity of two ZrTe3?x Sex single crystals (x=0.044 and 0.051) down to 80 mK. For both samples, the residual linear termκ0/T at zero field is negligible, which is a clear evidence for nodeless superconducting gap. Furthermore, the field dependence ofκ0/T manifests a multigap behavior. These results demonstrate multiple nodeless superconducting gaps in ZrTe3?x Sex , which indicates conventional superconductivity despite of the existence of a CDW QCP.