Multiband nodeless superconductivity near the charge-density-wave quantum critical point in ZrTe_(3-x)Se_x |
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| Institution: | 1.State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China;2.High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei 230031, China;3.Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;4.Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA |
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| Abstract: | 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 ZrTe3-xSex single crystals (x = 0.044 and 0.051) down to 80 mK. 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 ZrTe3-xSex, which indicates conventional superconductivity despite of the existence of a CDW QCP. |
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| Keywords: | superconductivity charge-density-wave order thermal transport measurement gap structure |
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