Volume 116, Number 6, December 2016
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||16 February 2017|
Fully gapped superconducting state in Au2Pb: A natural candidate for topological superconductor
1 State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University - Shanghai 200433, China
2 International Center for Quantum Materials, School of Physics, Peking University - Beijing 100871, China
3 Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum Beijing 102249, China
4 Collaborative Innovation Center of Quantum Matter - Beijing 100871, China
5 Collaborative Innovation Center of Advanced Microstructures - Nanjing 210093, China
Received: 26 September 2016
Accepted: 25 January 2017
We measured the ultra-low-temperature specific heat and thermal conductivity of the Au2Pb single crystal, a possible three-dimensional Dirac semimetal with a superconducting transition temperature . The electronic specific heat can be fitted by a two-band s-wave model, which gives the gap amplitudes Δ1(0)/kBTc = 1.41 and Δ2(0)/kBTc = 5.25. From the thermal conductivity measurements, a negligible residual linear term in zero field and a slow field dependence of at low field are obtained. These results suggest that Au2Pb has a fully gapped superconducting state in the bulk, which is a necessary condition for topological superconductors if Au2Pb is indeed one.
PACS: 74.25.Bt – Thermodynamic properties / 74.25.fc – Electric and thermal conductivity
© EPLA, 2016
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.