Volume 123, Number 5, September 2018
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||26 September 2018|
Evidence of line nodes in superconducting gap function in K2Cr3As3 from specific-heat measurements
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Beijing 100190, China
2 School of Physical Sciences, University of Chinese Academy of Sciences - Beijing 100190, China
3 Collaborative Innovation Center of Quantum Matter - Beijing 100190, China
Received: 18 June 2018
Accepted: 29 August 2018
We present low-temperature specific-heat measurements of the quasi–one-dimensional superconductors . Our result shows a sharp specific-heat jump around with , which is much larger than the BCS prediction for a weak-coupling superconductor. It indicates that this superconductor is in the strong-coupling regime. After subtracting the lattice contribution and the Schottky anomaly from the total specific-heat data, the low-temperature electronic specific heat is proportional to T2 at different fields and also proportional to at different temperatures below 2.5 K. These results indicate that line nodes are present in the superconducting gap function of .
PACS: 74.25.Bt – Thermodynamic properties / 74.20.Mn – Nonconventional mechanisms / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EPLA, 2018
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