| year | 2014 |
| author(s) | A. Reifenberger, M. Hempel, P. Vogt, S. Aswartham, M. Abdel-Hafiez, V. Grinenko, S. Wurmehl, S.-L. Drechsler, A. Fleischmann, C. Enss, R. Klingeler |
| title | Specific Heat of K0.71Na0.29Fe2As2 at Very Low Temperatures |
| KIP-Nummer | HD-KIP 14-16 |
| KIP-Gruppe(n) | F3,F25 |
| document type | Paper |
| Keywords (shown) | FeSL |
| source | J. Low Temp. Phys. 175, 755–763 (2014) |
| doi | 10.1007/s10909-014-1168-7 |
| Abstract (en) | A commercially available calorimeter has been used to investigate the specific heat of a high-quality K0.71Na0.29Fe2As2 single crystal.The addenda heat capacity of the calorimeter is determined in the temperature range 0.02K ≤ T ≤ 0.54K. The data of the K0.71Na0.29Fe2As2 crystal imply the presence of a large T 2 contribution to the specific heat which gives evidence of d-wave order parameter symmetry in the superconducting state. To improve the measurements, a novel design for a calorimeter with a paramagnetic temperature sensor is presented. It promises a temperature resolution of T ≈ 0.1μK and an addenda heat capacity less than 200 pJ/K at T < 100mK. |
