KIP publications

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.

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