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Specific Heat of Ca0.33Na0.67Fe2As2

The specific heat of single crystal hole-doped Ca0.33Na0.67Fe2As2, Tc(onset)=33.7 K, was measured from 0.4 to 40 K. The discontinuity in the specific heat at Tc, deltaC, divided by Tc is 105 +- 5 mJ/molK2, consistent with values found previously for hole-doped Ba0.6K0.4Fe2As2 and somewhat above the general trend for deltaC/Tc vs Tc for the iron based superconductors established by Bud'ko, Ni and Canfield. The usefulness of measured valued of deltaC/Tc as an important metric for the quality of samples is discussed.

preprint2014arXivOpen access
J. S. KimK. ZhaoC. Q. JinG. R. Stewart
cond-mat.supr-con
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Open access4 authors1 topic
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J. S. KimK. ZhaoC. Q. JinG. R. Stewart

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