Method for Accurate Determination of the Electron Contribution: Specific Heat of Ba0.59K0.41Fe2As2

Rotundu, Costel R.; Forrest, Thomas R.; Phillips, Norman E.; Birgeneau, Robert J.

doi:10.1007/978-3-319-52675-1_23

Title: Method for Accurate Determination of the Electron Contribution: Specific Heat of Ba_0.59K_0.41Fe₂As₂

Book · Sat Mar 25 00:00:00 EDT 2017 · High-Tc Copper Oxide Superconductors and Related Novel Materials Springer Series in Materials Science

DOI:https://doi.org/10.1007/978-3-319-52675-1_23· OSTI ID:1466701

Rotundu, Costel R. ^[1]; Forrest, Thomas R. ^[2]; Phillips, Norman E. ^[3]; Birgeneau, Robert J. ^[3]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
Univ. of California, Berkeley, CA (United States); Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

Twenty two years after the opening of the field of high temperature superconductivity by Georg Bednorz and Alex Müller a new addition to this class of materials, namely the iron-pnictides and chalcogenides, perplexes the scientific community. Making use of the accumulated wisdom, a great deal of their physics has been “mapped” in record time using all available measurement techniques. Among these, specific-heat has been proven a powerful and unique technique in the study of physical properties of bulk materials, especially of superconductors. We report here specific-heat measurements on the nearly optimally doped iconic iron-arsenide superconductor Ba_0.59K_0.41Fe₂As₂. We use a new method, based on direct comparisons of α-model expressions for the electron contribution with the measured total specific heat, to extract the electron contribution. It circumvents the need in the conventional analyses for an independent, necessarily approximate, determination of the lattice contribution, which is subtracted from the total to obtain the electron contribution, and it eliminates the consequent uncertainties in the electron contribution. For Ba_0.59K_0.41Fe₂As₂ the electron density of states is comprised of contributions from two electron bands with superconducting-state energy gaps differing by a factor 3.8, with 77% coming from the band with the larger gap. The vortex-state specific heat suggests nodeless gaps. Comparison of the normal-state density of states with band-structure calculations shows an extraordinarily large effective mass enhancement, for which there is no precedent in simple metals and no theoretical explanation.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 1466701

Journal Information:: High-Tc Copper Oxide Superconductors and Related Novel Materials Springer Series in Materials Science, Vol. 255; Related Information: © 2017, Springer International Publishing AG.; ISSN 0933-033X

Country of Publication:: United States

Language:: English

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Superconducting State
Lattice Contribution
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Title: Method for Accurate Determination of the Electron Contribution: Specific Heat of Ba0.59K0.41Fe2As2

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Title: Method for Accurate Determination of the Electron Contribution: Specific Heat of Ba_0.59K_0.41Fe₂As₂