2016
DOI: 10.1103/physrevb.93.134520
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Electronic specific heat inBaFe2xNixAs2

Abstract: We have systematically studied the low-temperature specific heat of the BaFe2−xNixAs2 single crystals covering the whole superconducting dome. Using the nonsuperconducting heavily overdoped x = 0.3 sample as a reference for the phonon contribution to the specific heat, we find that the normal-state electronic specific heats in the superconducting samples may have a nonlinear temperature dependence, which challenges previous results in the electron-doped Ba-122 iron-based superconductors. A model based on the p… Show more

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Cited by 8 publications
(10 citation statements)
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“…The real doping level of Ni and Cr was checked by inductively coupled plasma (ICP) analysis. The actual and nominal doping levels of both Ni and Cr have linear relationships with the ratios about 0.8 and 0.7 (Table I), respectively, consistent with our previous reports 45,46,50,51 . We simply use the nominal composition to represent all samples in this paper for easy comparison with our earlier published results.…”
Section: Experiments Detailssupporting
confidence: 90%
“…The real doping level of Ni and Cr was checked by inductively coupled plasma (ICP) analysis. The actual and nominal doping levels of both Ni and Cr have linear relationships with the ratios about 0.8 and 0.7 (Table I), respectively, consistent with our previous reports 45,46,50,51 . We simply use the nominal composition to represent all samples in this paper for easy comparison with our earlier published results.…”
Section: Experiments Detailssupporting
confidence: 90%
“…Estimating Equation (2) gives the following values: for Ba(Fe 1.95 Ni 0.1 )As 2 , γ n = 27.2 mJ/mol·K 2 , and for Ba(Fe 1.92 Ni 0.16 )As 2 , γ n = 18.3 mJ/mol·K 2 . The obtained values of γ n agree quite well with the experimental data for single crystals [26,27]. In addition, one can estimate the density of states at the Fermi level from the known value of γ n , which for the Ba(Fe 0.95 Ni 0.05 ) 2 As 2 sample is N(0) = 2.83 × 10 22 eV −1 cm −3 , or N*(0) = 5.8 states/eV spin unit cell, and for Ba(Fe 0.92 Ni 0.08 ) 2 As 2 is N(0) = 1.89 × 10 22 eV −1 cm −3 or N*(0) = 18.3 states/eV × spin unit cell.…”
Section: Electronic Structure Characterizationsupporting
confidence: 84%
“…Also, we have performed the numerical analysis in dimensionless form to implement and compose qualitatively with relevant experimental data. [ 19,21,38 ]…”
Section: Resultsmentioning
confidence: 99%