Electronic specific heat in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>BaFe</mml:mtext><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mtext>Ni</mml:mtext><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mtext>As</mml:mtext><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Gong, Dongliang; Xie, Tao; Lu, Xingye; Ren, Cong; Shan, Lei; Zhang, Rui; Dai, Pengcheng; Yang, Yi-feng; Luo, Huiqian; Li, Shiliang

doi:10.1103/physrevb.93.134520

Cited by 8 publications

(10 citation statements)

References 48 publications

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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%

Doping effects of Cr on the physical properties of BaFe1.9−xNi0.1CrxAs2

et al. 2018

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We present a systematic study on the heavily Cr doped iron pnictides BaFe1.9−xNi0.1CrxAs2 by using elastic neutron scattering, high-resolution synchrotron X-ray diffraction (XRD), resistivity and Hall transport measurements. When the Cr concentration increases from x = 0 to 0.8, neutron diffraction experiments suggest that the collinear antiferromagnetism persists in the whole doping range, where the Néel temperature TN coincides with the tetragonal-to-orthorhombic structural transition temperature Ts, and both of them keeps around 35 K. The magnetic ordered moment, on the other hand, increases within increasing x until x = 0.5, and then decreases with further increasing x. Detailed refinement of the powder XRD patterns reveals that the Cr substitutions actually stretch the FeAs4 tetrahedron along the c−axis and lift the arsenic height away Fe-Fe plane. Transport results indicate that the charge carriers become more localized upon Cr doping, then changes from electron-type to hole-type around x = 0.5. Our results suggest that the ordered moment and the ordered temperature of static magnetism in iron pnictides can be decoupled and tuned separately by chemical doping.

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Section: Experiments Detailssupporting

confidence: 90%

Doping effects of Cr on the physical properties of BaFe1.9−xNi0.1CrxAs2

et al. 2018

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“…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%

Analysis of Electronic Properties from Magnetotransport Measurements on Ba(Fe1−xNix)2As2 Thin Films

et al. 2020

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We performed a detailed structural, magnetotransport, and superconducting analysis of thin epitaxial Ba(Fe1−xNix)2As2 films with Ni doping of x = 0.05 and 0.08, as prepared by pulsed laser deposition. X-ray diffraction studies demonstrate the high crystalline perfection of the films, which have a similar quality to single crystals. Furthermore, magnetotransport measurements of the films were performed in magnetic fields up to 9 T. The results we used to estimate the density of electronic states at the Fermi level, the coefficient of electronic heat capacity, and other electronic parameters for this compound, in their dependence on the dopant concentration within the framework of the Ginzburg–Landau–Abrikosov–Gorkov theory. The comparison of the determined parameters with measurement data on comparable Ba(Fe1−xNix)2As2 single crystals shows good agreement, which confirms the high quality of the obtained films.

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“…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%

Influence of Multi‐Orbitals and Hund's Coupling Induced Pseudogap on Specific Heat Jump in Iron‐Pnictide High T_c Superconductors

Ahalawat

Rani

Ajay

2022

Physica Status Solidi (b)

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A three‐orbital per site theoretical model study is attempted to analyze the nature of specific heat in iron‐based superconductors. Based on recent experimental data, it is found that the five Fe 3d orbitals, Hund's coupling, and intra‐ and inter‐electron orbital correlations play a significant role in the electronic properties of these systems. Thus, in the present work, a model Hamiltonian containing hopping between orbitals, Hund's coupling, and intra‐ and inter‐orbital Coulomb interactions is employed for iron pnictide. Employing Green's function technique within Bardeen–Cooper–Schrieffer (BCS) mean‐field approximation, expressions of superconducting energy gap parameter and quasiparticle energies are obtained. Considering these parameters, specific heat is calculated and its variation with temperature and other parameters of the model Hamiltonian is analyzed. Also, a pseudogap (PG) parameter, arising out of multi‐orbitals’ Hund's coupling, as supported by angle‐resolved photoemission spectroscopy and scanning tunneling microscopy experiments, is introduced. The expression of specific heat is numerically analyzed to pinpoint its variation below and above the transition temperature (T c). Self‐consistent numerical analysis of the specific heat jump as a function of multi‐orbital hopping, electron interactions, and Hund's coupling in terms of PG parameter is shown in detail. Finally, the outcomes are compared with recent theoretical and experimental data available on specific heat variations in iron superconductors like LaOFeAs system.

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Electronic specific heat inBaFe2−xNixAs2

Cited by 8 publications

References 48 publications

Doping effects of Cr on the physical properties of BaFe1.9−xNi0.1CrxAs2

Doping effects of Cr on the physical properties of BaFe1.9−xNi0.1CrxAs2

Analysis of Electronic Properties from Magnetotransport Measurements on Ba(Fe1−xNix)2As2 Thin Films

Influence of Multi‐Orbitals and Hund's Coupling Induced Pseudogap on Specific Heat Jump in Iron‐Pnictide High T_c Superconductors

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Electronic specific heat inBaFe2−xNixAs2

Cited by 8 publications

References 48 publications

Doping effects of Cr on the physical properties of BaFe1.9−xNi0.1CrxAs2

Doping effects of Cr on the physical properties of BaFe1.9−xNi0.1CrxAs2

Analysis of Electronic Properties from Magnetotransport Measurements on Ba(Fe1−xNix)2As2 Thin Films

Influence of Multi‐Orbitals and Hund's Coupling Induced Pseudogap on Specific Heat Jump in Iron‐Pnictide High Tc Superconductors

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Influence of Multi‐Orbitals and Hund's Coupling Induced Pseudogap on Specific Heat Jump in Iron‐Pnictide High T_c Superconductors