Thermodynamic properties of Ba1-xMxFe2As2 (M = La and K)

Abstract

The specific heat $C(T)$ of BaFe${}_2$As${}_2$ single crystal, electron-doped Ba${}_{0.7}$La${}_{0.3}$Fe${}_2$As${}_2$ and hole-doped Ba${}_{0.5}$K${}_{0.5}$Fe${}_2$As${}_2$ polycrystals were measured. For undoped BaFe${}_2$As${}_2$ single crystal, a very sharp specific heat peak was observed at 136 K. This is attributed to the structural and antiferromagnetic transitions occurring at the same temperature. $C(T)$ of the electron-doped non-superconducting Ba${}_{0.7}$La${}_{0.3}$Fe${}_2$As${}_2$ also shows a small peak at 120 K, indicating a similar but weaker structural/antiferromagnetic transition. For the hole-doped superconducting Ba${}_{0.5}$K${}_{0.5}$Fe${}_2$As${}_2$, a clear peak of $C/T$ was observed at $T_c$ = 36 K, which is the highest peak seen at superconducting transition for iron-based high-$T_c$ superconductors so far. The electronic specific heat coefficient $\gamma$ and Debye temperature ${\Theta }_D$ of these compounds were obtained from the low temperature data.

References in corpus (21)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Superconductivity and Phase Diagram in the Iron-based Arsenic-oxides ReFeAsO1-delta (Re = rare earth metal) without F-Doping
• Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs
• Thorium-doping induced superconductivity up to 56 K in Gd1-xThxFeAsO
• Superconductivity at 52 K in iron-based F-doped layered quaternary compound Pr[O1-xFx]FeAs
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Electron Correlations in the Low Carrier Density LaFeAsO0.89F0.11 Superconductor (Tc = 28 K)
• Magnetic and structural transitions in layered FeAs systems: AFe2As2 versus RFeAsO compounds
• Antiferromagnetic transition in EuFe${}_2$As${}_2$: A possible parent compound for superconductors
• Different resistivity response to spin density wave and superconductivity at 20 K in $C{a}_{1-x}N{a}_{x}F{e}_{2}A{s}_2$
• Superconductivity at 36 K in Gadolinium-arsenide Oxides GdO${}_{1-x}$F${}_x$FeAs
• Multi-Pion States in Lattice QCD and the Charged-Pion Condensate
• High pressure synthesis of late rare earth RFeAs(O,F) superconductors; R = Tb and Dy
• Specific heat of the iron-based high-$T_c$ superconductor SmO${}_{1-x}$F${}_x$FeAs
• Transport properties and superconductivity in $B{a}_{1-x}{M}_{x}F{e}_{2}A{s}_2$ (M=La and K) with double FeAs layers
• Nodal Gap in Fe-Based Layered Superconductor LaO_0.9F_{0.1-delta}FeAs Probed by Specific Heat Measurements

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• Thermodynamic parameters of single- or multi-band superconductors derived from self-field critical currents
• Spin excitations in the excitonic spin-density-wave state of the iron pnictides
• Heat capacity study of BaFe${}_2$As${}_2$: effects of annealing
• Microscopically derived Ginzburg-Landau theory for magnetic order in the iron pnictides
• Multi-gap superconductivity in single crystals of Ba${}_{0.65}$Na${}_{0.35}$Fe${}_2$As${}_2$: A calorimetric investigation
• Magnetic and superconducting transitions in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ studied by specific heat
• The electronic specific heat of Ba1-xKxFe2As2 (x=0 to 1.0) from 2K to 380K
• Critical current and vortex dynamics in single crystals of Ca(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
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• Spin-Density-Wave Gap with Dirac Nodes and Two-Magnon Raman Scattering in BaFe2As2
• Statistics of subgap states in $s_{\pm }$ superconductors
• High-pressure effects on isotropic superconductivity in the iron-free layered pnictide superconductor BaPd2As2
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• Study of antiferromagnetic and nematic phase transitions in $BaF{e}_2(A{s}_{1-x}{P}_x{)}_2$ by AC micro-calorimetry and SQUID magnetometry