Calorimetric Evidence of Multiband Superconductivity in Ba(Fe0.925Co0.075)2As2

Abstract

We report on the determination of the electronic heat capacity of a slightly overdoped (x = 0.075) Ba(Fe1-xCox)2As2 single crystal with a Tc of 21.4 K. Our analysis of the temperature dependence of the superconducting-state specific heat provides strong evidence for a two-band s-wave order parameter with gap amplitudes 2D1(0)/kBTc=1.9 and 2D2(0)/kBTc=4.4. Our result is consistent with the recently predicted s+- order parameter [I. I. Mazin et al., Phys. Rev. Lett. 101, 057003 (2008)].

4 pages, 3 figures

References in corpus (16)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Effects of Co substitution on thermodynamic and transport properties and anisotropic $H_{c2}$ in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ single crystals
• Determination of the phase diagram of the electron doped superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Superconductivity and Crystal Structures of (Ba1-xKx)Fe2As2 (x = 0 - 1)
• Multiband magnetism and superconductivity in Fe-based compounds
• Low temperature specific heat of the hole-doped Ba_{0.6}K_{0.4}Fe_2As_2 single crystals and electron-doped SmFeAsO_{0.9}F_{0.1} samples
• Fully Gapped Superconducting State Based on a High Normal State Quasiparticle Density of States in Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Single Crystals
• The London penetration depth in single crystals of Ba(Fe_{1-x}Co_x)_2As_2 at various doping levels
• Possible pairing states of the Fe-based superconductors
• Specific heat of the iron-based high-$T_c$ superconductor SmO${}_{1-x}$F${}_x$FeAs
• Experimental evidence for a two-gap structure of superconducting NbSe_2: a specific heat study in external magnetic fields
• Interband superconductivity: contrasts between BCS and Eliashberg theory
• Non-exponential London penetration depth in Ba${}_{1-}$K${}_x$Fe${}_2$As${}_2$ single crystals
• Coexistence of superconductivity and a spin density wave in pnictides: Gap symmetry and nodal lines
• Spectroscopic and thermodynamic properties in a four-band model for pnictides

Cited by in corpus (69)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• High-temperature superconductivity in iron-based materials
• Ultrafast transient generation of spin-densitywave order in the normal state of BaFe2As2 driven by coherent lattice vibrations
• London Penetration Depth in Iron - based Superconductors
• Superconductivity-induced reentrance of orthorhombic distortion in Ba1-xKxFe2As2
• A review of two-band superconductivity: materials and effects on the thermodynamic and reversible mixed-state properties
• Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides
• Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe1-xCox)2As2 iron pnictides
• Electronic nematic susceptibility of iron-based superconductors
• Crossover from weak to strong pairing in unconventional superconductors
• Physical properties of FeSe${}_{0.5}$Te${}_{0.5}$ single crystals grown under different conditions
• Ultrafast transient response and electron-phonon coupling in the iron-pnictide superconductor Ba(Fe(1-x)Co(x))2As2
• Evidence for multiple superconducting gaps in optimally doped BaFe${}_{1.87}$Co${}_{0.13}$As${}_2$ from infrared spectroscopy
• Specific heat and upper critical field in KFe2As2 single crystals
• Phase Diagram and Calorimetric Properties of NaFe${}_{1-x}$Co${}_x$As
• Strong Correlations, Strong Coupling and s-wave Superconductivity in Hole-doped BaFe2As2 Single Crystals
• Complex phase diagram of Ba${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$: a multitude of phases striving for the electronic entropy
• Superconducting Properties of the $s^{\pm }$-wave state: Fe-based superconductors
• Phase diagram of iron-pnictides if doping acts as a disorder
• Effect of annealing on the specific heat of Ba(Fe1-xCox)2As2
• Ultrafast structural dynamics of the Fe-pnictide parent compound BaFe2As2
• Thermal expansion and Grüneisen parameters of Ba(Fe1-xCox)2As2 - a thermodynamic quest for quantum criticality
• Calorimetric Evidence of Strong-Coupling Multiband Superconductivity in Fe(Te0.57Se0.43) Single Crystal
• Highly anisotropic energy gap in superconducting Ba(Fe${}_{0.9}$Co${}_{0.1}$)${}_2$As${}_2$ from optical conductivity measurements
• Multi-gap superconductivity in single crystals of Ba${}_{0.65}$Na${}_{0.35}$Fe${}_2$As${}_2$: A calorimetric investigation
• Gap structure in the electron-doped Iron-Arsenide Superconductor Ba(Fe0.92Co0.08)2As2: low-temperature specific heat study
• Phase diagram and physical properties of NaFe${}_{1-x}$Cu${}_x$As single crystals
• Specific-heat study of superconducting and normal states in FeSe1-xTex (0.6<=x<=1) single crystals: Strong-coupling superconductivity, strong electron-correlation, and inhomogeneity
• Calorimetric study in single crystal of CsFe${}_2$As${}_2$
• Specific heat of Ca${}_{0.32}$Na${}_{0.68}$Fe${}_2$As${}_2$ single crystals: unconventional s${}_{\pm }$ multi-band superconductivity with intermediate repulsive interband coupling and sizable attractive intraband couplings
• Highly anisotropic superconducting gaps and possible evidence of antiferromagnetic order in FeSe single crystals
• Nodeless superconductivity in the presence of spin-density wave in pnictide superconductors: The case of BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Superfluid density measurements of Ba(CoxFe1-x)2As2 films near optimal doping
• Specific Heat Discontinuity DeltaC vs Tc in Annealed Ba(Fe1-xCox)2As2
• Two-band BCS superconductivity in Ba(Fe0.9Co0.1)2As2
• Multi-gap superconductivity in a BaFe1.84Co0.16As2 film from optical measurements at terahertz frequencies
• Competition between superconductivity and magnetic/nematic order as a source of anisotropic superconducting gap in underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Electronic structure of single-crystalline Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ probed by x-ray absorption spectroscopy: Evidence for isovalent substitution of Fe${}^{2+}$ by Co${}^{2+}$
• Low-energy interband transitions in the infrared response of Ba(Fe1-xCox)2As2
• Pressure effects on the transport coefficients of Ba(Fe1-xCox)2As2
• Two-gap superconductivity in Lu${}_2$Fe${}_3$Si${}_5$: a transverse-field muon spin rotation study
• Close correlation between magnetic properties and the soft phonon mode of the structural transition in BaFe${}_2$As${}_2$ and SrFe${}_2$As${}_2$
• Specific heat jump at superconducting transition in the presence of Spin-Density-Wave in iron-pnictides
• On the Structure of Superconducting Order Parameter in High-Temperature Fe-Based Superconductors
• Evidence for Unconventional Superconductivity and Nontrivial Topology in PdTe
• Of Substitution and Doping: Spatial and Electronic Structure in Fe Pnictides
• Doping and critical-temperature dependence of the energy gaps in Ba(Fe_{1-x}Co_x)_2As_2 thin films
• Planar hybrid superconductor-normal metal-superconductor thin film junctions based on BaFe1.8Co0.2As2
• Effect of SDW fluctuations on the specific heat jump in iron pnictides at a superconducting transition
• Vortex Structure and Anisotropic Superconducting Gaps in Ba[Fe(Ni)]${}_2$As${}_2$
• Competing Electronic Phases near the Onset of Superconductivity in Hole-doped SrFe2As2
• Fully gapped superconductivity in SrNi${}_2$P${}_2$
• Universal Scaling Law for the Condensation Energy, U, Across a Broad Range of Superconductor Classes
• Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and 75As-NMR/NQR
• `17-15' Superconductivity - Rh17S15 and Pd17Se15
• Spectroscopic Evidence for the Superconductivity of Elemental Metal Y under Pressure
• Phonon spectrum of SrFe2As2 determined using multizone phonon refinement
• Preparation of hybrid Josephson junctions on Co-doped Ba-122 single crystals
• Observation of Multiple Superconducting Gaps in the Infrared Reflectivity Spectra of Ba(Fe0.9Co0.1)2As2
• Effect of annealing on the specific heat of optimally doped Ba(Fe${}_{0.92}$Co${}_{0.08}$)${}_2$As${}_2$
• Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
• Superconducting gap evolution in overdoped BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ single crystals through nanocalorimetry
• Constraints Imposed by Symmetry on Pairing Operators for the Pnictides
• Electronic specific heat in BaFe${}_{2-x}$Ni${}_x$As${}_2$
• The Origin of Condensation Energy Scaling of the Fe-based superconductors
• Doping dependence and electron-boson coupling in the ultrafast relaxation of hot electron populations in Ba(Fe_{1-x}Co_x)_2As_2
• Enhancement of the critical current by surface irregularities in Fe-based superconductors
• Specific heat of Ba${}_{0.59}$K${}_{0.41}$Fe${}_2$As${}_2$, and a new method for identifying the electron contribution: two electron bands with different energy gaps in the superconducting state