Low-temperature magneto-thermal transport investigation of a Ni-based superconductor BaNi2As2: Evidence for fully gapped superconductivity

Abstract

We have performed low-temperature specific heat and thermal conductivity measurements of the Ni-based superconductor BaNi${}_2$As${}_2$ ($T_{\mathrm{c}}$ = 0.7 K) in magnetic field. In zero field, thermal conductivity shows $T$-linear behavior in the normal state and exhibits a BCS-like exponential decrease below $T_{\mathrm{c}}$. The field dependence of the residual thermal conductivity extrapolated to zero temperature is indicative of a fully gapped superconductor. This conclusion is supported by the analysis of the specific heat data, which are well fit by the BCS temperature dependence from $T_{\mathrm{c}}$ down to the lowest temperature of 0.1 K.

Physical Review Letters, to be published

References in corpus (19)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
• The BCS-like gap in superconductor SmFeAsO_0.85F_0.15
• Evolution from Itinerant Antiferromagnet to Unconventional Superconductor with Fluorine Doping in La(O_{1-x}F_{x})FeAs Revealed by ^{75}As and ^{139}La Nuclear Magnetic Resonance
• Heat Conduction in the Vortex State of NbSe_2: Evidence for Multi-Band Superconductivity
• Heat Transport in a Strongly Overdoped Cuprate: Fermi Liquid and Pure d-wave BCS Superconductor
• Microwave Penetration Depth and Quasiparticle Conductivity in PrFeAsO_1-y Single Crystals : Evidence for a Full-Gap Superconductor
• Spin-singlet superconductivity with multiple gaps in PrO0.89F0.11FeAs
• Thermal conductivity of single crystalline MgB_2
• First Order Phase Transition and Superconductivity in BaNi2As2 Single Crystals
• Nickel-based phosphide superconductor with infinite-layer structure, BaNi2P2
• Superconductivity in SrNi2As2 Single Crystals
• Nickel-based layered superconductor, LaNiOAs
• Universal Heat Transport in Sr2RuO4
• Density functional study of BaNi${}_2$As${}_2$: Electronic structure, phonons and electron-phonon superconductivity
• First order magnetic transition in single crystal CaFe${}_2$As${}_2$ detected by ${}^{75}$As NMR
• Bulk evidence for single-gap s-wave superconductivity in the intercalated graphite superconductor C${}_6$Yb

Cited by in corpus (36)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
• Doping dependence of heat transport in the iron-arsenide superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$: from isotropic to strongly $k$-dependent gap structure
• Electronic Structure of Fe-Based Superconductors
• Crossover from weak to strong pairing in unconventional superconductors
• Structure and Anisotropic Properties of BaFe2-xNixAs2 (x = 0, 1, 2) Single Crystals
• Quasiparticle Heat Transport in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$: Evidence for a k-dependent Superconducting Gap without Nodes
• Giant Phonon Softening and Enhancement of Superconductivity by Phosphorus Doping of BaNi2As2
• Sixfold enhancement of superconductivity in a tunable electronic nematic system
• A variable temperature study of the crystal and magnetic structures of the giant magnetoresistant materials LnMnAsO (Ln = La, Nd)
• Multiple nodeless superconducting gaps in noncentrosymmetric superconductor PbTaSe2 with topological bulk nodal lines
• Multiband Superconductivity of Heavy Electrons in TlNi2Se2 single crystal
• Electronic band structure, Fermi surface, and elastic properties of new 4.2K superconductor SrPtAs from first-principles calculations
• An Electronic Nematic Liquid in BaNi${}_2$As${}_2$
• Novel weak-ferromagnetic metallic state in heavily doped Ba${}_{1-x}$K${}_x$Mn${}_2$As${}_2$
• Effective carrier type and field-dependence of the reduced-Tc superconducting state in SrFe(2-x)Ni(x)As2
• Nodeless superconducting gap in electron-doped BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$ probed by quasiparticle heat transport
• Soft-phonon and charge-density-wave formation in nematic BaNi${}_2$As${}_2$
• Thermal conductivity of overdoped BaFe${}_{1.73}$Co${}_{0.27}$As${}_2$ single crystal: Evidence for nodeless multiple superconducting gaps and interband interactions
• Magnetic penetration depth in single crystals of SrPd${}_2$Ge${}_2$ superconductor
• Electronic structure of iron-based superconductors: from pnictides to chalcogenides and other similar systems
• Multi-gap nodeless superconductivity in nickel chalcogenide TlNi2Se2
• Fully gapped superconductivity in SrNi${}_2$P${}_2$
• Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped BaMn${}_2$As${}_2$
• Large negative magnetoresistance in BaMn${}_2$Bi${}_2$ antiferromagnet
• Evolution of Structure and Superconductivity in Ba(Ni${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Low-temperature thermal conductivity of BaFe2As2: Parent compound of iron-arsenide superconductors
• Fully gapped superconductivity in Ni-pnictide superconductors BaNi2As2 and SrNi2P2
• Zigzag chain structure transition and orbital fluctuations in Ni-based superconductors
• Complex structure due to As bonding and interplay with electronic structure in superconducting BaNi2As2
• Real-space Observation of Unidirectional Charge Density Wave and Complex Structural Modulation in the Pnictide Superconductor Ba${}_{1-x}$Sr${}_x$Ni${}_2$As${}_2$
• Weakness of Correlation Effect Manifestation in BaNi${}_2$As${}_2$: ARPES and LDA+DMFT study
• Charge Order Evolution of Superconducting BaNi2As2 Under High Pressure
• Absence of precursor incommensurate charge order in electronic nematic Ba0.35Sr0.65Ni2As2
• Chemical pressure tuning of competing orders in ${\text{Ba}}_{1-x}{\text{Ca}}_x{\text{Ni}}_2{\text{As}}_2$
• First-principles-based $\pm s$-wave modelling for iron-based superconductors:Studies for specific heat and nuclear magnetic relaxation rate