J.-Ph. Reid

Universal Heat Conduction in the Iron Arsenide Superconductor KFe2As2: Evidence of a d-Wave State

The thermal conductivity κ of the iron arsenide superconductor KFe2As2 was measured down to 50 mK for a heat current parallel and perpendicular to the tetragonal c axis. A residual linear term at T→0, κ(0)/T is observed for both current directions, confirming the presence of nodes in the superconducting gap. Our value of κ(0)/T in the plane is equal to that reported by Dong et al. [Phys. Rev. Lett. 104, 087005 (2010)] for a sample whose residual resistivity ρ(0) was 10 times larger. This independence of κ(0)/T on impurity scattering is the signature of universal heat transport, a property of superconducting states with symmetry-imposed line nodes. This argues against an s-wave state with accidental nodes. It favors instead a d-wave state, an assignment consistent with five additional properties: the magnitude of the critical scattering rate Γ(c) for suppressing T(c) to zero; the magnitude of κ(0)/T, and its dependence on current direction and on magnetic field; the temperature dependence of κ(T).

Nodes in the gap structure of the iron arsenide superconductor Ba ( Fe 1 − x Co x ) 2 As 2 from c -axis heat transport measurements

The thermal conductivity

From d-wave to s-wave pairing in the iron-pnictide superconductor (Ba,K)Fe2As2

\ensuremath{\kappa}

Pressure-induced Fermi-surface reconstruction in the iron-arsenide superconductor Ba 1 − x K x Fe 2 As 2 : Evidence of a phase transition inside the antiferromagnetic phase

of the iron-arsenide superconductor

Wiedemann-Franz law and nonvanishing temperature scale across the field-tuned quantum critical point of YbRh2Si2

\text{Ba}{({\text{Fe}}_{1\ensuremath{-}x}{\text{Co}}_{x})}_{2}{\text{As}}_{2}

Doping evolution of the superconducting gap structure in the underdoped iron arsenide Ba 1 − x K x Fe 2 As 2 revealed by thermal conductivity

was measured down to 50 mK for a heat current parallel

Interplane resistivity of underdoped single crystals (Ba1-xKx)Fe2As2(0<= x < 0.34)

({\ensuremath{\kappa}}_{c})

Competition between superconductivity and magnetic/nematic order as a source of anisotropic superconducting gap in underdoped Ba1-xKxFe2As2

and perpendicular

Isotropic three-dimensional gap in the iron arsenide superconductor LiFeAs from directional heat transport measurements

({\ensuremath{\kappa}}_{a})

Quantum critical quasiparticle scattering within the superconducting state of CeCoIn5

to the tetragonal