M. A. Tanatar

Heat conduction in the vortex state of NbSe2: evidence for multiband superconductivity.

The thermal conductivity kappa of the layered s-wave superconductor NbSe2 was measured down to T(c)/100 throughout the vortex state. With increasing field, we identify two regimes: one with localized states at fields very near H(c1) and one with highly delocalized quasiparticle excitations at higher fields. The two associated length scales are naturally explained as multiband superconductivity, with distinct small and large superconducting gaps on different sheets of the Fermi surface. This behavior is compared to that of the multiband superconductor MgB2 and the conventional superconductor V3Si.

Unconventional London Penetration Depth in Single-Crystal Ba(Fe0.93Co0.07)2As2 Superconductors

The London penetration depth lambda(T) has been measured in single crystals of Ba(Fe0.93Co0.07)2As2. The observed low-temperature variation of lambda(T) follows a power law, Deltalambda(T) approximately T(n) with n approximately 2.4+/-0.1, indicating the existence of normal quasiparticles down to at least 0.02T(c). This is in contrast with previous penetration depth measurements on single crystals of NdFeAsO1-xFx and SmFeAsO1-xFx, which indicate an anisotropic but nodeless gap. We discuss possible explanations of the observed power law behavior.

Anisotropic upper critical field and possible Fulde-Ferrel-Larkin-Ovchinnikov state in the stoichiometric pnictide superconductor LiFeAs

Measurements of the temperature and angular dependencies of the upper critical fields

Nonexponential London penetration depth of FeAs-based superconducting RFeAsO(0.9)F(0.1) (R = La, Nd) single crystals.

H_{c2}

London penetration depth in Ba(Fesub 1-x}T{sub x}){sub 2}As{sub 2} (T = Co, Ni) superconductors irradiated with heavy ions.

of a stoichiometric single crystal LiFeAs in pulsed magnetic fields up to 50 T were performed using a tunnel diode resonator. Full

Doping dependence of heat transport in the iron-arsenide superconductor Ba(Fe(1-x)Co(x))2As2: from isotropic to a strongly k-dependent gap structure.

H^{\parallel c}_{c2}(T)

Anisotropic thermodynamic and transport properties of single-crystalline CaKFe4As4

and

Sign-reversal of the in-plane resistivity anisotropy in hole-doped iron pnictides

H^{\bot c}_{c2}(T)

A ferromagnetic insulating substrate for the epitaxial growth of topological insulators

curves with

Superconducting and normal-state properties ofAPd2As2(A = Ca, Sr, Ba) single crystals

H^{\parallel c}_{c2}(0)=17 \pm 1