Optical conductivity of the heavy fermion superconductor CeCoIn5

Pairing symmetry and two-fluid behavior in the heavy fermion superconductor CeCoIn5

Controllable Rashba spin-orbit interaction in artificially engineered superlattices involving the heavy-fermion superconductor CeCoIn5.

By using a molecular beam epitaxy technique, we fabricate a new type of superconducting superlattices with controlled atomic layer thicknesses of alternating blocks between the heavy-fermion superconductor CeCoIn5, which exhibits a strong Pauli pair-breaking effect, and nonmagnetic metal YbCoIn5. The introduction of the thickness modulation of YbCoIn5 block layers breaks the inversion symmetry ...

Hybrid gap structure of the heavy-fermion superconductor CeIrIn5.

The thermal conductivity kappa of the heavy-fermion superconductor CeIrIn5 was measured as a function of temperature down to T(c)/8, for current directions parallel (J parallel c) and perpendicular (J parallel a) to the tetragonal c axis. For J parallel a, a sizable residual linear term kappa(0)/T is observed, as previously, which confirms the presence of line nodes in the superconducting gap. ...

Anomalous NMR magnetic shifts in CeCoIn5

We report In and Co nuclear magnetic resonance ~NMR! measurements in the heavy fermion superconductor CeCoIn5 above and below Tc . The hyperfine couplings of the In and Co are anisotropic and exhibit dramatic changes below 50 K due to changes in the crystal field level populations of the Ce ions, suggesting localized f electrons. Below Tc the spin susceptibility is suppressed, indicating single...

Hexagonal and square flux line lattices in CeCoIn5.

Using small-angle neutron scattering, we have imaged the magnetic flux line lattice (FLL) in the d-wave heavy-fermion superconductor CeCoIn5. At low fields we find a hexagonal FLL. Around 0.6 T this undergoes what is most likely a first-order transition to square symmetry, with the nearest neighbors oriented along the gap node directions. This orientation of the square FLL is consistent with th...