Nodal gap structure of superconducting BaFe(AsP)from angle-resolved thermal conductivity in a magnetic field
- 18 August 2011
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 84 (6), 060507
- https://doi.org/10.1103/physrevb.84.060507
Abstract
The structure of the superconducting order parameter in the iron-pnictide superconductor BaFe(AsP) ( K) with line nodes is studied by the angle-resolved thermal conductivity measurements in a magnetic field rotated within the basal plane. We find that the thermal conductivity displays distinct fourfold oscillations with minima when the field is directed at with respect to the tetragonal axis. We discuss possible gap structures that can account for the data, and conclude that the observed results are most consistent with the closed nodal loops located at the flat parts of the electron Fermi surface with high Fermi velocity.
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This publication has 32 references indexed in Scilit:
- High-temperature superconductivity in iron-based materialsNature Physics, 2010
- Evidence for superconducting gap nodes in the zone-centered hole bands offrom magnetic penetration-depth measurementsPhysical Review B, 2010
- Line nodes in the energy gap of superconductingsingle crystals as seen via penetration depth and thermal conductivityPhysical Review B, 2010
- Evolution from non-Fermi- to Fermi-liquid transport via isovalent doping insuperconductorsPhysical Review B, 2010
- Orbital-Fluctuation-Mediated Superconductivity in Iron Pnictides: Analysis of the Five-Orbital Hubbard-Holstein ModelPhysical Review Letters, 2010
- andNMR evidence for a residual density of states at zero energy in superconductingPhysical Review B, 2010
- Thermal conductivity measurements of the energy-gap anisotropy of superconducting LaFePO at low temperaturesPhysical Review B, 2009
- Pnictogen height as a possible switch between high-nodeless and low-nodal pairings in the iron-based superconductorsPhysical Review B, 2009
- Evidence for a Nodal-Line Superconducting State in LaFePOPhysical Review Letters, 2009
- Unconventional Superconductivity with a Sign Reversal in the Order Parameter ofPhysical Review Letters, 2008