Research: Fe pnictides

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		With Tc values up to 55 K, the Fe arsenides have attracted considerable recent attention. The key structural element appears to be a square planar arrangement of Fe ions, tetrahedrally coordinated by As, as exemplified by BaFe2As2 shown above. Parent compounds are antiferromagnetic, but suppression of the long range magnetic order leads to superconducting behavior (as illustrated for the case of Co-doping above). Related phosphides are either paramagnetic (BaFe2P2) or superconducting (LaFePO). Our research seeks to address the nature of the magnetic and superconducting states in these families of compounds, and to explore the range of occurrence of superconductivity. Experiments emphasize magnetotransport and quantum oscillations to determine Fermi surface topology and quasiparticle properties.
Recent publications
Electronic structure of the iron-based superconductor LaOFeP Fermi Surface of Superconducting LaFePO Determined from Quantum Oscillations Determination of the phase diagram of Co-doped BaFe2As2 Neutron scattering study of the interplay between structure and magnetism in Co-doped BaFe2As2 Charge dynamics of the spin density wave state in BaFe2As2 Evidence for a Nodal-Line Superconducting State in LaFePO ARPES studies of the electronic structure of LaOFe(P,As) Quantum oscillation studies of the Fermi surface of LaFePO Topological Change of the Fermi Surface in Ternary Iron Pnictides with Reduced c/a Ratio: A de Haas-van Alphen Study of CaFe2P2 Electronic structure of the BaFe2As2 family of iron-pnictide superconductors Evidence for weak electronic correlations in iron pnictides Fermi Surface of SrFe2P2 Determined by the de Haas-van Alphen Effect Quantum oscillations in the parent pnictide BaFe2As2: Itinerant electrons in the reconstructed state Evidence for a Nodal Energy Gap in the Iron-Pnictide Superconductor LaFePO from Penetration Depth Measurements by Scanning SQUID Susceptometry Unconventional electronic reconstruction in undoped (Ba,Sr)Fe2As2 across the spin density wave transition
Contacts
Jiun-Haw Chu James Analytis Ian Fisher
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