Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-02-17
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1016/j.physc.2011.12.001
The paradigm, inspired by the discovery of heavy-fermion and cuprate superconductors 1, 2, is to search for unconventional superconductors in magneticmaterials nearmagnetic quantumcritical point, which has yielded fruitful results 3-6. The physics reason which underneaths the success is deliberated as the need to match the oscillatory Cooper state restricted by the Fermisurface and the effective interaction which alternates between attractive and repulsive in space and time 3. The relation between superconducting transition temperature Tc and spin resonance excitationmode 7 may be regarded as experimentally reflecting a facet of the matching process, and the organization of holes and spins into a combined "stripe order" 8 another facet. While magnetic quantum critical point is not a prerequisite condition for high-Tc superconductivity in the recently discovered iron selenide materials 9, here we show that another phase-transition, the one between a metal and an insulator, tuned by vacancy is crucial. Superconductivity occurs in the metal when Fe occupancy is tuned to be compatible with an vacancy order pattern. Since the Fermi surface topology is strongly modified in a new Brillouin zone defined by the Fe vacancy and antiferromagnetic order 10, decorating the lattice by vacancy offers a new route to high-Tc superconductivity by tailoring Fermi surface for optimal match of the Cooper state and the effective interaction.
Bao Wei
Chen Guo-Feng
Green Mark A.
He J.-B.
Huang Qingzhen
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