Physics – Condensed Matter – Superconductivity
Scientific paper
2011-12-08
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures
Scientific paper
We have carried out a pressure study of the unconventional superconductor FeTe0.6Se0.4 up to 1.5 GPa by neutron scattering, resistivity and magnetic susceptibility measurements. We have extracted the neutron spin resonance energy and the superconducting transition temperature as a function of applied pressure. Both increase with pressure up to a maximum at ~1.3 GPa. This analogous qualitative behavior is evidence for a correlation between these two fundamental parameters of unconventional superconductivity. However, Tc and the resonance energy do not scale linearly and thus a simple relationship between these energies does not exist even in a single sample. The renormalization of the resonance energy relative to the transition temperature is here attributed to an increased hybridization. The present results appear to be consistent with a pressure-induced weakening of the coupling strength associated with the fundamental pairing mechanism.
Christianson Andrew D.
dos Santos Antonio M.
Fernandez-Baca Jaime A.
Lumsden Mark D.
Maier Thomas A.
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