Neutron scattering studies of the interplay between magnetism and unconventional superconductivity

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Date/Time:Thursday, 08 Sep 2011 - Thursday, 08 Sep 2011
Location:Room 5 Physics
Channel:Condensed Matter Physics
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Dr. Karol Marty
Oak Ridge National Laboratory

A striking particularity of unconventional superconductivity is its coupling with magnetism, as illustrated by the phase diagrams of the different families where magnetic order exists in close proximity to superconductivity, or by the manifestation within the superconducting phase of a collective spin excitation mode observable by inelastic neutron scattering and called magnetic resonance.

As an example of this prominent connection, we will present in the first part the phase diagram of the strongly magnetic Ba(Fe1-xCrx)2As2, and compare it to different doping from the same family. In the second part, we will examine the coupling of the magnetic resonance with superconductivity upon application of pressure in the superconducting FeTe0.6Se0.4 and discuss the implications of this study.