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Materials Science Division

Mechanism of Superconductivity in Cuprates and Unconventional Superconductors

Our current research focuses on determining the structural and magnetic phase diagrams and the competing/coexisting order of superconductivity and magnetism in cuprates and iron-based superconductors.

These studies include: the evolution of spin fluctuations with temperature and doping; the influence of spin-phonon coupling on enhancing superconductivity; the exploration of unusual phenomena at interfaces between strongly correlated materials, such as cuprate superconductors and manganites; and the origin of charge-density wave order  and its suppression related to the onset of superconductivity and other novel phenomena in a variety of systems. These studies utilize major neutron and synchrotron X-ray scattering facilities, as well as local specific heat, magnetization and magneto-transport measurements in conjunction with doping and irradiation tuned defects of the materials.

Phase diagram of hole doped Sr1-xNaxFe2As2 determined from neutron and synchrotron x-ray powder diffraction and bulk measurements reveals the presence of a novel tetragonal magnetic C4 phase within the nematic C2 stripe antiferromagnetic phase.