University of Connecticut

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Condensed Matter Physics Seminar

Thursday, October 14, 2010
2:00pm – 3:30pm

Storrs Campus
Gant Science Complex P-121

Yuefeng Nie, Graduate student in the UConn Physics Department, will present, “High Temperature Superconductivity in Fe-Based Compounds.” High temperature superconductivity in Fe-based compounds has been a major area of research in condensed matter physics since these materials were discovered in 2008. One reason for this interest is their apparent connection to the still poorly understood cuprate high temperature superconductors; both are layered transition metal compounds with magnetic parent materials that are doped to make a superconductor. Another reason is that the presence of superconductivity in a compound based upon Fe, commonly associated with magnetism, suggests at a novel mechanism for superconductivity. Our work studies films of 11-type Fe-chalcogenide superconductors, the material with the simplest structure of all of the Fe-based superconductors. FeTe is a non-superconducting, magnetic parent compound for this family. Typically, FeTe is made superconducting by isovalent substitution of Se or S onto Te sites. We have found that freshly grown FeTe films have the same structure and resistivity profile as bulk samples. However, oxygen is easily and reversibly incorporated into these films causing them to become superconducting. The process of adding excess oxygen to create a superconductor is quite different from the more standard procedure of substitutionally exchanging isoelectronic Se onto Te sites. In this talk, I will discuss the surprising electronic structure of these superconducting films and what they may tell us about a universal phase diagram for Fe-based superconductivity.

More information available at: www.physics.uconn.edu

Admission Fee: None

Contact:

Dawn Rawlinson dawn.rawlinson@uconn.edu 486-4916

UConn Physics Department

Physics Department (primary), UConn Master Calendar

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