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Synthesis of superconducting square planar nickelates

Julia Mundy

Assistant professor of physics and of applied physics at Harvard University

Event Details:

Wednesday, March 13, 2024
11:30am - 12:30pm PDT

Location

Stanford University
497 Lomita Mall
McCullough 115
Stanford, CA 94305
United States

This event is open to:

Alumni/Friends
Faculty/Staff
General Public
Students

Abstract: Since the discovery of high-temperature superconductivity in copper oxide materials, there have been sustained efforts to both understand the origins of this phase and discover new cuprate-like superconducting materials.  One prime materials platform has been the rare-earth nickelates; indeed, superconductivity was recently discovered in the doped compound Nd0.8Sr0.2NiO2.  Undoped NdNiO2 belongs to a series of layered square-planar nickelates with chemical formula Ndn+1NinO2n+2 and is known as the ‘infinite-layer’ (n = ∞) nickelate.  Using atomically-precise molecular-beam epitaxy, our work reports the first synthesis of this series of compounds. We observe a superconducting transition beginning at ~13 K in the optimally doped 5-layer Nd6Ni5O12 . I will also discuss our work further engineering superconductivity in this family with a combination of chemical doping, epitaxial strain and dimensionality.

Bio: Julia Mundy is an assistant professor of physics and of applied physics at Harvard University. She received an AB/AM in Chemistry and Physics from Harvard University and her Ph.D. in Applied Physics from Cornell University. Following her Ph.D. studies, she spent a year at the US Department of Education as the APS/AIP STEM Education Fellow. After a postdoctoral fellowship at UC Berkeley, she returned to Harvard University where she began as an assistant professor in 2018. Prof. Mundy's research program combines atomically-precise oxide molecular-beam epitaxy with picoscale electron microscopy imaging to design, synthesize and probe new quantum materials. She is a recipient of the 2018 APS George E. Valley, Jr. Prize for exceptional contributions by an early career physicist, the Moore Fellowship in Materials Synthesis, the Packard Fellowship, the Sloan Fellowship and the DOE Early Career and NSF CAREER awards.

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