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Electrical transport and spectroscopy studies of the delafossite layered metals

Date: Monday, April 8, 2019 16:00 - 17:00
Speaker: Andrew Mackenzie (Max Planck Institute for Chemical Physics of Solids)
Location: Raiffeisen Lecture Hall, Central Building
Series: Institute colloquium
Host: Zhanybek Alpichev
Contact: Arinya Eller
Central building lecture hall

Abstract:

The delafossites, named after the French crystallographer Gabriel Delafosse, are triangular lattice layered materials with general formula ABO2.  The family includes insulators, large gap semiconductors and a few astonishingly high conductivity metals.  I will describe our group’s work on the latter, focusing on three aspects of our recent research.  Firstly, I will discuss the realization that the high electrical conductivity results from a degree of crystalline purity that is highly unusual in a multi-component oxide, and in the second part of the talk I will describe novel spectroscopic signatures that arise from studying angle-resolved photoemission (ARPES) from the layered Mott insulator – metal system PdCrO2.   I will close by describing the discovery of what we believe to be an entirely new quantum coherent phenomenon in the inter-layer transport of PdCoO2 and PtCoO2.

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