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SUMMARY:Surprises from 'simple' metals -- a case study of layered delafoss
 ites - Prof. Andrew Mackenzie\, Max Planck Institute for Chemical Physics 
 of Solids
DTSTART:20171019T131500Z
DTEND:20171019T141500Z
UID:TALK72043@talks.cam.ac.uk
CONTACT:Gareth Conduit
DESCRIPTION:In the decades since I did my PhD at the Cavendish\, it has wi
 dely been assumed that the basic physics of simple metals is well-understo
 od.  Discoveries made over recent years suggest that that assumption was p
 remature.  In particular\, a growing class of unpurified compounds crystal
 lised using traditional\, relatively low-tech methods show huge electron m
 ean free paths.  Prominent among these\, and featuring the simplest electr
 onic structures\, are the metallic layered delafossites PdCoO2\, PtCoO2\, 
 PdCrO2 and PdRhO2.  These are single-band metals and\, simultaneouisly\, n
 atural heterostructures between strongly - and weakly-correlated layers.  
 Amazingly\, they have mean free paths twice as large as elemental silver a
 t room temperature\, which grow to tens of microns by 4K.  I will review a
 ngle resolved photoemission measurements of their bulk and surface electro
 nic structures\, and show how the huge resistive mean free paths open the 
 way to electronic viscosity making a significant contribution to their ele
 ctrical transport properties.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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