St Andrews Research Repository

St Andrews University Home
View Item 
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.

Hidden kagome-lattice picture and origin of high conductivity in delafossite PtCoO2

Thumbnail
View/Open
PtCoO2_text_final_version.pdf (4.726Mb)
Date
12/04/2019
Author
Usui, Hidetomo
Ochi, Masayuki
Kitamura, Sota
Oka, Takashi
Ogura, Daisuke
Rosner, Helge
W. Haverkort, Maurits
Sunko, Veronika
King, Philip David
Mackenzie, Andrew Peter
Kuroki, Kazuhiko
Funder
European Research Council
The Royal Society
Grant ID
714193
URF/R/180026
Keywords
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
NDAS
Metadata
Show full item record
Altmetrics Handle Statistics
Altmetrics DOI Statistics
Abstract
We study the electronic structure of delafossite PtCoO2 to elucidate its extremely small resistivity and high mobility. The band exhibits steep dispersion near the Fermi level despite the fact that itis formed mainly by Pt d orbitals that are typically localized. We propose a picture based on two hidden kagome-lattice-like electronic structure: one originating from Pt s + px/py orbitals, and the other from Pt d3z^2-r^2 + dxy/dx^2y^2 orbitals, each placed on the bonds of the triangular lattice. In particular, we find that the underlying Pt s + px/py bands actually determine the steepness of the original dispersion, so that the large Fermi velocity can be attributed to the large width of the Pt s + px/py band. In addition, the kagome-like electronic structure gives rise to "orbital-momentum locking" on the Fermi surface, which reduces the electron scattering by impurities. We conclude that the combination of the large Fermi velocity and the orbital-momentum locking is likely to be the origin of the extremely small resistivity in PtCoO2.
Citation
Usui , H , Ochi , M , Kitamura , S , Oka , T , Ogura , D , Rosner , H , W. Haverkort , M , Sunko , V , King , P D , Mackenzie , A P & Kuroki , K 2019 , ' Hidden kagome-lattice picture and origin of high conductivity in delafossite PtCoO 2 ' , Physical Review Materials , vol. 3 , no. 4 , 045002 . https://doi.org/10.1103/PhysRevMaterials.3.045002
Publication
Physical Review Materials
Status
Peer reviewed
DOI
https://doi.org/10.1103/PhysRevMaterials.3.045002
ISSN
2475-9953
Type
Journal article
Rights
Copyright © 2019, American Physical Society. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevMaterials.3.045002
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/17443

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

Advanced Search

Browse

All of RepositoryCommunities & CollectionsBy Issue DateNamesTitlesSubjectsClassificationTypeFunderThis CollectionBy Issue DateNamesTitlesSubjectsClassificationTypeFunder

My Account

Login

Open Access

To find out how you can benefit from open access to research, see our library web pages and Open Access blog. For open access help contact: openaccess@st-andrews.ac.uk.

Accessibility

Read our Accessibility statement.

How to submit research papers

The full text of research papers can be submitted to the repository via Pure, the University's research information system. For help see our guide: How to deposit in Pure.

Electronic thesis deposit

Help with deposit.

Repository help

For repository help contact: Digital-Repository@st-andrews.ac.uk.

Give Feedback

Cookie policy

This site may use cookies. Please see Terms and Conditions.

Usage statistics

COUNTER-compliant statistics on downloads from the repository are available from the IRUS-UK Service. Contact us for information.

© University of St Andrews Library

University of St Andrews is a charity registered in Scotland, No SC013532.

  • Facebook
  • Twitter