- Author
-
F. Massee
S. de Jong
Y. Huang
W.K. Siu
I. Santoso
A. Mans
A.T. Boothroyd
D. Prabhakaran
R. Follath
A. Varykhalov
L. Patthey
M. Shi
J.B. Goedkoop
M.S. Golden - Year
- 2011
- Title
- Bilayer manganites reveal polarons in the midst of a metallic breakdown
- Journal
- Nature Physics
- Volume
- 7
- Pages (from-to)
- 978-982
- Document type
- Article
- Faculty
- Faculty of Science (FNWI)
- Institute
- Van der Waals-Zeeman Institute (WZI)
- Abstract
-
The origin of colossal magnetoresistance (CMR) in manganese oxides is among the most challenging problems in condensed-matter physics today. The true nature of the low-temperature electronic phase of these materials is heavily debated. By combining photoemission and tunnelling data, we show that in the archetypal bilayer system La2−2xSr1+2xMn2O7, polaronic degrees of freedom win out across the CMR region of the phase diagram. This means that the generic ground state of bilayer manganites supports a vanishing coherent quasi-particle spectral weight at the Fermi level throughout k-space. The incoherence of the charge carriers, resulting from strong electron-lattice interactions and the accompanying orbital physics, offers a unifying explanation for the anomalous charge-carrier dynamics seen in transport, optics and electron spectroscopies. The stacking number N is the key factor for true metallic behaviour, as an intergrowth-driven breakdown of the polaronic domination to give a metal possessing a traditional Fermi surface is seen in this system.
- URL
- go to publisher's site
- Link
- Link
- Language
- English
- Persistent Identifier
- https://hdl.handle.net/11245/1.354763
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