15–16 Sept 2011
Paul Scherrer Institut, Villigen, Switzerland
Europe/Zurich timezone

In-situ ARPES study of La2/3Sr1/3MnO3 / SrTiO3 thin films: Fermi Surface Topology

16 Sept 2011, 14:55
25m
WBGB/019 (Paul Scherrer Institut, Villigen, Switzerland)

WBGB/019

Paul Scherrer Institut, Villigen, Switzerland

Talk Multiple Order Parameter Systems Multiple Order Parameter Systems

Speaker

Dr Mihaela FALUB (Paul Scherrer Institut, Swiss Light Source)

Description

Hole-doped manganese perovskites La1-xSrxMnO3 (LSMO) have stimulated a renewed scientific and technological interest because of their complex electronic and magnetic properties. Angle-resolved photoemission (ARPES), which directly probes the k-dependent electronic structure, could not be used to study LSMO single crystals because of their isotropic cubic symmetry (no preferential cleaving plane). The only alternative approach is to grow high-quality thin films and measure them in-situ ARPES. Our pioneering work [1] provided essential information about the low-energy electronic structure of LSMO, such as broad dispersive peaks and the clear observation of k-dependent spectral weight at the Fermi level. Here we report the complete topology of the Fermi Surface (FS) for LSMO thin films grown on SrTiO3 substrates and discuss our data in relation to the existing theoretical calculations and ARPES results of the similar layered manganites. The FS consists of an electron pocket centered at G point, formed by the (out-of-plane) 3z2-r2 electronic states, and hole cuboids centered at M points, mainly of (in-plane) x2-y2 character. [1] M. Shi et al., Phys. Rev. B 70 (2004) 140407

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Multiple Order Parameter Systems

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Primary author

Dr Mihaela FALUB (Paul Scherrer Institut, Swiss Light Source)

Co-authors

Mr Elia Razzoli (Paul Scherrer Institut, Swiss Light Source) Dr Juraj Krempasky (Paul Scherrer Institut, Swiss Light Source) Prof. Karol Hricovini (University Cergy-Pontoise, France) Dr Luc Patthey (Paul Scherrer Institut, Swiss Light Source) Dr Milan Radovic (Paul Scherrer Institut, Swiss Light Source) Dr Ming Shi (Paul Scherrer Institut, Swiss Light Source) Dr Nicholas Plumb (Paul Scherrer Institut, Swiss Light Source)

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