Iorio, Alfredo (2010) Electron-lattice and strain effects in manganite heterostructures. [Tesi di dottorato] (Unpublished)

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Item Type: Tesi di dottorato
Language: English
Title: Electron-lattice and strain effects in manganite heterostructures
Creators:
CreatorsEmail
Iorio, Alfredoialfredo@na.infn.it
Date: 29 November 2010
Number of Pages: 69
Institution: Università degli Studi di Napoli Federico II
Department: Scienze fisiche
Doctoral School: Scienze fisiche
PHD name: Fisica fondamentale ed applicata
PHD cycle: 23
PHD Coordinator:
nameemail
Marrucci, Lorenzolorenzo.marrucci@na.infn.it
Tutor:
nameemail
Cataudella, Vittoriovittorio.cataudella@na.infn.it
Date: 29 November 2010
Number of Pages: 69
Uncontrolled Keywords: manganite; heterostructures; strain; electron-lattice
MIUR S.S.D.: Area 02 - Scienze fisiche > FIS/03 - Fisica della materia
Date Deposited: 08 Dec 2010 15:29
Last Modified: 30 Apr 2014 19:44
URI: http://www.fedoa.unina.it/id/eprint/8121

Abstract

A correlated inhomogeneous mean-field approach is proposed in order to study a tight-binding model of the manganite heterostructures (LaMnO3)2n/(SrMnO3)n with average hole doping x =1/3. Phase diagrams, spectral and optical properties of large heterostructures (up to 48 sites along the growth direction) with a single interface are discussed analyzing the effects of electron-lattice anti-adiabatic fluctuations and strain. The formation of a metallic ferromagnetic interface is quite robust with varying the strength of electron-lattice coupling and strain, though the size of the interface region is strongly dependent on these interactions. The density of states never vanishes at the chemical potential due to the formation of the interface, but it shows a rapid suppression with increasing the electron-lattice coupling. The in-plane and out-of-plane optical conductivities show sharp differences since the in-plane response has metallic features, while the out-of-plane one is characterized by a transfer of spectral weight to high frequency. The in-plane response mainly comes from the region between the two insulating blocks, so that it provides a clear signature of the formation of the metallic ferromagnetic interface.

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