English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Spin-orbital model of stoichiometric LaMnO3 with tetragonal distortions

Snamina, M., & Oleś, A. (2018). Spin-orbital model of stoichiometric LaMnO3 with tetragonal distortions. Physical Review B, 97(10): 104417.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Snamina, M., Author
Oleś, A.1, Author
Affiliations:
1Max Planck Society, ou_persistent13              

Content

show
hide
Free keywords: -
 Abstract: The spin-orbital superexchange model is derived for the cubic (perovskite) symmetry of LaMnO3, whereas real crystal structure is strongly deformed. We identify and explain three a priori important physical effects arising from tetragonal deformation: (i) the splitting of e(g) orbitals alpha E-z, (ii) the directional renormalization of d-p hybridization t(pd), and (iii) the directional renormalization of charge excitation energies. Using the example of LaMnO3 crystal we evaluate their magnitude. It is found that the major effects of deformation are an enhanced amplitude of x(2)-y(2) orbitals induced in the orbital order by E-z similar or equal to 300 meV and anisotropic t(pd) similar or equal to 2.0 (2.35) eV along the ab (c) cubic axis, in very good agreement with Harrison's law. We show that the improved tetragonal model analyzed within mean field approximation provides a surprisingly consistent picture of the ground state. Excellent agreement with the experimental data is obtained simultaneously for: (i) e(g) orbital mixing angle, (ii) spin exchange constants, and (iii) the temperatures of spin and orbital phase transition.

Details

show
hide
Language(s): eng - English
 Dates: 2018
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 744549
ISI: 000428156800003
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Physical Review B
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: COLLEGE PK : AMER PHYSICAL SOC
Pages: - Volume / Issue: 97 (10) Sequence Number: 104417 Start / End Page: - Identifier: ISSN: 2469-9950