January 2013

Journal

Magneticandorbitalorderin(RMnO3)n/(AMnO3)2nsuperlatticesstudiedviaadouble-exchangemodelwithstrain

By:
Dong, Shuai ; Zhang, Qinfang; Yunoki, Seiji; Liu, J.-M.; Dagotto Mir, Elbio R
Journal Name:
Physical Review B
Page Number:
205121
Volume:
86
Issue Number:
20
Publication Date:
January 23, 2013
View DOI Listing:
https://doi.org/10.1103/PhysRevB.86.205121

Abstract

Thetwo-orbitaldouble-exchangemodelisemployedforthestudyofthemagneticandorbitalordersin(RMnO3)n/(AMnO3)2n(R:rareearths;A:alkaline-earthmetal)superlattices.TheA-typeantiferromagneticorderisobservedinabroadregionofparameterspaceforthecaseofSrTiO3assubstrate,inagreementwithrecentexperimentsandfirst-principlescalculationsusingthesesuperlattices.Inaddition,aC-typeantiferromagneticstateisalsopredictedtobestabilizedwhenusingsubstrateslikeLaAlO3withsmallerlatticeconstantsthanSrTiO3,againinagreementwithfirst-principlesresults.ThephysicalmechanismforthestabilizationoftheAandCmagnetictransitionsisdrivenbytheorbitalsplittingofthex2−y2and3z2−r2orbitals.ThissplittingisinducedbytheQ3modeofJahn-Tellerdistortionscreatedbythestraininducedbythesubstrates.Inadditiontothespecialexampleof(LaMnO3)n/(SrMnO3)2n,ourphasediagramscanbevaluableforthecasewherethesuperlatticesarepreparedemployingnarrowbandwidthmanganites.Inparticular,severalnonhomogenousmagneticprofilesarepredictedtooccurinnarrow-bandwidthsuperlattices,highlightingtheimportanceofcarryingoutinvestigationsinthismostlyunexploredareaofresearch.


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