Open AccessJournal Article10.1103/PHYSREVB.82.113101

Interface controlled electronic variations in correlated heterostructures

- 07 Sep 2010

- Vol. 82, Iss: 11, pp 113101

TL;DR: In this paper, an interface modification of LCMO-BTO superlattices was found to massively influence magnetic and magnetotransport properties and determined the crystal structure of the manganite layers, changing it from orthorhombic (Pnma) to rhombohedral (R-3c) for the modified one.

Abstract: An interface modification of LCMO-BTO superlattices was found to massively influence magnetic and magnetotransport properties. Moreover it determines the crystal structure of the manganite layers, changing it from orthorhombic (Pnma) for the conventional superlattice (cSL), to rhombohedral (R-3c) for the modified one (mSL). While the cSL shows extremely nonlinear ac transport, the mSL is an electrically homogeneous material. The observations go beyond an oversimplified picture of dead interface layers and evidence the importance of electronic correlations at perovskite interfaces.

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Localization is stabilized by the JahnTeller JT effect, that lifts the eg-orbital degeneracy of Mn3+ ions,9 giving rise to JT polarons, that are discussed to be the main type of charge carrier at all temperatures.. As the authors have shown recently, CP can be probed by means of the third harmonic voltage, which is a measure of electric nonlinearity, because of their quadrupole nature.. Here the authors use ac transport, superconducting quantum interference device magnetometry and transmission electron microscopy TEM to study the influence of interfaces in superlattices SLs and the effect of an interface modification by additional LMO layers.. The modified SL mSL consists of the same LCMO and BTO layers, but additionally two u. c. of LMO were introduced at each interface: LCMO40 /LMO2 /BTO20 /LMO2 10.. The nominal thickness of the additional LMO layers has been controlled by the volume of metal-organic solution introduced to the deposition system.. 20 Furthermore CP can be attributed to the CE-AFM phase, which shows the same superstructure wave vector q = 1 4, 1 4 ,0.

FIG. 4. Color online a Normalized magnetization as a function of temperature of the cSL blue squares and mSL red circles . b Magnetic hysteresis at T=10 K of cSL blue squares and mSL red circles after FC at 0H=5 T and cSL solid line and mSL dotted line after ZFC.

FIG. 5. Color online Transport properties of the cSL blue squares and mSL red circles as a function of temperature. a Linear ac resistance R and b the nonlinear coefficient K3 are shown for FC closed symbols and ZFC open symbols measurements.

FIG. 3. Color Energy-filtered transmission electron micrographs of the modified superlattice blue=Ti, red=Mn, and green=La . Film plus substrate top and topmost layers of the film bottom .

FIG. 1. Color online X-ray diffraction patterns of the conventional open squares and modified open circles superlattice at the position of the perovskite 001 Bragg peak. Overall intensity is modulated by the BTO 001 and LCMO 001 crystalline reflexes.

FIG. 2. Color Microstructure analysis of the cSL left and mSL right . Electron-diffraction patterns top reveal a Pnma symmetry for cSL and b R3̄c symmetry for mSL. Cross-section HRTEM mid confirm epitaxial growth and coherent interfaces of c cSL and d mSL. GPA bottom shows strain fields along the growth direction to be e inhomogeneous for cSL and f homogeneous for mSL.

Citations

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Temperature dependence of magnetoelectric effect in Bi3.15Nd0.85Ti3O12–La0.7Ca0.3MnO3 multiferroic composite films buffered by a LaNiO3 layer

Zhenhua Tang, +7 more

- 30 Jan 2014

- Journal of Materials Chemistry C

TL;DR: In this paper, a multiferroic composite thin films were fabricated based on ferroelectric (FE) Bi3.15Nd0.85Ti3O12 (BNT) and ferromagnetic (FM) La0.7Ca0.3MnO3 (LCMO) parents with different growth sequences of BNT-LCMO/LNO/STO (BL) and LCMO-BNT/L NO/STo (LB).

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Stuart Turner, +5 more

- 22 Jan 2013

- Physical Review B

TL;DR: In this article, an atomically flat interface reconstruction consisting of a single Ca-rich atomic layer is observed on the compressively strained BTO on LCMO interface, which is thought to partially neutralize the total charge from the alternating polar atomic layers in LCMO as well as relieving strain at the interface.

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J. Laverdière, +2 more

- 19 Sep 2011

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TL;DR: In this paper, the interfacial interaction between a ferromagnetic metallic manganite in proximity to a charge-ordered manganites in a bilayer structure was studied, and it was shown that the metal-insulator transition temperature decreases with the NSMO-1/3 thickness down to a critical value of 4-5 nm below which the metal remains insulating at low temperature.

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The enhanced magnetoelectric effect and piezoelectric properties in the lead-free Bi3.15Nd0.85Ti3O12/La0.7Ca0.3MnO3 nano-multilayers composite thin films

Zhenhua Tang, +8 more

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- Journal of Alloys and Compounds

TL;DR: In this article, a lead-free multiferroic nano-multilayers composite thin films were fabricated on basis of ferroelectric (FE) Bi3.15Nd0.85Ti3O12 (BNT) and ferromagnetic (FM) La0.7Ca0.3MnO3 (LCMO) parents with 8 nm/6 nm periodicity.

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Laser-induced changes of nonlinear electronic transport properties in La0.75Ba0.25MnO3 and (La0.6Pr0.4)0.67Ca0.33MnO3.

M Mchalwat, +9 more

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TL;DR: Both materials show an enhancement of the third harmonic voltage in the vicinity of the metal-to-insulator transition, indicating strong electron-lattice correlations within a phase-separated state.

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References

Journal Article•10.1038/NATURE02308

A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface

A. Ohtomo, +2 more

- 29 Jan 2004

- Nature

TL;DR: A model interface is examined between two insulating perovskite oxides—LaAlO3 and SrTiO3—in which the termination layer at the interface is controlled on an atomic scale, presenting a broad opportunity to tailor low-dimensional charge states by atomically engineered oxide heteroepitaxy.

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Journal Article•10.1103/PHYSREVLETT.75.3336

Low temperature magnetoresistance and the magnetic phase diagram of La1-xCaxMnO3.

Peter Schiffer, +3 more

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- Physical Review Letters

TL;DR: An unexpectedly large magnetoresistance is seen at low temperatures in the FM phase, and is largely attributed to unusual domain wall scattering.

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2.2K

•Journal Article•10.1038/NMAT1569

Why some interfaces cannot be sharp

Naoyuki Nakagawa, +2 more

- 01 Mar 2006

- Nature Materials

TL;DR: In this article, the authors examined the microscopic distribution of charge and ions across the (001) LaAlO3/SrTiO3 interface, and they found that there is a fundamental asymmetry between the ionically compensated AlO2/srO/TiO2 interface, both in interfacial sharpness and charge density.

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1.6K

Journal Article•10.1103/PHYSREVLETT.44.1597

New class of layered materials

Ivan K. Schuller

- 16 Jun 1980

- Physical Review Letters

TL;DR: In this paper, a new class of layered materials has been prepared by alternate deposition of two dissimilar metals, and strong experimental evidence is shown that coherent structures with layer thicknesses approaching interatomic spacing can be prepared in this fashion.

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•Journal Article•10.1103/PHYSREVB.78.094413

Critical thickness and orbital ordering in ultrathin La0.7Sr0.3MnO3 films

M. Huijben, +9 more

- 16 Sep 2008

- Physical Review B

TL;DR: In this paper, a lower critical thickness for a nonmetallic nonferromagnetic layer at the interface with the SrTiO3 (001) substrate of only three unit cells was identified.

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Interface controlled electronic variations in correlated heterostructures

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Citations

Temperature dependence of magnetoelectric effect in Bi3.15Nd0.85Ti3O12–La0.7Ca0.3MnO3 multiferroic composite films buffered by a LaNiO3 layer

Structural phase transition and spontaneous interface reconstruction in La 2/3 Ca 1/3 MnO 3 /BaTiO 3 superlattices

Colossal magnetoresistance of Nd 2/3 Sr 1/3 MnO 3 ultrathin films grown on charge-ordered Nd 1/2 Ca 1/2 MnO 3 manganite

The enhanced magnetoelectric effect and piezoelectric properties in the lead-free Bi3.15Nd0.85Ti3O12/La0.7Ca0.3MnO3 nano-multilayers composite thin films

Laser-induced changes of nonlinear electronic transport properties in La0.75Ba0.25MnO3 and (La0.6Pr0.4)0.67Ca0.33MnO3.

References

A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface

Low temperature magnetoresistance and the magnetic phase diagram of La1-xCaxMnO3.

Why some interfaces cannot be sharp

New class of layered materials

Critical thickness and orbital ordering in ultrathin La0.7Sr0.3MnO3 films

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