Structure and transport properties of coherently strained La2/3Ca1/3MnO3/SrTiO3 superlattices

Lu, Yijia; Klein, Jacques-Olivier; Herbstritt, F.; Philipp, J. B.; Marx, Achim; Alff, Lambert; Gross, Rudolf; Zhang, Haiyan

doi:10.1002/pssb.200540048

Cited by 8 publications

(9 citation statements)

References 56 publications

(49 reference statements)

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“…1͒. The structural analysis shows that the superlattices have excellent epitaxial quality 27,29,42 and are coherently strained, allowing for the continuous variation of the biaxial strain.…”

Section: Resultsmentioning

confidence: 96%

“…The fabrication and structural characterization of the superlattices have been reported in detail recently 27,29,42 and are therefore discussed only briefly here. We have used HAXRD, LAXRR, and rocking curve measurements for structural characterization of the superlattices.…”

Section: Resultsmentioning

confidence: 99%

“…From the LAXRR measurements a small interface roughness of only a few angstrom was derived. 27,29 Rocking curve measurements yield a small mosaic spread of 0.02°to 0.04°limited by the substrate quality. 27,29 Off-specular XRR measurements indicate that the interface roughness detected by specular XRR is to a large extent correlated in the growth direction.…”

Section: Resultsmentioning

confidence: 99%

“…27,29 Rocking curve measurements yield a small mosaic spread of 0.02°to 0.04°limited by the substrate quality. 27,29 Off-specular XRR measurements indicate that the interface roughness detected by specular XRR is to a large extent correlated in the growth direction. 29 This point is confirmed by the observation of a significant diffuse background in the rocking curves due to vertically correlated roughness ͑see the inset of Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the clarification of the detailed role of biaxial strain is essential and has been recently addressed in several experimental studies based on ultrathin films and artificial heterostructures. [27][28][29][30] Beyond the influence of strain on the magnetotransport properties of the doped manganites, strain also has been found to significantly affect the noise properties. It was found that the lowfrequency 1 / f noise in strained films is drastically enhanced compared to the noise in almost strain-free films.…”

Section: Introductionmentioning

confidence: 99%

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Effect of strain and tetragonal lattice distortions in doped perovskite manganites

Klein

Herbstritt

et al. 2006

Phys. Rev. B

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A series of high-quality, coherently strained ͓La 2/3 ͑Ca or Ba͒ 1/3 MnO 3 / SrTiO 3 ͔ ϫ N superlattices has been prepared on ͑100͒ SrTiO 3 and NdGaO 3 substrates by laser molecular beam epitaxy. The manganite layers are biaxially strained due to lattice mismatch. A quadratic decrease of the metal-to-insulator transition temperature T p with increasing biaxial distortion bi 2 both for tensile and compressive in-plane strain is found. For T Ͼ T p , the resistivity versus temperature curves could be well described by the small polaron hopping model with the polaron binding energy increasing with increasing bi 2 . Furthermore, the magnetoresistance of the manganite films was found to strongly increase with increasing bi 2 or decreasing T p , respectively, following a universalbehavior. An anomalous upturn of resistivity in the low-temperature regime ͑T Ͻ 25 K͒ was detected, which may be attributed to enhanced Coulomb interaction of the charge carriers resulting from disorder due to the lattice distortion. Our analysis clearly demonstrates the importance of biaxial strain and Jahn-Teller-type lattice distortions for the physics of the doped manganites. It is shown that epitaxial coherency strain can be used to deliberately modify the materials properties.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of strain and tetragonal lattice distortions in doped perovskite manganites

Klein

Herbstritt

et al. 2006

Phys. Rev. B

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Novel multifunctional materials based on oxide thin films and artificial heteroepitaxial multilayers

Opel

Geprägs

Menzel

et al. 2010

Physica Status Solidi (a)

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Transition metal oxides show fascinating physical properties such as high temperature superconductivity, ferro‐ and antiferromagnetism, ferroelectricity or even multiferroicity. The enormous progress in oxide thin film technology allows us to integrate these materials with semiconducting, normal conducting, dielectric, or non‐linear optical oxides in complex oxide heterostructures, providing the basis for novel multi‐functional materials and various device applications. Here, we report on the combination of ferromagnetic, semiconducting, metallic, and dielectric materials properties in thin films and artificial heterostructures using laser molecular beam epitaxy. We discuss the fabrication and characterization of oxide‐based ferromagnetic tunnel junctions, transition metal‐doped semiconductors, intrinsic multiferroics, and artificial ferroelectric/ferromagnetic heterostructures – the latter allow for the detailed study of strain effects, forming the basis of spin‐mechanics. For characterization we use X‐ray diffraction, SQUID magnetometry, magnetotransport measurements, and advanced methods of transmission electron microscopy (TEM) with the goal to correlate macroscopic physical properties with the microstructure of the thin films and heterostructures. The combination of magnetic properties with dielectric, semiconducting, or ferroelectric materials in one and the same material (e.g. magnetic semiconductors (MS) or intrinsic multiferroics) as well as in artificial heterostructures (e.g. ferromagnetic/dielectric heterostructures for magnetic tunnel junctions (MTJs) or artificial multiferroic heterostructures) allows for the design of materials with novel functionalities and provides the basis for various device applications.

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Structure and transport properties of coherently strained La_2/3Ca_1/3MnO₃/SrTiO₃ superlattices

Klein

Herbstritt

et al. 2005

Physica Status Solidi (b)

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The front cover of this issue, taken from the Editor's Choice, displays the structural characterization of coherently strained La2/3Ca1/3MnO3/SrTiO3 superlattices prepared by laser molecular beam epitaxy [1]. The pronounced superlattice Bragg peaks and the Kiessig fringes indicate an excellent superlattice structure. The superlattice modulation period is obtained by fitting sin2 θ ∼ n2 and also specular low‐angle X‐ray reflectivity. The correlated interface roughness is confirmed by offset low‐angle X‐ray reflectivity and low‐angle rocking curve. First author Yafeng Lu was a PhD student in the group led by Prof. R. Gross. His research interests are magnetic materials, superconducting materials, and surface physics.

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Structure and transport properties of coherently strained La_2/3Ca_1/3MnO₃/SrTiO₃ superlattices

Cited by 8 publications

References 56 publications

Effect of strain and tetragonal lattice distortions in doped perovskite manganites

Effect of strain and tetragonal lattice distortions in doped perovskite manganites

Novel multifunctional materials based on oxide thin films and artificial heteroepitaxial multilayers

Structure and transport properties of coherently strained La_2/3Ca_1/3MnO₃/SrTiO₃ superlattices

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