Strain response of magnetic order in perovskite-type oxide films

Herklotz, Andreas; Biegalski, Michael D.; Christen, H. M.; Guo, Er‐Jia; Nenkov, K.; Rata, A. D.; Schultz, L.; Dörr, K.

doi:10.1098/rsta.2012.0441

Cited by 10 publications

(7 citation statements)

References 31 publications

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“…Films show a different pattern of rotation and tilt than do bulk materials, and in films the rotation angles may be manipulated by strain. Calculations of the strain dependence of the mass enhancement and magnetic moment in thin films of SrRuO CaRuO 3 will be very interesting to perform and compare to experiment [46,97] and to previous LSDA results [44,45]. Studying theoretically the ruthenates within a wide energy window to include oxygen p and e g bands, which are both close to the frontier t 2g bands, is an interesting subject, too.…”

Section: Discussionmentioning

confidence: 91%

Electronic correlations, magnetism, and Hund's rule coupling in the ruthenium perovskitesSrRuO3andCaRuO3

Dang¹,

Mravlje²,

Georges³

et al. 2015

Phys. Rev. B

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A comparative density functional plus dynamical mean field theory study of the pseudocubic ruthenate materials CaRuO3 and SrRuO3 is presented. Phase diagrams are determined for both materials as a function of Hubbard repulsion U and Hund's rule coupling J. Metallic and insulating phases are found, as are ferromagnetic and paramagnetic states. The locations of the relevant phase boundaries are determined. Based on the computed phase diagrams, Mott-dominated and Hund's dominated regimes of strong correlation are distinguished. Comparison of calculated properties to experiments indicates that the actual materials are in the Hund's coupling dominated region of the phase diagram so can be characterized as Hund's metals, in common with other members of the ruthenate family. Comparison of the phase diagrams for the two materials reveals the role played by rotational and tilt (GdFeO3-type) distortions of the ideal perovskite structure. The presence of magnetism in SrRuO3 and its absence in CaRuO3 despite the larger mass and larger tilt/rotational distortion amplitude of CaRuO3 can be understood in terms of density of states effects in the presence of strong Hund's coupling. Comparison of the calculated low-T properties of CaRuO3 to those of SrRuO3 provides insight into the effects of magnetic order on the properties of a Hund's metal. The study provides a simultaneous description of magnetism and correlations and explicates the roles played by band theory and Hubbard and Hund's interactions.

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Section: Discussionmentioning

confidence: 91%

Electronic correlations, magnetism, and Hund's rule coupling in the ruthenium perovskitesSrRuO3andCaRuO3

Dang¹,

Mravlje²,

Georges³

et al. 2015

Phys. Rev. B

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“…[ 11 ] In general, the properties of transition metal oxides depend strongly on point defects such as oxygen vacancies, [ 12,13 ] which in turn are related to the preparation method. Moreover, electronic and magnetic ordering on the nanoscale are affected by lattice distortions [ 14,15 ] mediated by cooperative tilting and rotation of the MnO 6 octahedra, which yields a change of charge carrier mobility [ 16 ] and electrical resistance [ 17 ] as well as the charge ordering temperature. [ 18 ]…”

Section: Introductionmentioning

confidence: 99%

Tailoring c‐Axis Orientation in Epitaxial Ruddlesden–Popper Pr_0.5Ca_1.5MnO₄ Films

Hoffmann-Urlaub

Roß

Hoffmann

et al. 2021

Adv Materials Inter

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Interest in layered Ruddlesden–Popper (RP) strongly correlated manganites of Pr0.5Ca1.5MnO4 as well as in their thin film polymorphs is motivated by the high temperature of charge orbital ordering above room temperature. The c‐axis orientation in epitaxial films is tailored by different SrTiO3 (STO) substrate orientations and CaMnO3 (CMO) buffer layers. Films on STO(110) show in‐plane alignment of the c‐axis parallel to the [100] direction. On STO(100), two possible directions of the in‐plane c‐axis lead to a mosaic like, quasi 2D nanostructure, consisting of RP, rock‐salt, and perovskite blocks. With the CMO buffer layer, Pr0.5Ca1.5MnO4 epitaxial films with c‐axis out‐of‐plane are realized. Different physical vapor deposition techniques as ion beam sputtering, pulsed laser deposition and metalorganic aerosol deposition are applied in order to distinguish effects of growth conditions from intrinsic epitaxial properties. Despite their very different growth conditions, surface morphology, crystal structure, and orientation of the thin films reveal a high level of similarity as verified by X‐ray diffraction, scanning, and high resolution transmission electron microscopy. For different epitaxial relations stress in the films is relaxed by means of modified interface chemistry. The charge ordering in the films occurs at a temperature close to that expected in bulk material.

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“…[ 23–30 ] The magnetic ordering temperature (Curie temperature or Néel temperature) in magnetic materials is highly size‐, strain‐, and surface‐sensitive. [ 25,29,31–36 ] Many magnetic nanostructures exhibit unusual low‐temperature magnetic properties. [ 37,38 ] Nanoporous ferrite materials have also been reported to show altered magnetic ordering.…”

Section: Introductionmentioning

confidence: 99%

Crystalline Mesoporous Complex Oxides: Porosity‐Controlled Electromagnetic Response

Liu

Shi

et al. 2020

Adv Funct Materials

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A colloidal-amphiphile-templated growth is developed to synthesize mesoporous complex oxides with highly crystalline frameworks. Organosilane-containing colloidal templates can convert into thermally stable silica that prevents the overgrowth of crystalline grains and the collapse of the mesoporosity. Using ilmenite CoTiO 3 as an example, the high crystallinity and the extraordinary thermal stability of its mesoporosity are demonstrated at 800 °C for 48 h under air. This synthetic approach is general and applicable to a series of complex oxides that are not reported with mesoporosity and high crystallinity, such as NiTiO . Those novel materials make it possible to build up correlations between mesoscale porosity and surfacesensitive physicochemical properties, e.g., electromagnetic response. For mesoporous CoTiO 3 , there is a 3 K increase of its antiferromagnetic ordering temperature, compared with that of nonporous one. This finding provides a general guideline to design mesoporous complex oxides that allow exploring their unique properties different from bulk materials.complex oxides, in general, has associated kinetic barriers from the slow diffusion in solids. [15] When there are two metal cations involved in crystallization of complex oxides like ABO 3 , their nonuniform distribution can result in spontaneous phase separation to form simple oxides. [16] A delicate balance of their sol-gel rates and the precautious control of thermal annealing procedure is needed. On the other hand, ordering competition between the crystallization of oxides and the mesoscale porosity brings profound difficulties to synthesize complex oxides (e.g., perovskites and ilmenites) with mesoporous structures. Crystallization usually leads to the formation of large crystalline grains that will create strong interfacial energies between crystalline walls and pores (e.g., air or templates). For any templated growth of mesoporous oxides using hydrocarbon-based surfactants or block copolymers (BCPs) as soft templates, [17][18][19] mesoscale nanostructures collapse prior to the crystallization of oxides, [20][21][22] because these soft templates are not mechanically strong and thermally stable under elevated temperatures (i.e., >500 °C).Nanostructures show a profound impact on the magnetic properties of materials as well and a few theoretical models have been proposed to understand magnetic behavior of nanoscale particles. [23][24][25][26][27][28][29][30] The magnetic ordering temperature (Curie temperature or Néel temperature) in magnetic materials

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Strain response of magnetic order in perovskite-type oxide films

Cited by 10 publications

References 31 publications

Electronic correlations, magnetism, and Hund's rule coupling in the ruthenium perovskitesSrRuO3andCaRuO3

Electronic correlations, magnetism, and Hund's rule coupling in the ruthenium perovskitesSrRuO3andCaRuO3

Tailoring c‐Axis Orientation in Epitaxial Ruddlesden–Popper Pr_0.5Ca_1.5MnO₄ Films

Crystalline Mesoporous Complex Oxides: Porosity‐Controlled Electromagnetic Response

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Strain response of magnetic order in perovskite-type oxide films

Cited by 10 publications

References 31 publications

Electronic correlations, magnetism, and Hund's rule coupling in the ruthenium perovskitesSrRuO3andCaRuO3

Electronic correlations, magnetism, and Hund's rule coupling in the ruthenium perovskitesSrRuO3andCaRuO3

Tailoring c‐Axis Orientation in Epitaxial Ruddlesden–Popper Pr0.5Ca1.5MnO4 Films

Crystalline Mesoporous Complex Oxides: Porosity‐Controlled Electromagnetic Response

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Tailoring c‐Axis Orientation in Epitaxial Ruddlesden–Popper Pr_0.5Ca_1.5MnO₄ Films