Hall effect of tetragonal and orthorhombic SrRuO<sub>3</sub> films

Bern, Francis; Ziese, M.; Dörr, K.; Herklotz, Andreas; Vrejoiu, Ionela

doi:10.1002/pssr.201206500

Cited by 16 publications

(26 citation statements)

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“…This structural transition further leads to a sign change of the anomalous Hall constant from a negative value at low temperatures in orthorhombic to a positive value in tetragonal SRO layers, clearly showing that the structural transition affects the electronic structure [33]. The Hall effect sign change was also found in orthorhombic and tetragonal single SRO films [40]. The situation in LSMO/SRO superlattices is less clear.…”

Section: Magnetic Anisotropy (110)-oriented Srruomentioning

confidence: 93%

Properties of manganite/ruthenate superlattices with ultrathin layers

Ziese

Vrejoiu

2013

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The properties of manganite/ruthenate superlattices are reviewed with a specific focus on the manganite/ruthenate interface. La0.7Sr0.3MnO3/SrRuO3 and Pr0.7Ca0.3MnO3/SrRuO3 superlattices grow with a high crystalline perfection as illustrated in the figure to the right: at the interface the individual cation species can be clearly identified, interdiffusion is marginal. The superlattices show magnetization processes with an intricate interplay between magnetocrystalline anisotropy, size of the layer magnetization, spin confinement and interfacial antiferromagnetic interlayer coupling. There is further an unprecedented Curie temperature stabilization at room temperature values of the La0.7Sr0.3MnO3 layers in the superlattices down to layer thicknesses of one unit cell. The magnetotransport properties, especially the Hall effect, indicate the existence of a quasi‐two‐dimensional hole gas at the La0.7Sr0.3MnO3/SrRuO3 interface; this is further supported by an analysis of cation displacements as determined from scanning transmission electron microscopy. The manganite/ruthenate interface might be considered as a model system for the study of interfacial reconstruction and charge transfer in a highly correlated ferromagnetic system.magnified imageHAADF‐STEM micrograph of two La0.7Sr0.3MnO3/SrRuO3 interfaces in a superlattice with four unit cell thick La0.7Sr0.3MnO3 and eight unit cell thick SrRuO3 layers. The spheres indicate the cations as determined from the Z‐contrast.(© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Magnetic Anisotropy (110)-oriented Srruomentioning

confidence: 93%

Properties of manganite/ruthenate superlattices with ultrathin layers

Ziese

Vrejoiu

2013

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“…It is known that SRO is an electron, LBMO a hole conductor; further the anomalous Hall constant R A of LBMO is negative [30], whereas that of orthorhombic SRO has a more complicated temperature dependence, being negative at low and positive at higher temperatures [29,31,32]. In contrast, the anomalous Hall coefficient of tetragonal SRO is positive in the whole temperature range [29]. With this in mind, one might interpret the Hall resistivity curves shown in figure 4 as follows.…”

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confidence: 96%

“…This contribution can only be seen, when the conductance of LBMO film and embedding SRO layers is of the same magnitude; this shows that the LBMO films are both ferromagnetic and conducting. At 150 K, the high field Hall effect is dominated by both the Hall effect of LBMO and the Hall effect of SRO in the paramagnetic phase that is weakly nonlinear in magnetic field [29]. At the higher temperatures of 200 K and 250 K the anomalous Hall effect contribution of the embedded films remains, but becomes nonlinear for the 1 and 2 unit cell thick films as they enter the paramagnetic phase at 169 K and 217 K, respectively.…”

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confidence: 98%

“…The Hall resistivity at low temperatures has a complex magnetic field dependence that reflects the interplay between antiferromagnetic coupling between LBMO and SRO layers, the Zeeman energy and the magnetocrystalline anisotropy. It is known that SRO is an electron, LBMO a hole conductor; further the anomalous Hall constant R A of LBMO is negative [30], whereas that of orthorhombic SRO has a more complicated temperature dependence, being negative at low and positive at higher temperatures [29,31,32]. In contrast, the anomalous Hall coefficient of tetragonal SRO is positive in the whole temperature range [29].…”

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confidence: 99%

“…The separation of the two anomalous Hall constants is not satisfactory in case of the 3 uc thick film due to a magnetization rotation process at low fields, see below. The temperature dependence of the anomalous Hall constant attributed to SRO is reminiscent of ultrathin orthorhombic SRO films [29,31,32], while the LBMO films contribute a negative, weakly temperature dependent term. Astonishingly, the anomalous Hall effect of the present embedded LBMO films is much easier to understand as a superposition of the contributions from the constituent layers than is the case in LSMO/SRO superlattices [17,33].…”

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confidence: 99%

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Magnetic and magnetotransport properties of ultrathin La${}_{0.7}$Ba${}_{0.3}$MnO₃epitaxial films embedded in SrRuO₃

et al. 2016

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The structural, magnetic and magnetotransport properties of La 0.7 Ba 0.3 MnO 3 layers interfaced with SrRuO 3 layers were studied. High quality trilayers with coherent interfaces were fabricated by pulsed laser deposition. The thickness of the embedded La 0.7 Ba 0.3 MnO 3 layer was varied between one and five unit cells, whereas the embedding SrRuO 3 layers were kept at a constant thickness of three unit cells. In this embedded geometry La 0.7 Ba 0.3 MnO 3 layers are ferromagnetic, even if only one unit cell thick. Magnetization and anomalous Hall effect curves show an antiferromagnetic coupling of the layers that leads to an intricate magnetic field dependence. When this is disentangled, it can be shown that the magnetic and transport properties are mainly dominated by the corresponding properties of the constituent materials.Extensive research effort was devoted to the study of thin ferromagnetic films grown on various substrates [1][2][3]. Although restricted to ferromagnetic films, this research field is very wide ranging from elemental metallic films and their spin structures [4] or their multiferroic properties [5] to oxide films and their complex interplay between spin, structure, orbital and electronic properties [6]. There is one underlying feature in these systems; thin films-unless these are free-standing-have an underlying asymmetry being adjacent to the substrate on one side and to vacuum (or often more realistically: to an unknown variety of adsorbates) on the other side. Depending on the properties of the substrate, this proximity might induce obvious changes of the film properties, e.g. exchange biasing of a ferromagnetic film in contact with an antiferromagnetic substrate [7]. The issue of magnetic proximity, however, might be far more subtle, extending to less obvious changes [8]. The situation might be similar to proximity effects in superconductors [9], albeit with the difference that the relevant interaction length scales are sensitive to coupling type and interface characteristics [10]. Apart from subtle proximity effects one has to consider the effect of strain and, for perovskite-like oxides, the effect of the oxygen octahedral tilt and rotation mismatch at interfaces between dissimilar materials.In this work we study the magnetic and magnetotransport properties of embedded La 0.7 Ba 0.3 MnO 3 (LBMO) films with thicknesses ranging from one to five unit cells (uc). In recent years a series of studies on exposed thin manganite films [11][12][13][14] showed that these films lost their ferromagnetism and metallicity below a critical thickness of about eight unit cells [14]. This was attributed to the strain exerted by the substrate (either SrTiO 3 or LaAlO 3 ) and the surface symmetry breaking: a tetragonal distortion of the unit cell would lead to an energetic splitting of the d z 2 andd x y 2 2orbitals, destabilizing the double exchange interaction, while stabilizing the superexchange interaction and thus tipping the balance between ferro-and antiferromagnetism [12,15,16]. We have shown bef...

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Reversal of Anomalous Hall Effect and Octahedral Tilting in SrRuO₃ Thin Films via Hydrogen Spillover

et al. 2022

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The perovskite SrRuO3 (SRO) is a strongly correlated oxide whose physical and structural properties are strongly intertwined. Notably, SRO is an itinerant ferromagnet that exhibits a large anomalous Hall effect (AHE) whose sign can be readily modified. Here, a hydrogen spillover method is used to tailor the properties of SRO thin films via hydrogen incorporation. It is found that the magnetization and Curie temperature of the films are strongly reduced and, at the same time, the structure evolves from an orthorhombic to a tetragonal phase as the hydrogen content is increased up to ≈0.9 H per SRO formula unit. The structural phase transition is shown, via in situ crystal truncation rod measurements, to be related to tilting of the RuO6 octahedral units. The significant changes observed in magnetization are shown, via density functional theory (DFT), to be a consequence of shifts in the Fermi level. The reported findings provide new insights into the physical properties of SRO via tailoring its lattice symmetry and emergent physical phenomena via the hydrogen spillover technique.

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Hall effect of tetragonal and orthorhombic SrRuO₃ films

Cited by 16 publications

References 16 publications

Properties of manganite/ruthenate superlattices with ultrathin layers

Properties of manganite/ruthenate superlattices with ultrathin layers

Magnetic and magnetotransport properties of ultrathin La${}_{0.7}$Ba${}_{0.3}$MnO₃epitaxial films embedded in SrRuO₃

Reversal of Anomalous Hall Effect and Octahedral Tilting in SrRuO₃ Thin Films via Hydrogen Spillover

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Hall effect of tetragonal and orthorhombic SrRuO3 films

Cited by 16 publications

References 16 publications

Properties of manganite/ruthenate superlattices with ultrathin layers

Properties of manganite/ruthenate superlattices with ultrathin layers

Magnetic and magnetotransport properties of ultrathin La${}_{0.7}$Ba${}_{0.3}$MnO3epitaxial films embedded in SrRuO3

Reversal of Anomalous Hall Effect and Octahedral Tilting in SrRuO3 Thin Films via Hydrogen Spillover

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Product

Resources

About

Hall effect of tetragonal and orthorhombic SrRuO₃ films

Magnetic and magnetotransport properties of ultrathin La${}_{0.7}$Ba${}_{0.3}$MnO₃epitaxial films embedded in SrRuO₃

Reversal of Anomalous Hall Effect and Octahedral Tilting in SrRuO₃ Thin Films via Hydrogen Spillover