Unexpected thermoelectric behavior and immiscibility of the allegedly complete solid solution<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Sr</mml:mi><mml:mo>(</mml:mo><mml:msub><mml:mi>Ru</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>–</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ti</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mo>)</mml:mo><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Jang, H. K.; Brendt, Jochen; Patro, L.N.; Martin, Manfred; Yoo, Han‐Ill

doi:10.1103/physrevb.89.144107

Cited by 8 publications

(11 citation statements)

References 28 publications

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“…Recently, Jang el al. [24] has reported a single-phase orthorhombic structure up to x = 0.1, then double-phase structure (orthorhombic and cubic) till x = 0.5 and after that a single-phase cubic structure for x > 0.5. A single-phase orthorhombic structure has also been shown for x up to 0.6.…”

Section: Structural Studymentioning

confidence: 99%

Site dilution in SrRuO₃: effects on structural and magnetic properties

Gupta

Pramanik

2017

J. Phys.: Condens. Matter

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We have investigated the effect of site dilution with substitution of nonmagnetic element in SrRu Ti O (x ⩽ 0.7). The nature of ferromagnetic state in SrRuO is believed to be of itinerant type with transition temperature [Formula: see text] K. Crystallographically, SrRuO has a distorted orthorhombic structure. Substitution of [Formula: see text] (3d ) for Ru (4d ), however, does not introduce significant structural modification due to their matching ionic radii. This substitution, on the other hand, is expected to tune the electronic correlation effect and the d electron density in the system. With Ti substitution, we find that magnetic moment and Curie temperature decreases but T remains unchanged which has been attributed to opposite tuning of electron correlation effect and density of states within the framework of itinerant ferromagnetism. The estimated critical exponent (β) related to magnetization implies a mean-field type of magnetic nature in SrRuO. The value of β further increases with x which is understood from the dilution effect of magnetic lattice. The system evolves to exhibit Griffiths phase like behavior above T which is usually realized in diluted ferromagnet following local moment model of magnetism. Our detail analysis of magnetization data indicates that magnetic state in SrRuO has contribution from both itinerant and local moment model of magnetism.

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Section: Structural Studymentioning

confidence: 99%

Site dilution in SrRuO₃: effects on structural and magnetic properties

Gupta

Pramanik

2017

J. Phys.: Condens. Matter

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“…Such elemental intermixing of A and B cations and the formation of oxygen vacancies in SRO undoubtedly have a strong effect on its electrical and magnetic properties. 30,31 For example, Ti doping and oxygen vacancies have been shown to increase the electrical resistance of SRO tenfold. 29,30 An increase in the resistance of the SRO electrode would increase the screening length in an FTJ, forming a passive layer, and resulting in a thicker critical thickness for the ferroelectric BTO layer.…”

Section: Resultsmentioning

confidence: 99%

“…30,31 For example, Ti doping and oxygen vacancies have been shown to increase the electrical resistance of SRO tenfold. 29,30 An increase in the resistance of the SRO electrode would increase the screening length in an FTJ, forming a passive layer, and resulting in a thicker critical thickness for the ferroelectric BTO layer. Figure 4(a) shows a schematic of the ideal SRO/BTO/SRO heterostructure and its equivalent circuit for metallic SRO electrodes with very low internal and contact resistances.…”

Section: Resultsmentioning

confidence: 99%

Elemental intermixing within an ultrathin SrRuO3 electrode layer in epitaxial heterostructure BaTiO3/SrRuO3/SrTiO3

Zhang

Ding

et al. 2016

AIP Advances

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Aberration corrected scanning transmission electron microscopy is used to directly observe atom columns in an epitaxial BaTiO3 thin film deposited on a 3.6 nm-thick SrRuO3 electrode layer above an SrTiO3 (001) substrate. Compositional gradients across the heterointerfaces were examined using electron energy-loss spectroscopy techniques. It was found that a small amount of Ba and Ti had diffused into the SrRuO3 layer, and that this layer contained a non-negligible concentration of oxygen vacancies. Such point defects are expected to degrade the electrode’s electronic conductivity drastically, resulting in a much longer screening length. This may explain the discrepancy between experimental measurements and theoretical estimates of the ferroelectric critical thickness of a BaTiO3 ferroelectric barrier sandwiched between metallic SrRuO3 electrodes, since theoretical calculations generally assume ideal (stoichiometric) perovskite SrRuO3.

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“…[2,3] Regarding Ru-site doping, two types of elements are of obvious choice; magnetic (Fe 4+ , Rh 4+ , Ir 4+ , Cr 4+ , etc) and nonmagnetic (Ti 4+ , Pb 4+ , Zn 2+ , Mg 2+ ). [19,20,21,22,23,24,25,26,27,28,29,30,31,32] While former type participates in existing magnetic interactions, the later causes a dilution in magnetic lattice. In the category of nonmagnetic doping, substitution of Ti 4+ has been well studied.…”

Section: Introductionmentioning

confidence: 99%

“…In the category of nonmagnetic doping, substitution of Ti 4+ has been well studied. [24,25,26,27,28,32] A recent study by us has shown that Ti 4+ substitution (till 70%) weakens the magnetic moment and the strength of its interaction, though the FM T c remains largely unaffected that has been explained with opposite changes of U and density of states N(ǫ F ) under the model of itinerant ferromagnetism. [7] In present study, we have used another nonmagnetic substitution Ga 3+ (3d 10 ) for Ru 4+ in SrRu 1−x Ga x O 3 (x ≤ 0.2).…”

Section: Introductionmentioning

confidence: 99%

Site dilution and charge disorder effect on physical properties in SrRu$_{1-x}$Ga$_x$O$_3$

Gupta,

Bhatti,

Pramanik

2019

Preprint

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Here, we report an evolution of structural, magnetic and transport behavior in doped SrRu 1−x Ga x O 3 (x ≤ 0.2). The nonmagnetic dopant Ga 3+ (3d 10 ) not only acts for magnetic site dilution in SrRuO 3 but also it modifies the Ru charge state and electronic density. Our studies show that Ga 3+ substitution does not affect the original orthorhombic-Pbnm structure of SrRuO 3 which is due to its matching ionic radii with Ru 4+ . However, Ga 3+ has a substantial effect on the magnetic behavior of SrRuO 3 where it decreases both magnetic moment as well as magnetic transition temperature T c . Further, this dilution induces Griffiths phase behavior across T c and cluster-glass behavior at low temperature with higher concentration of doping. The magnetic critical exponent β increases with x due to this site dilution effect. The Ga 3+ induces an insulating state in SrRuO 3 with x > 0.05. The charge transport in paramagnetic as well as in insulating state of samples can be well described with Mott's modified variable-range-hopping model. The metallic charge transport just below T c in SrRuO 3 obeys Fermi liquid behavior which, however breaks down at low temperature. We further find a correlation between field dependent magnetoresistance and magnetization through power-law behavior over the series.

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Unexpected thermoelectric behavior and immiscibility of the allegedly complete solid solutionSr(Ru1–xTix)O3

Cited by 8 publications

References 28 publications

Site dilution in SrRuO₃: effects on structural and magnetic properties

Site dilution in SrRuO₃: effects on structural and magnetic properties

Elemental intermixing within an ultrathin SrRuO3 electrode layer in epitaxial heterostructure BaTiO3/SrRuO3/SrTiO3

Site dilution and charge disorder effect on physical properties in SrRu$_{1-x}$Ga$_x$O$_3$

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Unexpected thermoelectric behavior and immiscibility of the allegedly complete solid solutionSr(Ru1–xTix)O3

Cited by 8 publications

References 28 publications

Site dilution in SrRuO3: effects on structural and magnetic properties

Site dilution in SrRuO3: effects on structural and magnetic properties

Elemental intermixing within an ultrathin SrRuO3 electrode layer in epitaxial heterostructure BaTiO3/SrRuO3/SrTiO3

Site dilution and charge disorder effect on physical properties in SrRu$_{1-x}$Ga$_x$O$_3$

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Product

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Site dilution in SrRuO₃: effects on structural and magnetic properties

Site dilution in SrRuO₃: effects on structural and magnetic properties