Magnetization and Critical Fields of Superconducting SrTi<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Ambler, E.; Colwell, J. H.; Hosler, W. R.; Schooley, James F.

doi:10.1103/physrev.148.280

Cited by 64 publications

(18 citation statements)

References 16 publications

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“…Comparing the mass m D obtained from the experimental specific heat [30,51] with the mass m b obtained using optical spectral weights [17] reveals the mass ratio of the heavy and light bands to be about 27. The expression (18) replaces the bare mass m b in the optical conductivity (9) and in the memory function (14).…”

Section: Optical Conductivity Of a Gas Of Large Polaronsmentioning

confidence: 94%

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Many-body large polaron optical conductivity inSrTi1−xNbxO3

et al. 2010

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Recent experimental data on the optical conductivity of niobium doped SrTiO3 are interpreted in terms of a gas of large polarons with effective coupling constant α ef f ≈ 2. The theoretical approach takes into account many-body effects, the electron-phonon interaction with multiple LOphonon branches, and the degeneracy and the anisotropy of the Ti t2g conduction band. Based on the Fröhlich interaction, the many-body large-polaron theory provides an interpretation for the essential characteristics, except -interestingly -for the unexpectedly large intensity of a peak at ∼ 130 meV, of the observed optical conductivity spectra of SrTi1−xNbxO3 without any adjustment of material parameters.

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Section: Optical Conductivity Of a Gas Of Large Polaronsmentioning

confidence: 94%

“…However, that assumption contradicts the interpretation of transport measurements [29], which rather support the large-polaron picture. Also the heat capacity measurements [30], provide effective masses similar to those of large polarons. In Ref.…”

Section: Introductionmentioning

confidence: 94%

Many-body large polaron optical conductivity inSrTi1−xNbxO3

et al. 2010

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“…the vector potential (A) as well as the wave function (ψ) in BCS and GL theory varies slowly in a range of ξ, which requires ξ much smaller than the penetration length (λ) [36]. The local condition is satisfied in SrTi 1−x Nb x O 3 in which H c1 is two orders of magnitude smaller than H c2 [37] and is strengthened by defect scattering induced by electron irradiation. From both fits, ξ 0 is close to the BCS coherence length (ξ BCS ), which can be estimated to be ξ BCS = v F /π∆(0) ∼ 140 nm.…”

Section: Methodsmentioning

confidence: 99%

s-wave superconductivity in optimally dopedSrTi1−xNbxO3unveiled by electron irradiation

et al. 2015

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We report on a study of electric resistivity and magnetic susceptibility measurements in electron irradiated SrTi0.987Nb0.013O3 single crystals. Point-like defects, induced by electron irradiation, lead to an almost threefold enhancement of the residual resistivity, but barely affect the superconducting critical temperature (Tc). The pertinence of Anderson's theorem provides strong evidence for a s-wave superconducting order parameter. Stronger scattering leads to a reduction of the effective coherence length (ξ) and the deduced coherence length in the clean limit (ξ0) is around the BCS coherence length (ξBCS). Combined with thermal conductivity data pointing to multiple nodeless gaps, the current results identify optimally doped SrTi1−xNbxO3 as a multi-band s-wave superconductor.

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“…Generally, STO is a nonpolar band insulator with an indirect bandgap of ∼3.27 eV [4] and a large dielectric constant ε r [5]. A semiconducting (or metallic) phase of STO can be obtained by reduction [6], chemical doping [7] or photo-carrier injection [8], with a high carrier mobility (>10,000 cm 2 V −1 s −1 ) at low temperatures, a large density-of-states effective mass m D = 5∼6m 0 [9,10] and a large cyclotron mass m c = 1.5∼2.9m 0 [10], where m 0 is the electron rest mass. The high mobility carriers allow the observation of magnetic quantum effects like Shubnikov-de Haas oscillation.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-field induced resistivity minimum with in-plane linear magnetoresistance of the Fermi liquid in SrTiO3−xsingle crystals

et al. 2012

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We report novel magnetotransport properties of the low temperature Fermi liquid in SrTiO3−x single crystals. The classical limit dominates the magnetotransport properties for a magnetic field perpendicular to the sample surface and consequently a magnetic-field induced resistivity minimum emerges. While for the field applied in plane and normal to the current, the linear magnetoresistance (MR) starting from small fields (< 0.5 T) appears. The large anisotropy in the transverse MRs reveals the strong surface interlayer scattering due to the large gradient of oxygen vacancy concentration from the surface to the interior of SrTiO3−x single crystals. Moreover, the linear MR in our case was likely due to the inhomogeneity of oxygen vacancies and oxygen vacancy clusters, which could provide experimental evidences for the unusual quantum linear MR proposed by Abrikosov [A. A. Abrikosov, Phys. Rev. B 58, 2788(1998].

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Magnetization and Critical Fields of Superconducting SrTiO3

Cited by 64 publications

References 16 publications

Many-body large polaron optical conductivity inSrTi1−xNbxO3

Many-body large polaron optical conductivity inSrTi1−xNbxO3

s-wave superconductivity in optimally dopedSrTi1−xNbxO3unveiled by electron irradiation

Magnetic-field induced resistivity minimum with in-plane linear magnetoresistance of the Fermi liquid in SrTiO3−xsingle crystals

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