Two-Band Superconductivity in Nb-Doped 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>

Binnig, G.; Baratoff, A.; Hoenig, H. E.; Bednorz, J. G.

doi:10.1103/physrevlett.45.1352

Cited by 284 publications

(240 citation statements)

References 16 publications

(6 reference statements)

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“…INTRODUCTION SrTiO 3 (STO) exhibits a host of interesting phenomena ranging from being a quantum paraelectric insulator 1 to a ferroelectric under strain 2 and a metal 3 or superconductor 4 when doped and hence has been one of most extensively studied perovskite oxides. These diverse properties make it an attractive choice for many applications such as oxidebased electronics, 5 photocatalysis, and as electrodes 6 in solid oxide fuel cells.…”

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confidence: 99%

Effect of oxygen vacancy distribution on the thermoelectric properties of La-doped SrTiO3 epitaxial thin films

Kumar

Abutaha

Hedhili

et al. 2012

Journal of Applied Physics

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A detailed study of the role of oxygen vacancies in determining the effective mass and high temperature (300–1000 K) thermoelectric properties of La-doped epitaxial SrTiO3 thin films is presented. It is observed that at intermediate temperatures, a transition from degenerate to non-degenerate behavior is observed in the Seebeck coefficient, but not electrical conductivity, which is attributed to heterogeneous oxygen non-stoichiometry. Heikes formula is found to be invalid for the films with oxygen vacancies. By fitting the spectroscopic ellipsometry (SE) data, obtained in the range 300–2100 nm, using a Drude-Lorentz dispersion relation with two Lorentz oscillators, the electrical and optical properties of the films are extracted. Using the excellent agreement between the transport properties extracted from SE modeling and direct electrical measurements, we demonstrate that an increase in concentration of oxygen vacancies results in a simultaneous increase of both carrier concentration and electron effective mass, resulting in a higher power factor.

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confidence: 99%

Effect of oxygen vacancy distribution on the thermoelectric properties of La-doped SrTiO3 epitaxial thin films

Kumar

Abutaha

Hedhili

et al. 2012

Journal of Applied Physics

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“…in Nb doped SrTiO 3 [4] and believed to be a rare exception in superconductors. Since the discovery of TGS in MgB 2 , many more superconductors with TGS were found, including heavy fermion compounds, making this feature more common than believed early on.…”

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confidence: 99%

“…Since the discovery of TGS in MgB 2 , many more superconductors with TGS were found, including heavy fermion compounds, making this feature more common than believed early on. In all of the above mentioned superconductors, the combined order parameters exhibit always the same symmetry, namely s + s in Nb doped SrTiO 3 [4] and MgB 2 [5] and d + d in heavy fermion compounds [6]. A totally novel situation is met in cuprate hightemperature superconductors (HTS), since the order parameters are of different symmetries, i.e., s + d [7][8][9][10][11][12][13].…”

mentioning

confidence: 99%

s-Wave Symmetry Along the c-Axis and s+d In-plane Superconductivity in Bulk YBa2Cu4O8

Khasanov

Shengelaya

Karpiński

et al. 2007

J Supercond Nov Magn

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To clarify the order parameter symmetry of cuprates, the magnetic penetration depth λ was measured along the crystallographic directions a, b, and c in single crystals of YBa 2 Cu 4 O 8 via muon spin rotation. This method is direct, bulk sensitive, and unambiguous. The temperature dependences of λ −2 a and λ −2 b exhibit an inflection point at low temperatures as is typical for two-gap superconductivity (TGS) with s + d-wave character in the planes. Perpendicular to the planes a pure s-wave gap is observed thereby highlighting the important role of c-axis effects. We conclude that these are generic and universal features in the bulk of cuprates. Recently, new muon spin rotation (μSR) investigations of single crystal La 1.83 Sr 0.17 CuO 4 detected an inflection point in the temperature dependence of the inverse-squared in-plane magnetic penetration depth λ −2 ab , which is a direct consequence of two superconducting gaps with largely different zero temperature gap values [14]. Since it is unclear whether these observations are a material specific property or generic and intrinsic to HTS, the previous μSR studies were extended to single crystal YBa 2 Cu 4 O 8 and were performed by applying a magnetic field along the crystallographic directions a, b, and c. Thereby we obtain the three principle components of the second moments of the local magnetic field distribution P (B) in the mixed state, which are related to the superfluid density, and reflect directly the corresponding penetration depths λ a , λ b , and λ c . While λ −2 a and λ −2 b vary almost linearly with temperature for 20 < T < 50 K, as is expected for a d-wave order parameter, the c-axis response (λ −2 c ) saturates below 30 K, as expected for a s-wave order parameter. In addition, λ −2 a and PACS

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“…We consider the s-wave superconductivity as expected in the bulk STO [17]. For simplicity, we take into account the intraorbital attractive interaction U < 0 and the interorbital attractive interaction U < 0 in the spin-singlet channel;…”

Section: Modelmentioning

confidence: 99%

Theory of Multi-Orbital Superconductivity in SrTiO₃/LaAlO₃Interface

Nakamura¹,

Yanase²

2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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We investigate the superconductivity in two-dimensional electron systems formed in SrTiO 3 nanostructures. Our theoretical analysis is based on the three-orbital model, which takes into account t 2g orbitals of Ti ions. We find that the Rashba spin-orbit coupling stabilizes a quasi-one-dimensional superconducting phase at high magnetic fields along interfaces. This quasi-one-dimensional superconducting phase is protected against paramagnetic depairing effects by the Rashba spin-orbit coupling and realizes a large upper critical field H c2 beyond the Pauli-Clogston-Chandrasekhar limit.

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Two-Band Superconductivity in Nb-Doped SrTiO3

Cited by 284 publications

References 16 publications

Effect of oxygen vacancy distribution on the thermoelectric properties of La-doped SrTiO3 epitaxial thin films

Effect of oxygen vacancy distribution on the thermoelectric properties of La-doped SrTiO3 epitaxial thin films

s-Wave Symmetry Along the c-Axis and s+d In-plane Superconductivity in Bulk YBa2Cu4O8

Theory of Multi-Orbital Superconductivity in SrTiO₃/LaAlO₃Interface

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Two-Band Superconductivity in Nb-Doped SrTiO3

Cited by 284 publications

References 16 publications

Effect of oxygen vacancy distribution on the thermoelectric properties of La-doped SrTiO3 epitaxial thin films

Effect of oxygen vacancy distribution on the thermoelectric properties of La-doped SrTiO3 epitaxial thin films

s-Wave Symmetry Along the c-Axis and s+d In-plane Superconductivity in Bulk YBa2Cu4O8

Theory of Multi-Orbital Superconductivity in SrTiO3/LaAlO3Interface

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Theory of Multi-Orbital Superconductivity in SrTiO₃/LaAlO₃Interface