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Biswas, Amlan; Fournier, P.; Qazilbash, M. M.; Smolyaninova, Vera N.; Balci, Hamza; Greene, R. L.

doi:10.1103/physrevlett.88.207004

Cited by 175 publications

(132 citation statements)

References 40 publications

(44 reference statements)

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“…However, this has been contrasted by tunnelling [12,13] and some other specific heat [14] and penetration depth measurements [15,16,17]. In particular, there may be a crossover from d-wave to s-wave symmetries by changing the doped electron concentration [18,19] or decreasing temperature [20]. Although such a crossover may explain the conflicting experimental results on the pairing symmetry in the electron-doped cuprates, the characteristics of such possible s-wave pairing symmetry has yet to be established.…”

Section: Introductionmentioning

confidence: 82%

“…For example the phase sensitive measurements [6,7] may selectively detect the gap information from band-2 which crosses the Fermi surface near (π/2, π/2). In addition, such inter-band mixture may also be responsible to the doping dependent pairing symmetry observed in P r 2−x Ce x CuO 4 thin films [19]. In any case, the s-wave pairing symmetry appears to be an important component in the superconductivity of optimally-doped NCCO.…”

Section: B Theoretical Model -S-wave Btk Theorymentioning

confidence: 99%

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Distinct pairing symmetries inNd1.85Ce0.15CuO4−yandLa1.89

et al. 2005

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We used point-contact tunnelling spectroscopy to study the superconducting pairing symmetry of electron-doped N d1.85Ce0.15CuO4−y (NCCO) and hole-doped La1.89Sr0.11CuO4 (LSCO). Nearly identical spectra without zero bias conductance peak (ZBCP) were obtained on the (110) and (100) oriented surfaces (the so-called nodal and anti-nodal directions) of NCCO. In contrast, LSCO showed a remarkable ZBCP in the nodal direction as expected from a d-wave superconductor. Detailed analysis reveals an s-wave component in the pairing symmetry of the NCCO sample with ∆/kBTc = 1.66, a value remarkable close to that of a weakly coupled BCS superconductor. We argue that this s-wave component is formed at the Fermi surface pockets centered at (±π,0) and (0,±π) although a d-wave component may also exist.

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Section: Introductionmentioning

confidence: 82%

Section: B Theoretical Model -S-wave Btk Theorymentioning

confidence: 99%

Distinct pairing symmetries inNd1.85Ce0.15CuO4−yandLa1.89

et al. 2005

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“…The equation (26) for the field mixes components of the penetration depth and has a less direct interpretation than Eq. (25).…”

Section: Penetration Depth In Anisotropic Samplesmentioning

confidence: 99%

Magnetic penetration depth in unconventional superconductors

Prozorov

Giannetta

2006

Supercond. Sci. Technol.

396

438

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Abstract. This topical review summarizes various features of magnetic penetration depth in unconventional superconductors. Precise measurements of the penetration depth as a function of temperature, magnetic field and crystal orientation can provide detailed information about the pairing state. Examples are given of unconventional pairing in hole-and electron-doped cuprates, organic and heavy fermion superconductors. The ability to apply an external magnetic field adds a new dimension to penetration depth measurements. We discuss how field dependent measurements can be used to study surface Andreev bound states, nonlinear Meissner effects, magnetic impurities, magnetic ordering, proximity effects and vortex motion. We also discuss how penetration depth measurements as a function of orientation can be used to explore superconductors with more than one gap and with anisotropic gaps. Details relevant to the analysis of penetration depth data in anisotropic samples are also discussed.Keywords: penetration depth, unconventional superconductivity, pairing symmetry IntroductionThe early suggestion that high temperature superconductors might exhibit unconventional, d-wave pairing, [24,11,154,8] has lead to a wide variety of new experimental probes with sensitivity sufficient to test this hypothesis. The pioneering work of Hardy and coworkers demonstrated that high resolution measurements of the London penetration depth could detect the presence of nodal quasiparticles characteristic of a d-wave pairing state [87]. Since that time, a large number of new superconductors have been discovered, many of which exhibit nontrivial departures from BCS behavior. As we show in this review, penetration depth measurements can be used to examine not only nodal quasiparticles but two-gap superconductivity, anisotropy of the energy gap, Andreev surface states, nonlinear Meissner effect, interplane transport, proximity coupled diamagnetism, vortex matter and the coexistence of magnetism and superconductivity, to name several problems of current interest.

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“…We consider mixed symmetries, including a small isotropic component to the d-waves, such that the magnitude and phase of the pair potential are affected [39][40][41].…”

Section: Resultsmentioning

confidence: 99%

“…For this, we use the Hamiltonian approach and the non-equilibrium Green functions in Keldysh formalism. We consider typical pair potential symmetries for cuprates and iron based superconductors which means d, s ++ and s +− symmetries [39][40][41][42][43][44][45][46]. In addition, we consider a s-wave compound added to the d-wave superconductors, thus we study how the magnitude and phase of the pair potential affect the noise cross-correlation.…”

Section: Introductionmentioning

confidence: 99%

Noise cross-correlation and Cooper pair splitting efficiency in multi-teminal superconductor junctions

Gil

Herrera

2017

Solid State Communications

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We analyze the non-local shot noise in a multi-terminal junction formed by two Normal metal leads connected to one superconductor. Using the cross Fano factor and the shot noise, we calculate the efficiency of the Cooper pair splitting. The method is applied to d-wave and iron based superconductors. We determine that the contributions to the noise cross-correlation are due to crossed Andreev reflections (CAR), elastic cotunneling, quasiparticles transmission and local Andreev reflections. In the tunneling limit, the CAR contribute positively to the noise cross-correlation whereas the other processes contribute negatively. Depending on the pair potential symmetry, the CAR are the dominant processes, giving as a result a high efficiency for Cooper pair split. We propose the use of the Fano factor to test the efficiency of a Cooper pair splitter device.

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Evidence of ad- tos-Wave Pairing Symmetry Transition in the Electron-Doped Cuprate SuperconductorPr2

Cited by 175 publications

References 40 publications

Distinct pairing symmetries inNd1.85Ce0.15CuO4−yandLa1.89

Distinct pairing symmetries inNd1.85Ce0.15CuO4−yandLa1.89

Magnetic penetration depth in unconventional superconductors

Noise cross-correlation and Cooper pair splitting efficiency in multi-teminal superconductor junctions

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