Magnetic field-induced quasiparticle excitation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Nb</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi mathvariant="normal">Sn</mml:mi></mml:mrow></mml:math>: Evidence for anisotropic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi></mml:math>-wave pairing

Kadono, R.; Satoh, Kohki; Koda, A.; Nagata, Takashi; Kawano-Furukawa, Hazuki; Suzuki, Jun–ichi; Matsuda, M.; Ohishi, Kazuki; Higemoto, Wataru; Kuroiwa, S.; Takagiwa, Hiroyuki; Akimitsu, Jun

doi:10.1103/physrevb.74.024513

Cited by 10 publications

(8 citation statements)

References 23 publications

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“…9 (those with η ≥ 1) have anisotropic superconducting gap or multi-gapped, except for the case of KOs 2 O 6 (Refs. 32,33) in which the 8,23,27,28,29,30,31,32,33,34]. Filled symbols: superconductors with anisotropic gap (circles) or multigapped (squares).…”

Section: B η As a Criterion Of Anomaly In The Order Parametermentioning

confidence: 99%

Microscopic properties of vortex states inYB6probed by muon spin rotation

et al. 2007

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The local magnetic field distribution B͑r͒ in the mixed state of a boride superconductor, YB 6 , is studied by muon spin rotation ͑SR͒. A comparative analysis using the modified London model and Ginzburg-Landau ͑GL͒ model indicates that the latter exhibits a better agreement with SR data at higher fields and thus demonstrating the importance of reproducing the field profile near the vortex cores when the intervortex distance becomes closer to the GL coherence length. The temperature and field dependence of the magnetic penetration depth ͑͒ does not exhibit any indications of the nonlocal effect or of low-lying quasiparticle excitation. This suggests that the strong coupling of electrons to the rattling motion of Y ions in the boron cage, as suggested by bulk measurements, induces a conventional superconductivity with isotropic s-wave pairing. Considering the present results, a review is provided for probing the anisotropy of the superconducting order parameters by the slope of against the field ͑ ϰ d / dH͒.

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Section: B η As a Criterion Of Anomaly In The Order Parametermentioning

confidence: 99%

Microscopic properties of vortex states inYB6probed by muon spin rotation

et al. 2007

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“…Another uncertainty comes from the fact that the FLL symmetry in SLCO is not known at this stage, and it might even depend on the magnitude of external field as has been found in some other cuprates. 21,22 However, since we do not observe any abrupt change of lineshape nor the increase of χ 2 in the fits (irrespective of model) associated with the alteration of FLL symmetry with varying field, 23,24 we can reasonably assume that the FLL symmetry remains the same throughout entire field range. Moreover, the observed lineshape is perfectly in line with the hexagonal FLL, without showing any sign of squared FLL (e.g., a large spectral weight at the lower field side of the central peak in the absence of nonlocal effect 25 , or an enhanced weight at the central peak associated with the strong nonlocal effect 24 ).…”

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confidence: 55%

Fermi-liquid behavior and weakly anisotropic superconductivity in the electron-doped cuprateSr1−xLaxCuO2

et al. 2008

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The microscopic details of flux-line lattice state studied by muon spin rotation are reported in an electrondoped high-T c cuprate superconductor, Sr 1−x La x CuO 2 ͑SLCO͒ ͑x = 0.10-0.15͒. A clear sign of phase separation between magnetic and nonmagnetic phases is observed, where the effective magnetic penetration depth ͓ ϵ ͑T , H͔͒ is determined selectively for the latter phase. The extremely small value of ͑0,0͒ and corresponding large superfluid density ͑n s ϰ −2 ͒ is consistent with the presence of a large Fermi surface with carrier density of 1 + x, which suggests the breakdown of the "doped Mott insulator" even at the "optimal doping" in SLCO. Moreover, a relatively weak anisotropy in the superconducting order parameter is suggested by the field dependence of ͑0,H͒. These observations strongly suggest that the superconductivity in SLCO is of a different class from hole-doped cuprates.The question whether or not the mechanism of superconductivity in electron-doped ͑n-type͒ cuprates is common to that in hole-doped ͑p-type͒ cuprates is one of the most interesting issues in the field of cuprate superconductors, which is yet to be answered. This "electron-hole symmetry" has been addressed by many experiments and theories since the discovery of n-type cuprate superconductors. 1 In the theoretical models assuming strong electronic correlation where the infinitely large on-site Coulomb interaction ͑U → ϱ͒ leads to the Mott insulating phase for the half filled band, the correlation among the doped carriers is projected into the t-J model in which the mechanism of superconductivity does not depend on the sign of charge carriers. 2,3 This is in marked contrast to the models starting from Fermi-liquid ͑=normal metal͒ state, where such symmetry is irrelevant to their basic framework. 4 Experimentally, recent advent in crystal-growth techniques and that in experimental methods for evaluating their electronic properties triggered detailed measurements on n-type cuprates, reporting interesting results suggesting certain differences from p-type ones, such as the observation of a commensurate spin fluctuations in neutron-scattering study or the nonmonotonic d-wave superconducting order parameter in angle-resolved photoelectron spectroscopy ͑ARPES͒ measurement. 5,6 The effective magnetic penetration depth ͑͒ is one of the most important physical quantities directly related to the superfluid density ͑n s ͒,which is reflected in the microscopic field profile of the fluxline lattice ͑FLL͒ state in type II superconductors. Considering that the response of n s against various perturbations strongly depends on the characters of the Cooper pairing, the comparison of n s between two types of carriers might serve as a testing ground for the electron-hole symmetry. However, the study of FLL state in n-type cuprates such as TЈ-phase RE 2 CuO 4 compounds ͑RE= Nd, Pr, Sm, etc.͒ is far behind that in p-type cuprates because of strong random local fields from rare-earth ions which mask information of CuO 2 planes regarding both superconduct...

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“…[13][14][15][16][17][18][19][20] However, it is not easy to compare the experimental results with the prediction of the GL theory which fails in the region of T T c and does not take into account nonlocal corrections to the London equation. To avoid these difficulties we bridge in the present paper the phenomenological and microscopical theories by solving the quasiclassical Eilenberger equations 21 and NGLE for the mixed state of s-wave superconductors.…”

Section: Introductionmentioning

confidence: 96%

Quasiclassical approach to nonlocal generalized London equation in mixed state ofs-wave superconductors

2007

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We extend the Ginsburg-Landau solution for cutoff function in London equation to low temperatures by solving numerically the quasiclassical Eilenberger equations in mixed state of s-wave superconductors. As a result the nonlocal generalized London equation ͑NGLE͒ is obtained. The magnetic field and temperature dependence of the cutoff function parameter k 1 ͑B , T͒ are calculated. Due to Kramer-Pesch effect k 1 decreases strongly at low temperatures. It is also found that k 1 has a minimum at a value of magnetic field depending on temperature. We reduce the NGLE model to an effective local model and calculate the value of an effective penetration depth eff ͑B , T͒. The sublinear field dependence of eff is predicted that agrees with experimental SR results for the penetration depth of magnetic field in the s-wave superconductor V 3 Si and NbSe 2 .

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Magnetic field-induced quasiparticle excitation inNb3Sn: Evidence for anisotropics-wave pairing

Cited by 10 publications

References 23 publications

Microscopic properties of vortex states inYB6probed by muon spin rotation

Microscopic properties of vortex states inYB6probed by muon spin rotation

Fermi-liquid behavior and weakly anisotropic superconductivity in the electron-doped cuprateSr1−xLaxCuO2

Quasiclassical approach to nonlocal generalized London equation in mixed state ofs-wave superconductors

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