Muon-spin-rotation measurements of the London penetration depths in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow>

Pümpin, B.; Keller, H.; Kündig, W.; Odermatt, W.; Savić, I. M.; Schneider, J. W.; Simmler, H.; Zimmermann, Peter; Kaldis, E.; Rusiecki, S.; Maeno, Y.; Rossel, C.

doi:10.1103/physrevb.42.8019

Cited by 165 publications

(74 citation statements)

References 45 publications

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“…It was observed that first σ sc strongly increases with increasing magnetic field until reaching a maximum at µ 0 H 0.03 T and then above 0.03 T stays nearly constant up to the highest field (0.64 T) investigated. Such a behavior is expected within the London model and is typical for polycrystalline high temperature superconductors (HTS's) 67 . The observed field dependence of σ sc implies that for a reliable determination of the penetration depth the applied field must be larger than µ 0 H = 0.03 T. λ(T ) can be calculated within the local (London) approximation (λ ξ) by the following expression: 51,68…”

Section: A Magnetization and Specific Heat Capacity Experimentsmentioning

confidence: 99%

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

et al. 2016

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Probing the pairing symmetry in the over-doped Fe- We report muon spin rotation experiments on the magnetic penetration depth λ and the temperature dependence of λ −2 in the over-doped Fe-based high-temperature superconductor (Fe-HTS) Ba1−xRbxFe2As2 (x = 0.65) studied at ambient and under hydrostatic pressures up to p = 2.3 GPa. We find that in this system λ −2 (T ) is best described by d-wave scenario. This is in contrast to the case of the optimally doped x = 0.35 system which is known to be a nodeless s +− -wave superconductor. This suggests that the doping induces the change of the pairing symmetry from s +− to d-wave in Ba1−xRbxFe2As2. In addition, we find that the d-wave order parameter is robust against pressure, suggesting that d is the common and dominant pairing symmetry in over-doped Ba1−xRbxFe2As2. Application of pressure of p = 2.3 GPa causes a decrease of λ(0) by less than 5 %, while at optimal doping x = 0.35 a significant decrease of λ(0) was reported. The superconducting transition temperature Tc as well as the gap to Tc ratio 2∆/kBTc show only a modest decrease with pressure. By combining the present data with those previously obtained for optimally doped system x = 0.35 and for the end member x = 1 we conclude that the SC gap symmetry as well as the pressure effects on the SC quantities strongly depend on the Rb doping level. These results are discussed in the light of the putative Lifshitz transition, i.e., a disappearance of the electron pockets in the Fermi surface of Ba1−xRbxFe2As2 upon hole doping.

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Section: A Magnetization and Specific Heat Capacity Experimentsmentioning

confidence: 99%

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

et al. 2016

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“…Early µSR measurements of σ were used to deduce information about 1/λ 2 ab using equations (10) and (11). From observations of a weak temperature dependence for σ at low T it was concluded that the pairing state symmetry of high-T c superconductors is s-wave [17,18,19,20]. A linear scaling of T c with σ was also found (the so-called 'Uemura plot'), which has been interpreted via equation (10) to imply T c ∝ 1/λ 2 ab , which in turn is proportional to the superfluid density n s [21,22].…”

Section: The Muon Depolarization Ratementioning

confidence: 99%

Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors

Sonier

2007

Rep. Prog. Phys.

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The focus of this article is on recent progress in muon spin rotation (µSR) studies of the vortex cores in type-II superconductors. By comparison of µSR measurements of the vortex-core size in a variety of materials with results from techniques that directly probe electronic states, the effect of delocalized quasiparticles on the spatial variation of field in a lattice of interacting vortices has been determined for both single-band and multi-band superconductors. These studies demonstrate the remarkable accuracy of what some still consider an exotic technique. In recent years µSR has also been used to search for magnetism in and around the vortex cores of high-temperature superconductors. As a local probe µSR is specially suited for detecting static or quasistatic magnetism having short-range or random spatial correlations. As discussed in this review, µSR experiments support a generic phase diagram of competing superconducting and magnetic order parameters, characterized by a quantum phase transition to a state where the competing order is spatially non-uniform.

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“…A detailed description of the TF-µSR technique and its use in determining n s for polycrystalline HTSC samples is given in reference [13]. A Gaussian relaxation function has been used to fit the measured time spectra.…”

mentioning

confidence: 99%

“…A Gaussian relaxation function has been used to fit the measured time spectra. From the obtained Gaussian depolarisation rate, σ, we deduced the magnetic penetration depth, λ ab , and the ratio of n s to the effective carrier mass m * ab using the established relationship [7,13]: [7,8,11].…”

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confidence: 99%

Anomalous Peak in the Superconducting Condensate Density of Cuprate High-TcSuperconductors at a Unique Doping State

Tallon²,

et al. 2001

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The doping dependence of the superconducting condensate density, n o s , has been studied by muon-spin-rotation for Y 0. The superconducting condensate density, n s , is proportional to the squared amplitude of the superconducting (SC) order parameter (OP), i.e. of the macroscopic wave function which describes the SC charge carriers. It is thus a fundamental parameter whose variation as a function of temperature (T) and of carrier doping provides important information about the

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Muon-spin-rotation measurements of the London penetration depths inYBa2Cu3

Cited by 165 publications

References 45 publications

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors

Anomalous Peak in the Superconducting Condensate Density of Cuprate High-TcSuperconductors at a Unique Doping State

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