Two types of Hc2(T) dependences in Bi2Sr2Ca1−xYxCu2O8+δ with different Yttrium content

We report a comprehensive transverse-field SR study of Cu x TiSe 2 . The magnetic penetration depth was found to saturate at low temperature as expected in an s-wave superconductor. As x is increased we find that the superfluid density increases and the size of the superconducting gap, calculated from the temperature dependence of the superfluid density, is approaching the BCS value. However, for low values of x, the gap is smaller than the weak-coupling BCS prediction suggesting that two superconducting gaps are present in the sample.

show abstract

“…10 For the case of a perfect vortex lattice in a single-gap s-wave SC, there is a very good approximation by Brandt, 11 …”

Section: ͑1͒mentioning

confidence: 99%

“…This length scale is expected to be field independent for a single s-wave gap SC. 10 In Fig. 4͑a͒, we show the field dependence of SC for the x = 0.081 sample, taken at T = 1.7 K. The solid line is a fit to the data using Eq.…”

Section: ͑1͒mentioning

confidence: 99%

Possible evidence of a two-gap structure for theCuxTiSe2superconductor

et al. 2010

View full text Add to dashboard Cite

show abstract

“…The penetration depth measured by µSR is calculated by measuring the length-scale associated with the decay of the super-currents around the vortex-core. This length-scale is expected to be field-independent for a single s-wave gap SC [10]. In Fig.…”

Section: Figmentioning

confidence: 88%

“…In general, extracting the penetration depth from the µSR line width, σ, is not a simple task [10]. For the case of a perfect vortex-lattice in a single-gap s-wave SC, there is a very good approximation by Brandt [11], based on a numerical solution of the Ginzburg-Landau equations.…”

Section: Figmentioning

confidence: 99%

Possible evidence for two-gap superconductivity in TiSe_2Cu_x

Zaberchik¹,

Chashka²,

Patlgan³

et al. 2010

Preprint

View full text Add to dashboard Cite

We report a comprehensive TF-µSR study of CuxTiSe2. The magnetic penetration depth was found to saturate at low temperature as expected in an s-wave SC. As x is increased we find that the superfluid density increases and the size of the superconducting gap, calculated from the temperature dependence of the superfluid density, is approaching the BCS value. However, for low values of x, the gap is smaller than the weak-coupling BCS prediction suggesting that two superconducting gaps are present in the sample.

show abstract

“…12 This approach turned out to be quite effective for the analysis of reversible magnetization data. 12,13,14,15,16,17,18,19,20 The main and unexpected result of these analyses is that all numerous HTSC's may be divided into two groups. The dependencies of the normalized upper critical field H c2 on T /T c for HTSCs belonging to the same group are practically identical, while they are distinctly different between the groups.…”

mentioning

confidence: 99%

Comparison of the scaling analysis of the mixed-state magnetization data with direct measurements of the upper critical field in Y-123

Landau

2008

Preprint

View full text Add to dashboard Cite

By comparison of recent direct measurements of the temperature dependence of the upper critical field Hc2 in an YBa2Cu3O7−x high-Tc superconductor with the scaling analysis of magnetization data, collected in fields H ≪ Hc2, we demonstrate that that the temperature dependence of the Ginzburg-Landau parameter κ is negligible. Another conclusion is that the normalized temperature dependence of Hc2 is independent of the orientation of the magnetic field in respect to crystallographic axes of the sample. We also discuss that isotropy of the temperature dependence of Hc2 straightforwardly follows from the Ginzburg-Landau theory if κ does not depend on temperature.

show abstract

Two types of Hc2(T) dependences in Bi2Sr2Ca1−xYxCu2O8+δ with different Yttrium content

Cited by 7 publications

References 20 publications

Possible evidence of a two-gap structure for theCuxTiSe2superconductor

Possible evidence of a two-gap structure for theCuxTiSe2superconductor

Possible evidence for two-gap superconductivity in TiSe_2Cu_x

Comparison of the scaling analysis of the mixed-state magnetization data with direct measurements of the upper critical field in Y-123

Contact Info

Product

Resources

About