Anisotropy of Bi2Sr2CaCu2O8+y revisited

Iye, Yasuhiro; Oguro, I.; Tamegai, T.; Datars, W. R.; Motohira, N.; Kitazawa, K.

doi:10.1016/0921-4534(92)90554-p

Cited by 94 publications

(40 citation statements)

References 31 publications

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“…We measured the angular (θ) dependence of resistivity (ρ) in the flux liquid state under various magnetic fields (H) and calculated superconducting anisotropy (γ s ) using the effective mass model [13][14][15] . respectively.…”

Section: Main Textmentioning

confidence: 99%

Superconducting Anisotropies of F-Substituted LaOBiSe₂ Single Crystals

et al. 2014

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F-substituted LaOBiSe 2 single crystals were grown using CsCl flux. The obtained single crystals showed a plate-like shape with a size of about 1.0 mm square. The c-axis lattice constant of the grown crystals was determined to be 14.114(3) Å. The superconducting critical temperature of the single crystal was approximately 3.5 K. The superconducting anisotropies were determined to be 49 and 24 using the upper critical field and the effective mass model, respectively.

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Section: Main Textmentioning

confidence: 99%

Superconducting Anisotropies of F-Substituted LaOBiSe₂ Single Crystals

et al. 2014

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“…The torque Τ as a function of angle 9H (the angle between applied field H and c-axis) shows sharp maximum near 90° and some cavity lightly below. The traditionally used phenomenology of Kogan's [2] seems to describe the behaviour of the torque in YBa2Cu3O x [3,4] well but not in higher anisotropic superconduction as Bi-and Tl-based compounds [6][7][8]. The above discrepancies are probably connected with 2D character of those superconducting materials.…”

Section: Modelmentioning

confidence: 79%

“…As reasons for rather big discrepancies of the model parameters (ε, Η c2 ) reported in various papers [5][6][7]16], except imperfections of the investigated samples, it may be that flux-pinning under the field near the (α, b) plane is not neglected completely in real crystals of HΤC-superconductors. The performed calculations and comparison with experimental data prove that the layer discreteness can modify much torque behaviour observed in the strong anisotropic bismuth family superconductors.…”

Section: Results and Conclusionmentioning

confidence: 99%

“…The magnetic torque experiments have proved to be an extremely powerful technique to obtain the square root of the effective mass ratio according to the Kogan [2] model. The valueS obtained from these measurements for ε were ε ΠΙ 8 for YBa2 Cu3 Ox [3,4], ε 55-400 for Bi 2 Sr2 CaCu2Ox [5][6][7] and ε 94 for T12 Ba2 CaCu 2 Ox [8] respectively. Rather big discrepancies among the reported in literature results for parameter ε especially for Bi compounds suggest that Kogan's formula [2] based on the anisotropic Landau model is not applicable to the highly layered anisotropic superconducting materials.…”

Section: Introductionmentioning

confidence: 99%

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Anomalous Reversible Torque in Layered Superconducting Bi₂Sr₂CaCu₂O_xSingle Crystal

et al. 1996

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Magnetic anisotropy of layered superconducting Bi2Sr2CaCu2O x single crystal was investigated by the torque metlod in the reversible regime. The torque was analyzed in the model taking into account 2D layered structure. Considered model gives the better fit to the data wlen the magnetic fieJd is applied near (a, b) plane. Obtained results establish to 6 x 10 3 value of the superconducting effective mass anisotropy coefficient ε.

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“…). The angle dependence of resistivity was also measured at various temperatures and magnetic fields for the effective mass method [18][19][20] . The R -H red curves for LFs and HFs.…”

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The effect of exceptionally high fluorine doping on the anisotropy of single crystalline SmFeAsO1−xFx

Fujioka

Denholme

Tanaka

et al. 2014

Applied Physics Letters

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We succeeded in growing single crystalline SmFeAsO 1-x F x with exceptionally high fluorine concentration by using a CsCl flux method. Comparing to conventional flux methods, this method can introduce about double the amount of fluorine into the oxygen site. The obtained single crystal shows the highest superconducting transition temperature (T c = 57.5 K) in single crystalline iron pnictides. In addition, the residual resistivity ratio (RRR) is almost three times as large as that of previously reported single crystals. This suggests that our single crystals are suitable for investigation of the intrinsic superconducting properties since they have few defects and impurities. Using both the Werthamer-Helfand-Hohenberg model and the effective mass model, we demonstrated that a higher fluorine concentration suppresses the anisotropic superconductivity of SmFeAsO 1-x F x .

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Anisotropy of Bi2Sr2CaCu2O8+y revisited

Cited by 94 publications

References 31 publications

Superconducting Anisotropies of F-Substituted LaOBiSe₂ Single Crystals

Superconducting Anisotropies of F-Substituted LaOBiSe₂ Single Crystals

Anomalous Reversible Torque in Layered Superconducting Bi₂Sr₂CaCu₂O_xSingle Crystal

The effect of exceptionally high fluorine doping on the anisotropy of single crystalline SmFeAsO1−xFx

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Anisotropy of Bi2Sr2CaCu2O8+y revisited

Cited by 94 publications

References 31 publications

Superconducting Anisotropies of F-Substituted LaOBiSe2 Single Crystals

Superconducting Anisotropies of F-Substituted LaOBiSe2 Single Crystals

Anomalous Reversible Torque in Layered Superconducting Bi2Sr2CaCu2OxSingle Crystal

The effect of exceptionally high fluorine doping on the anisotropy of single crystalline SmFeAsO1−xFx

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Product

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Superconducting Anisotropies of F-Substituted LaOBiSe₂ Single Crystals

Superconducting Anisotropies of F-Substituted LaOBiSe₂ Single Crystals

Anomalous Reversible Torque in Layered Superconducting Bi₂Sr₂CaCu₂O_xSingle Crystal