Systematic decrease of resistivity anisotropy in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CaCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</m

Motohashi, Teruki; Nakayama, Y.; Fujita, Takatoshi; Kitazawa, K.; Shimoyama, Jun–ichi; Kishio, K.

doi:10.1103/physrevb.59.14080

Cited by 120 publications

(58 citation statements)

References 23 publications

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“…For the ρ c measurements, voltage contacts were attached to the center of the ab plane, and the current contacts covered almost all the remaining space. 29) Magnetic fields B of up to 17.5 T were applied parallel to the c axis with a superconducting magnet.…”

Section: Methodsmentioning

confidence: 99%

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

et al. 2014

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To investigate the relationship between the pseudogap and superconductivity, we measured both the in-plane (ρ ab ) and out-of-plane (ρ c ) resistivity for oxygen-controlled Bi 2 Sr 2 CaCu 2 O 8+δ single crystals subject to magnetic fields (parallel to the c axis) of up to 17.5 T. The onset temperature for the superconductive fluctuation, T sc f , is determined by the large positive in-plane magnetoresistance (MR) and negative out-of-plane MR observed near T c , whereas the pseudogap opening temperature T * is determined by the semiconductive upturn of the zero-field ρ c . T sc f was found to scale roughly as T c , with a decreasing temperature interval between them upon doping. On the other hand, T * starts out much higher than T sc f but decreases monotonically upon doping; finally, at a heavily overdoped state, it is not observed above T sc f . These results imply that the pseudogap is not a simple precursor of superconductivity, but that further study is needed to determine whether or not T * exists below T sc f in the heavily overdoped state.

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Section: Methodsmentioning

confidence: 99%

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

et al. 2014

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“…Furthermore, it has been found to decrease the anisotropy at high temperatures 11 . In these Pb-doped crystals it is well established the existence of two alternating Bi(Pb)-2212 phases 12 .…”

Section: Introductionmentioning

confidence: 99%

Variación de las curvas E-I en la transición normal superconductor de cerámicas texturadas BI-2212 por adición de PB

Amaveda¹,

Mora²,

Moñux³

et al. 2006

Bol. Soc. Esp. Ceram. Vidr.

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Vitreous cylinders with compositions Bi 2-x Pb x Sr 2 CaCu 2 O y , (x = 0, 0.2, 0.4 and 0.6) were prepared and used as precursors to fabricate textured bars through a laser floating zone melting method (LFZ). The resulting textured cylindrical bars were annealed, followed by their electrical characterization. The microstructure was determined and correlated with the electrical measured properties. The influence of Pb doping on the sharpness of the superconducting to normal transition on the E-I curves has been determined. The sharpest transitions have been obtained for samples doped with 0.4Pb.Keywords: Bi-2212, superconductivity, electrical properties, Pb. Variación de las curvas E-I en la transición normal superconductor de cerámicas texturadas BI-2212 por adición de PB.Se han preparado precursores de tipo vítreo en forma de cilindro con composiciones nominales Bi 2-x Pb x Sr 2 CaCu 2 O y , con x = 0, 0.2, 0.4 y 0.6. Estos cilindros se han utilizado como precursores para fabricar barras texturadas por medio de una técnica de fusión zonal inducida por láser (LFZ). Estas barras texturadas se recocieron a diferentes temperaturas y se caracterizaron eléctricamente. Además, se examinó su microestructura para correlacionarla con las propiedades eléctricas medidas. La variación de la transición del estado superconductor al normal se ha relacionado con el dopaje con Pb a través de las curvas E-I. Las mejores transiciones se han obtenido para muestras dopadas con 0.4 Pb.. Bi-2212, superconductividad, propiedades eléctricas, Pb. Palabras clave:

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“…Besides varying the sintering temperature, many researches on substituting and doping effects have also been performed to enhance the formation and stability of Bi-2223 [7]. The partial substitution of Bi with Pb has been found to be the most effective way to stabilize the Bi-2223 phase [8,9]. It was also reported that optimal concentration of Pb is 0.4 [10,11].…”

mentioning

confidence: 99%

A comparative study of enhancements of critical temperature in Bi-Pb-Sr-Ca-Cu-O superconductors

Tran

Duong

et al. 2017

MaP

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Abstract:In this work, the effects of sintering temperature and Na subtitution on zero critical temperature (T c,0 ) in Bi-Pb-Sr-Ca-Cu-O superconductors were investigated. The Bi 1.6 Pb 0.4 Sr 2 Ca 2-x Na x Cu 3 O 10+ bulk samples with x = 0.00 and 0.05 (BPSCCO) were prepared by using the solid state reaction technique at elevated sintering temperatures of 840 and 850 o C. To examine the improvements of structural and superconducting properties of the BPSCCO samples, the X-ray diffraction (XRD), scanning electronic microscope (SEM) and DC resistance versus temperature (R-T) measurements were carried out. The experimental findings exhibit a co-existence of the high T c (Bi-2223) and low T c (Bi-2212) phases in all samples. The estimated volume fraction of the Bi-2223 phase was increased from 71.4 to 75.7%, and the average size of the Bi-2223 grains was enlarged from 4.5 to 9.8 m as changing the sample preparation conditions. The improved connectivities between the Bi-2223 grains were also obtained by quantitively analyzing the relation between T c,0 and residual resistance ratio (RRR). These improvements were likely to be reasons for the enhancements of T c,0 in the BPSCCO samples.

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Systematic decrease of resistivity anisotropy inBi2Sr2CaCu2

Cited by 120 publications

References 23 publications

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Variación de las curvas E-I en la transición normal superconductor de cerámicas texturadas BI-2212 por adición de PB

A comparative study of enhancements of critical temperature in Bi-Pb-Sr-Ca-Cu-O superconductors

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Systematic decrease of resistivity anisotropy inBi2Sr2CaCu2

Cited by 120 publications

References 23 publications

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi2Sr2CaCu2O8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi2Sr2CaCu2O8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Variación de las curvas E-I en la transición normal superconductor de cerámicas texturadas BI-2212 por adición de PB

A comparative study of enhancements of critical temperature in Bi-Pb-Sr-Ca-Cu-O superconductors

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Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements