Thallium-Based Superconducting Cuprates

Jorda, J. L.

doi:10.1007/3-540-27294-1_22

Cited by 2 publications

(2 citation statements)

References 194 publications

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“…Thallium based-cuprates TlmSr2Can-1CunO2n+m+2 with m = 1 and n = 2 or TlSr2CaCu2O7 superconductor (Tl-1212) is one of a series which produces unique and interesting superconductivity properties. These superconductors are easily produced compared to other thallium systems and are easily stabilized with elements that are partially substituted at various sites in TlSr2CaCu2O7 [1]. The elemental substitution or doping of different ions in the various site of cations in TlSr2CaCu2O7 has been known as one of the effective ways to optimize the hole concentration and hence stabilize the Tl-1212 phase and enhance the transition temperature.…”

Section: Introductionmentioning

confidence: 99%

Superconducting Properties of Ta Substituted (Tl_1-xTa_x)(BaSr)CaCu₂O₇

Ilhamsyah

Abd‐Shukor

Yazid

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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In this research, the effects of Ta substitution on the Tl-based superconducting materials have been investigated. The standard method of solid-state reaction was applied to prepare the (Tl1-xTax)(BaSr)CaCu2O7 superconductors of high temperature with x = 0, 0.4, 0.5 and 0.6. For all samples, temperature dependence measurements versus the electrical resistance demonstrated metallic normal state behavior. The X-ray diffraction measurement indicated coexistence of mixed phase with Tl-1212 as the major phase and Ta2O5 as an impurity for all substitution samples. A fraction with the highest volume of the Tl-1212 phase in Ta substitution samples is in x = 0.4 (67%), 30% comes from Ta2O5 and the other 3 % belongs to the Tl-1201. All samples with Ta substitution (x ≥ 0.4) showed decreased in Tc onset , Tc zero and Tp . The discussion on the effects of Ta2O5 in the Tl(BaSr)CaCu2O7 superconductors are also provided.

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Section: Introductionmentioning

confidence: 99%

Superconducting Properties of Ta Substituted (Tl_1-xTa_x)(BaSr)CaCu₂O₇

Ilhamsyah

Abd‐Shukor

Yazid

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…It is known that partial substitutions of Tl and Ba by Pb and Sr, respectively, stabilize the Tl-1223 type of the structure and improve the superconducting properties, such as J c values. It is important to stress that contrary to the non-substituted Tl-1223, the reaction pathway of the substituted (Tl,Pb)-1223 phases does not contain double Tl-O layers as (Tl-2223) but (Tl,Pb)-1212 phase with a single Tl-O layer [4,5].…”

Section: Introductionmentioning

confidence: 99%

Effects of low-level La doping and ageing on TlPb-1223 high T c superconductors

et al. 2010

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Abstract:Bulk samples of the nominal composition of (Tl 0.6 Pb 0.5 )(Sr 0.8 Ba 0.2 ) 2 Ca 2 Cu 3 O 8+δ -xLaO 1.5 (x = 0 − 0.1) were prepared by using two-step process and their microstructure, T c values, and magnetization were studied. The samples consist of the Tl-1223 dominant phase with small Tl-1212 admixture, which increases with a rise of La content. Five years ageing and following oxygen annealing at 450°C and subsequently at 750°C have only a modest effect on T c values of the studied samples. Low-level La doping (x = 0.04) leads to an increase of T c values by about 2 K in comparison with undoped samples. Oxygen annealing at 750°C results in an increase in the volume magnetization hysteresis in low applied magnetic fields and rise of critical current density at zero magnetic field and 77 K. This effect is most pronounced for the low La doped sample with x = 0.04. Changes of the induced voltage, U originating in the Meissner effect and of its harmonics in dependence on temperature were measured and used for characterization of the temperature distribution of inter-grain junctions.

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Thallium-Based Superconducting Cuprates

Cited by 2 publications

References 194 publications

Superconducting Properties of Ta Substituted (Tl_1-xTa_x)(BaSr)CaCu₂O₇

Superconducting Properties of Ta Substituted (Tl_1-xTa_x)(BaSr)CaCu₂O₇

Effects of low-level La doping and ageing on TlPb-1223 high T c superconductors

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Thallium-Based Superconducting Cuprates

Cited by 2 publications

References 194 publications

Superconducting Properties of Ta Substituted (Tl1-xTax)(BaSr)CaCu2O7

Superconducting Properties of Ta Substituted (Tl1-xTax)(BaSr)CaCu2O7

Effects of low-level La doping and ageing on TlPb-1223 high T c superconductors

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Superconducting Properties of Ta Substituted (Tl_1-xTa_x)(BaSr)CaCu₂O₇

Superconducting Properties of Ta Substituted (Tl_1-xTa_x)(BaSr)CaCu₂O₇