Superconducting Fluctuations and Excess Conductivity Analysis of Te-Substituted TlSr2(Ca1−x Te x )Cu2O7−δ

Al-Sharabi, Annas; Abd‐Shukor, R.

doi:10.1007/s10948-015-3078-6

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…The c lattice parameter increased as Te was substituted, and this may be due to the ionic radius of Te 4+ = 0.97 Å being substituted for smaller Tl 3+ = 0.885 Å. Hence, it is suggested that the effective ionic radius for this work is Te 4+ = 0.97 Å in comparison to Te 6+ = 0.56 Å [25] as a result of the increment in the lattice parameters. The decreasing trend of the c lattice parameter with the substitution of Cr, Bi, Pb, and Se as in Table 1 is possibly due to their smaller ionic radii being substituted at the Tl site.…”

Section: Xrd Patternsmentioning

confidence: 84%

Elemental Substitution at Tl Site of Tl1−xXx(Ba, Sr)CaCu2O7 Superconductor with X = Cr, Bi, Pb, Se, and Te

2023

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The effects of elemental substitutions at the Tl site of a Tl1−xXx(Ba, Sr)CaCu2O7 superconductor with X = Cr, Bi, Pb, Se, and Te were investigated. This study aimed to determine the elements that enhance and suppress the superconducting transition temperature of the Tl1−xXx(Ba, Sr)CaCu2O7 (Tl-1212) phase. The selected elements belong to the groups of transition metal, post-transition metal, non-metal, and metalloid. The relationship between the transition temperature and ionic radius of the elements was also discussed. The samples were prepared by the solid-state reaction method. The XRD patterns showed a single Tl-1212 phase was formed in the non- and Cr-substituted (x = 0.15) samples. The Cr-substituted samples (x = 0.4) showed a plate-like structure with smaller voids. The highest superconducting transition temperatures (Tc onset, Tcχ′, and Tp) were also achieved by the Cr-substituted samples for x = 0.4 compositions. However, the substitution of Te suppressed the superconductivity of the Tl-1212 phase. Jc inter (Tp) for all samples was calculated to be in the range of 12–17 A/cm2. This work shows that substitution elements with a smaller ionic radius tend to be more favorable in improving the superconducting properties of the Tl-1212 phase.

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Section: Xrd Patternsmentioning

confidence: 84%

Elemental Substitution at Tl Site of Tl1−xXx(Ba, Sr)CaCu2O7 Superconductor with X = Cr, Bi, Pb, Se, and Te

2023

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“…A minor Tc substitution in the Tl-2223 phase at Ca site boosted Tc to 120 K and substantially encouraged the formation of the Tl-2223 phase in bulk samples [14]. The transition temperature, Tc, of TlSr2Ca1-xTexCu2O7 improved as the Te content rose [15]. Tc was found to be around 92 to 97 K when Te was substituted in (Tl0.5Pb0.5)Sr2CaCu2O7 [16].…”

Section: Introductionmentioning

confidence: 97%

AC Susceptibility and Superconducting Properties of Te-Substituted TlSr2Ca(Cu2-xTex)O7

Ilhamsyah,

Abd-Shukor,

Norazimah

et al. 2023

MSF

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The effect of Te substitution on TlSr2Ca(Cu2-xTex)O7 for x = 0.2, 0.3, 0.4, and 0.5 was investigated. The solid-state reaction approach was used to prepare the samples. All TlSr2Ca(Cu2-xTex)O7 samples exhibited the presence of major Tl-1212 and minor Tl-1201 phases. Further Te replacement promoted the formation of the Tl-1201 phase. All samples demonstrated metallic normal state characteristics before onset transition temperature, Tc-onset. The resistance versus temperature curve for all samples revealed that the Tc-onset was between 46 and 40 K and the zero-resistance temperature, Tc-zero was between 29 and 37 K. The measurement of AC susceptibility revealed a susceptibility superconducting transition Tc χ' ranging from 30 to 36 K. This study showed that Te substitution stabilized the Tl-1212 phase, enhanced Tc χ’ although the Tc-onset and Tc-zero were below the boiling point of liquid nitrogen.

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“…The formation of conducting pairs just above Tc has been attributed to superconducting order parameter fluctuations, which plays an important role in specifying the superconducting properties [11][12][13][14]. For better understanding the intrinsic properties of the superconductors such as coherence lengths, the effective inter-layering spacing and the interlayer coupling strength between the two CuO2 layers, variations of excess conductivity versus reduced temperature (t = (T -Tc)/Tc) were analyzed by using the Aslamazov-Larkin (AL) and Lawrence -Doniach (LD) models [11,13].…”

Section: Introductionmentioning

confidence: 99%

Excess Conductivity Analyses in Bi-Pb-Sr-Ca-Cu-O Systems Sintered at Different Temperatures

Dung¹,

An²,

Duong³

et al. 2021

MaP

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This paper studies the effects of the sintering temperature on crystal structure, critical temperature (Tc) and excess conductivity of Bi-Pb-Sr-Ca-Cu-O (BPSCCO) system. Bulk BPSCCO samples were fabricated by the solid-state reaction method. Four different temperatures of 835 °C, 840 °C, 845 °C, and 850 °C were applied to sinter four different samples. The crystal structure of the samples was investigated through X-ray diffraction measurements (XRD) and scanning electron microscopy (SEM). Superconductivity of the samples was analyzed by the temperature-dependent resistivity measurement. The experimental results showed the existence of both Bi-2223 and Bi-2212 phases in all samples. Quantitatively, the volume fraction of the Bi-2223 phase was found to increase from 53.56% to 75.97%, and the average grain size of Bi-2223 phase was observed to enlarge from 57.95 nm to 86.50 nm as the sintering temperature increased from 835 °C to 850 °C. In addition, the excess conductivity analyses based on the theory of Aslamazov - Larkin (AL) and Lawrence - Doniach (LD) showed decreases in the coherence lengths (ξc(0)) from 1.957 Å to 1.565 Å and the effective inter-layering spacing (d) from 79.7 Å to 64.5 Å. Meanwhile, the interlayer coupling strength (J) between two CuO2 planes was estimated to increase from 0.00083 to 0.00137. These results might be evidence to conclude that the increasing of the sintering temperature obviously improves the superconductivity in the BPSCCO system.

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Superconducting Fluctuations and Excess Conductivity Analysis of Te-Substituted TlSr2(Ca1−x Te x )Cu2O7−δ

Cited by 7 publications

References 28 publications

Elemental Substitution at Tl Site of Tl1−xXx(Ba, Sr)CaCu2O7 Superconductor with X = Cr, Bi, Pb, Se, and Te

Elemental Substitution at Tl Site of Tl1−xXx(Ba, Sr)CaCu2O7 Superconductor with X = Cr, Bi, Pb, Se, and Te

AC Susceptibility and Superconducting Properties of Te-Substituted TlSr<sub>2</sub>Ca(Cu<sub>2-x</sub>Te<sub>x</sub>)O<sub>7</sub>

Excess Conductivity Analyses in Bi-Pb-Sr-Ca-Cu-O Systems Sintered at Different Temperatures

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