### Abstract

Samples with the nominal starting compositions of TlSr_{2}(Ca _{1-x}Re_{x})Cu_{2}O_{7-δ} (x=0.05, 0.10, 0.15, 0.20, 0.25, and 0.30) were prepared using a solid state reaction. The samples were studied using powder X-ray diffraction, energy dispersive X-ray analysis and electrical resistance measurements. An excess conductivity analysis was carried out using the Aslamazov-Larkin (AL) theory, and the dimension of fluctuation induced conductivity (λ) was determined. The Lawrence-Donaich (LD) theory was used to calculate the coherence length (ξ_{c}(0)), Josephson coupling (J), and γ=(ξ_{ab}(0)/ξ_{c}(0)) of the superconductive samples. Substituting the Re in TlSr_{2}(Ca _{1-x}Re_{x})Cu_{2}O_{7-δ} (Tl-1212) caused an initial increase in the zero-resistance-temperature (T _{c zero}). The sample where x=0.20 showed the highest T _{c onset} and T_{c zero}. The XRD patterns indicated that this sample was only Tl-1212 phase. The excess conductivity analyses showed that Re substitution induced 2D-to-3D conductivity transitions at the highest transition temperature (T_{2D-3D}) observed at x=0.15. The calculations based on the Lawrence-Doniach model revealed that the shortest coherence length and inter-plane coupling (J) occurred when x=0.30. Re in the Tl-1212 phase is in a mixed valence state (4+/5+) with an optimal value of 4.5+.

Original language | English |
---|---|

Pages (from-to) | 9383-9388 |

Number of pages | 6 |

Journal | Ceramics International |

Volume | 40 |

Issue number | 7 PART A |

DOIs | |

Publication status | Published - 2014 |

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### Keywords

- Aslamazov-Larkin theory
- Lawrence-Donaich theory
- Re substitution
- Tl-1212 phase

### ASJC Scopus subject areas

- Ceramics and Composites
- Process Chemistry and Technology
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Materials Chemistry

### Cite this

**Effect of Re substitution on the formation and fluctuation-induced conductivity of a Tl Sr _{2}(Ca_{1-x}Re_{x})Cu _{2}O_{7-δ} (x=0.05-0.30) superconductor.** / Al-Sharabi, Annas; Abd. Shukor, Roslan.

Research output: Contribution to journal › Article

_{2}(Ca

_{1-x}Re

_{x})Cu

_{2}O

_{7-δ}(x=0.05-0.30) superconductor',

*Ceramics International*, vol. 40, no. 7 PART A, pp. 9383-9388. https://doi.org/10.1016/j.ceramint.2014.02.006

}

TY - JOUR

T1 - Effect of Re substitution on the formation and fluctuation-induced conductivity of a Tl Sr2(Ca1-xRex)Cu 2O7-δ (x=0.05-0.30) superconductor

AU - Al-Sharabi, Annas

AU - Abd. Shukor, Roslan

PY - 2014

Y1 - 2014

N2 - Samples with the nominal starting compositions of TlSr2(Ca 1-xRex)Cu2O7-δ (x=0.05, 0.10, 0.15, 0.20, 0.25, and 0.30) were prepared using a solid state reaction. The samples were studied using powder X-ray diffraction, energy dispersive X-ray analysis and electrical resistance measurements. An excess conductivity analysis was carried out using the Aslamazov-Larkin (AL) theory, and the dimension of fluctuation induced conductivity (λ) was determined. The Lawrence-Donaich (LD) theory was used to calculate the coherence length (ξc(0)), Josephson coupling (J), and γ=(ξab(0)/ξc(0)) of the superconductive samples. Substituting the Re in TlSr2(Ca 1-xRex)Cu2O7-δ (Tl-1212) caused an initial increase in the zero-resistance-temperature (T c zero). The sample where x=0.20 showed the highest T c onset and Tc zero. The XRD patterns indicated that this sample was only Tl-1212 phase. The excess conductivity analyses showed that Re substitution induced 2D-to-3D conductivity transitions at the highest transition temperature (T2D-3D) observed at x=0.15. The calculations based on the Lawrence-Doniach model revealed that the shortest coherence length and inter-plane coupling (J) occurred when x=0.30. Re in the Tl-1212 phase is in a mixed valence state (4+/5+) with an optimal value of 4.5+.

AB - Samples with the nominal starting compositions of TlSr2(Ca 1-xRex)Cu2O7-δ (x=0.05, 0.10, 0.15, 0.20, 0.25, and 0.30) were prepared using a solid state reaction. The samples were studied using powder X-ray diffraction, energy dispersive X-ray analysis and electrical resistance measurements. An excess conductivity analysis was carried out using the Aslamazov-Larkin (AL) theory, and the dimension of fluctuation induced conductivity (λ) was determined. The Lawrence-Donaich (LD) theory was used to calculate the coherence length (ξc(0)), Josephson coupling (J), and γ=(ξab(0)/ξc(0)) of the superconductive samples. Substituting the Re in TlSr2(Ca 1-xRex)Cu2O7-δ (Tl-1212) caused an initial increase in the zero-resistance-temperature (T c zero). The sample where x=0.20 showed the highest T c onset and Tc zero. The XRD patterns indicated that this sample was only Tl-1212 phase. The excess conductivity analyses showed that Re substitution induced 2D-to-3D conductivity transitions at the highest transition temperature (T2D-3D) observed at x=0.15. The calculations based on the Lawrence-Doniach model revealed that the shortest coherence length and inter-plane coupling (J) occurred when x=0.30. Re in the Tl-1212 phase is in a mixed valence state (4+/5+) with an optimal value of 4.5+.

KW - Aslamazov-Larkin theory

KW - Lawrence-Donaich theory

KW - Re substitution

KW - Tl-1212 phase

UR - http://www.scopus.com/inward/record.url?scp=84900505899&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84900505899&partnerID=8YFLogxK

U2 - 10.1016/j.ceramint.2014.02.006

DO - 10.1016/j.ceramint.2014.02.006

M3 - Article

VL - 40

SP - 9383

EP - 9388

JO - Ceramics International

JF - Ceramics International

SN - 0272-8842

IS - 7 PART A

ER -