Structural Anomalies of Bi-2223 Phase in the Temperature Range of 8-305 K

Dong, C.; Wu, Fei; Hong, Chang Seop; Che, G.C.; Li, Jingwei; Fan, Yongxin; Zhao, Zhongxian

doi:10.1088/0256-307x/11/8/009

Chinese Phys. Lett.

1994

DOI: 10.1088/0256-307x/11/8/009

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Structural Anomalies of Bi-2223 Phase in the Temperature Range of 8-305 K

C. Dong

Fei Wu

Chang Seop Hong

et al.

Abstract: A nearly single-phased Bi-2223 sample with T, 108K was studied by low-temperature powder x-ray diffraction. Several discontinuous changes of lattice parameters are observed around 245, 160, 125, 100 and 20K. The most pronounced anomalies occur close to the superconducting transition temperature. Our observation indicates that electron-lattice interaction is quite strong near T,.

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Superconductivity Mechanism Controlled by Electric Dipole Correlation and Charge Correlation

Guerfi

2010

J Supercond Nov Magn

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The model is based on parity and time broken symmetries phase transition leading to a particle antiparticle condensation. This approach gives a unified description of low and high T c superconductivity with a point of view differing from that of BCS theory. It is argued that high-temperature superconductors transform to an anti-ferroelectric state (long range order) prior to the onset of superconductivity, whereas in conventional materials, the material's crystal structure symmetry is the key to understand the mechanism of pairing by introducing a mirror plane polarization effect in the lattice. This effect is responsible for strong coupling and of two dimensionality aspect of HTSC, as it is described below.

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Superconductivity Mechanism Controlled by Electric Dipole Correlation and Charge Correlation

Guerfi

2010

J Supercond Nov Magn

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Out-of-plane ionicity versus in-plane covalency interplay in high-T _c cuprates

Guerfi

2017

Acta Crystallogr Sect B

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It may be argued that the remarkable properties of the high-temperature superconducting cuprates such as the insulator-metal transition (IMT) and the metal-superconductor transition (MST) originate from competition and interplay between the interlayer ionic interaction and the intralayer covalent bonds in these materials. It is proposed here that the microscopic order parameter is the local field estimated from the ionic polarization at the sub-unit cell level, and it is demonstrated that it shows a strong temperature as well as chemical doping dependence. The out-of-plane ionicity induces an interlayer electron transfer that reduces the ionicity of the layers and leads to IMT, while the in-plane covalency induces in-plane intersite hole transfer that increases the out-of-plane ionicity. It is suggested that this competition leads to a local field catastrophe at a critical temperature T c that drives the compound to MST. The asymmetry of the free charge carrier density breaks locally the mirror reflection symmetry of the order parameter, leading to a pairing between the real current and the polarization current.

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Structural Anomalies of Bi-2223 Phase in the Temperature Range of 8-305 K

Cited by 2 publications

References 9 publications

Superconductivity Mechanism Controlled by Electric Dipole Correlation and Charge Correlation

Superconductivity Mechanism Controlled by Electric Dipole Correlation and Charge Correlation

Out-of-plane ionicity versus in-plane covalency interplay in high-T _c cuprates

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Product

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Structural Anomalies of Bi-2223 Phase in the Temperature Range of 8-305 K

Cited by 2 publications

References 9 publications

Superconductivity Mechanism Controlled by Electric Dipole Correlation and Charge Correlation

Superconductivity Mechanism Controlled by Electric Dipole Correlation and Charge Correlation

Out-of-plane ionicity versus in-plane covalency interplay in high-T c cuprates

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Product

Resources

About

Out-of-plane ionicity versus in-plane covalency interplay in high-T _c cuprates