Publication

Valence Electronic-Structure of Thallium-Compound High-Temperature Superconductors

Giorgio Margaritondo
1990
Journal Articles

Abstract

We used photoemission spectroscopy with synchrotron radiation to investigate the electronic structure of eight different thallium cuprates: pure Tl2.2Ba2CuO(y), Ce-doped Tl2.2Ba(2-x)Ce(x)CuO(y) (x = 0.1, 0.15, 0.2) and Tl2Ba2CeCu3O(y), and Zr-doped Tl2Ba(2-x)Zr(x)CuO(y) (x = 0.005, 0.05). The material are high-temperature superconductors, except one of the Tl2.2Ba2CuO(y) samples. The study included an investigation of the valence-electron density of states, and a detailed analysis of the Fermi edge at room temperature. No departures from the Fermi-liquid picture were observed.

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https://infoscience.epfl.ch/entities/publication/c5ad91d7-16a5-46da-816e-3dd25977d5dc

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Giorgio Margaritondo
1990
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c5ad91d7-16a5-46da-816e-3dd25977d5dc

About this result

Related concepts (32)

High-temperature superconductivity

High-temperature superconductors (abbreviated high-Tc or HTS) are defined as materials with critical temperature (the temperature below which the material behaves as a superconductor) above , the boiling point of liquid nitrogen. They are only "high-temperature" relative to previously known superconductors, which function at even colder temperatures, close to absolute zero. The "high temperatures" are still far below ambient (room temperature), and therefore require cooling.

Electronic band structure

In solid-state physics, the electronic band structure (or simply band structure) of a solid describes the range of energy levels that electrons may have within it, as well as the ranges of energy that they may not have (called band gaps or forbidden bands). Band theory derives these bands and band gaps by examining the allowed quantum mechanical wave functions for an electron in a large, periodic lattice of atoms or molecules.

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Unconventional superconductors are materials that display superconductivity which does not conform to conventional BCS theory or its extensions. The superconducting properties of CeCu2Si2, a type of heavy fermion material, were reported in 1979 by Frank Steglich. For a long time it was believed that CeCu2Si2 was a singlet d-wave superconductor, but since the mid 2010s, this notion has been strongly contested. In the early eighties, many more unconventional, heavy fermion superconductors were discovered, including UBe13, UPt3 and URu2Si2.

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Valence Electronic-Structure of Thallium-Compound High-Temperature Superconductors

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