Publication

Spectroscopic Signatures Of Phase-Transitions In A Charge-Density-Wave System - 1T-Tas2

Marco Grioni
1992
Journal Articles

Abstract

Photoelectron spectroscopy with high-energy resolution has been utilized to investigate the charge-density wave (CDW) in 1T-TaS2 between 20 and 360 K. Constant binding-energy curves reveal discontinuities in the temperature dependence of the photoelectron spectral function rho(E), and demonstrate that sudden modifications of the electronic structure, namely, in the vicinity of the Fermi level E(F), mark the first-order CDW transitions. In the commensurate phase, below 180 K, rho(E(F)) reflects the formation of a correlation pseudogap. On disordered surfaces, however, the long-range coherence typical of the commensurate phase is lost, and a normal metallic behavior is recovered.

Official source

https://infoscience.epfl.ch/entities/publication/55c86e30-75f7-46f2-8341-c3418f192ba0

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Marco Grioni
1992
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/55c86e30-75f7-46f2-8341-c3418f192ba0

About this result

Related concepts (32)

Phase transition

In chemistry, thermodynamics, and other related fields, a phase transition (or phase change) is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas, and in rare cases, plasma. A phase of a thermodynamic system and the states of matter have uniform physical properties. During a phase transition of a given medium, certain properties of the medium change as a result of the change of external conditions, such as temperature or pressure.

X-ray photoelectron spectroscopy

X-ray photoelectron spectroscopy (XPS) is a surface-sensitive quantitative spectroscopic technique based on the photoelectric effect that can identify the elements that exist within a material (elemental composition) or are covering its surface, as well as their chemical state, and the overall electronic structure and density of the electronic states in the material. XPS is a powerful measurement technique because it not only shows what elements are present, but also what other elements they are bonded to.

Phase (matter)

In the physical sciences, a phase is a region of material that is chemically uniform, physically distinct, and (often) mechanically separable. In a system consisting of ice and water in a glass jar, the ice cubes are one phase, the water is a second phase, and the humid air is a third phase over the ice and water. The glass of the jar is another separate phase. (See .) More precisely, a phase is a region of space (a thermodynamic system), throughout which all physical properties of a material are essentially uniform.

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Spectroscopic Signatures Of Phase-Transitions In A Charge-Density-Wave System - 1T-Tas2

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