Topological interpretation of the van Hove singularity: Orbital switching

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Journal of Superconductivity

DOI:https://doi.org/10.1007/BF01320873· OSTI ID:106855

Markiewicz, R S ^[1]

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1. Northeastern Univ., Boston, MA (United States)

Recent theoretical and (photoemission) experimental results greatly strengthen the case for the saddle point van Hove singularity (vHs) playing an important role in the cuprate superconductors. The vHs signals a change in the topology of the Fermi surface - usually from electronlike to holelike orbits. Thus, near the vHs, there can be tunneling between the different Fermi surface sections. This orbital switching bears some resemblance to magnetic breakdown, but is a distinct phenomenon. In the presence of finite orbit switching, the electronic orbits can form a quantum coherent network.

• Sponsoring Organization: USDOE
• OSTI ID: 106855
• Journal Information: Journal of Superconductivity, Journal Name: Journal of Superconductivity Journal Issue: 5 Vol. 7; ISSN JOUSEH; ISSN 0896-1107
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BAND THEORY
COPPER OXIDES
ELECTRON-PHONON COUPLING
HIGH-TC SUPERCONDUCTORS
PHASE TRANSFORMATIONS
SINGULARITY
VAN HOVE THEORY