Defect modulated Raman response of KC(8) single crystals

Autor(en)

Julio Cesar Chacon Torres, Thomas Pichler

Abstrakt

In situ experiments of graphite intercalation with potassium have been performed under high vacuum (HV) conditions. A detailed Raman lineshape analysis of the G-line was applied to determine the intrinsic response of the stage one KC(8) compound. Four defect-modulated graphite single crystals were analyzed. We observe five vibrational modes (similar to 560, 1260, 1510, 1547, and 1563 cm(-1)). From a Breit-Wigner-Fano (BWF) lineshape analysis we elucidate the contribution of each vibrational mode observed. The intensity of the z-axis mode (CZ) around similar to 560 cm(-1) varies depending on the defect modulated nominal KC(8) crystal chosen. We prove that the intrinsic G-line of KC(8) is at 1510 cm(-1), and it is strongly dependent on the actual defect content in the sample, which has important implications for the electron phonon coupling (EPC) responsible of superconductivity in this system

Organisation(en)

Elektronische Materialeigenschaften

Journal

Physica Status Solidi. B: Basic Research

Band

248

Seiten

2744-2747

Anzahl der Seiten

4

ISSN

0370-1972

DOI

https://doi.org/10.1002/pssb.201100135

Publikationsdatum

2011

Peer-reviewed

Ja

ÖFOS 2012

2020 Elektrotechnik, Elektronik, Informationstechnik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5948bddf-e0c6-4dac-a07c-0bc112b11f1a