Universität zu Köln

Sterzi, A., Crepaldi, A., Cilento, F., Manzoni, G., Frantzeskakis, E., Zacchigna, M., van Heumen, E., Huang, Y. K., Golden, M. S. and Parmigiani, F. (2016). SmB6 electron-phonon coupling constant from time- and angle-resolved photoelectron spectroscopy. Phys. Rev. B, 94 (8). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

SmB6 is a mixed valence Kondo system resulting from the hybridization between localized f electrons and delocalized d electrons. We have investigated its out-of-equilibrium electron dynamics by means of time- and angle-resolved photoelectron spectroscopy. The transient electronic population above the Fermi level can be described by a time-dependent Fermi-Dirac distribution. By solving a two-temperature model that well reproduces the relaxation dynamics of the effective electronic temperature, we estimate the electron-phonon coupling constant lambda to range from 0.13 +/- 0.03 to 0.04 +/- 0.01. These extremes are obtained assuming a coupling of the electrons with either a phonon mode at 10 or 19 meV. A realistic value of the average phonon energy will give an actual value of lambda within this range. Our results provide an experimental report on the material electron-phonon coupling, contributing to both the electronic transport and the macroscopic thermodynamic properties of SmB6.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sterzi, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Crepaldi, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cilento, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Manzoni, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Frantzeskakis, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zacchigna, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED van Heumen, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Huang, Y. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Golden, M. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Parmigiani, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-266271
DOI:	10.1103/PhysRevB.94.081111
Journal or Publication Title:	Phys. Rev. B
Volume:	94
Number:	8
Date:	2016
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SURFACE; THERMALIZATION; DYNAMICS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26627