Universität zu Köln

Shportko, K., Zalden, P., Lindenberg, A. M., Rueckamp, R. and Grueninger, M. (2018). Anharmonicity of the vibrational modes of phase-change materials: A far-infrared, terahertz, and Raman study. Vib. Spectrosc., 95. S. 51 - 57. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1873-3697

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Abstract

Phase-change materials are employed as active elements in optical and electronic memory devices. Upon crystallization, their visible and near-infrared dielectric properties change dramatically due to the formation of resonant bonds, a unique type of bond related to both metallic and covalent bonds. In this work we study the change of the anharmonicity upon crystallization as well as the impact of vacancy concentration and vacancy ordering on the anharmonicity, Our temperature-dependent study of vibrational modes directly reveals a correlation between anharmonicity, vacancy concentration, and ordering. Previously, such a correlation was derived only indirectly from measurements of the specific heat. The pronounced far-infrared contrast, even larger than the optical one, can enable the application of phase-change materials in photonic devices. (C) 2018 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Shportko, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zalden, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lindenberg, A. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rueckamp, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grueninger, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-194199
DOI:	10.1016/j.vibspec.2018.01.005
Journal or Publication Title:	Vib. Spectrosc.
Volume:	95
Page Range:	S. 51 - 57
Date:	2018
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1873-3697
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TEMPERATURE-DEPENDENCE; LOCAL-STRUCTURE; CRYSTALLINE; SCATTERING; GE; DISORDER Multiple languages Chemistry, Analytical; Chemistry, Physical; Spectroscopy Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19419