Anharmonicity of the vibrational modes of phase-change materials: A far-infrared, terahertz, and Raman study

Shportko, Konstantin; Zalden, P.; Lindenberg, A. M.; Ruckamp, R.; Gruninger, M.

doi:10.1016/j.vibspec.2018.01.005

Title: Anharmonicity of the vibrational modes of phase-change materials: A far-infrared, terahertz, and Raman study

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. Furthermore, the pronounced far-infrared contrast, even larger than the optical one, can enable the application of phase-change materials in photonic devices.

Authors:

Shportko, Konstantin ^[1]; Zalden, P. ^[2]; Lindenberg, A. M. ^[3]; Ruckamp, R. ^[4]; Gruninger, M. ^[4]

National Academy of Sciences of Ukraine, Kyiv (Ukraine); RWTH Aachen Univ., Aachen (Germany)
SLAC National Accelerator Lab., Menlo Park, CA (United States); European XFEL GmbH, Schenefeld (Germany)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
Univ. of Cologne, Cologne (Germany)

Publication Date:: Wed Jan 31 00:00:00 EST 2018

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1461623

Grant/Contract Number:: AC02-76SF00515

Resource Type:: Accepted Manuscript

Journal Name:: Vibrational Spectroscopy

Additional Journal Information:: Journal Volume: 95; Journal Issue: C; Journal ID: ISSN 0924-2031

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Phonons; Anharmonicity; IR; Raman; THz; Phase-change materials

Citation Formats


                    Shportko, Konstantin, Zalden, P., Lindenberg, A. M., Ruckamp, R., and Gruninger, M. Anharmonicity of the vibrational modes of phase-change materials: A far-infrared, terahertz, and Raman study.  United States: N. p., 2018. 
Web.  doi:10.1016/j.vibspec.2018.01.005.

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                    Shportko, Konstantin, Zalden, P., Lindenberg, A. M., Ruckamp, R., & Gruninger, M. Anharmonicity of the vibrational modes of phase-change materials: A far-infrared, terahertz, and Raman study.  United States.  https://doi.org/10.1016/j.vibspec.2018.01.005

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                    Shportko, Konstantin, Zalden, P., Lindenberg, A. M., Ruckamp, R., and Gruninger, M. Wed .  
"Anharmonicity of the vibrational modes of phase-change materials: A far-infrared, terahertz, and Raman study".  United States.  https://doi.org/10.1016/j.vibspec.2018.01.005.  https://www.osti.gov/servlets/purl/1461623.

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@article{osti_1461623,

  title        = {Anharmonicity of the vibrational modes of phase-change materials: A far-infrared, terahertz, and Raman study},

  author       = {Shportko, Konstantin and Zalden, P. and Lindenberg, A. M. and Ruckamp, R. and Gruninger, M.},

  abstractNote = {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. Furthermore, the pronounced far-infrared contrast, even larger than the optical one, can enable the application of phase-change materials in photonic devices.},

  doi          = {10.1016/j.vibspec.2018.01.005},

  journal      = {Vibrational Spectroscopy},

  number       = C,

  volume       = 95,

  place        = {United States},

  year         = {Wed Jan 31 00:00:00 EST 2018},

  month        = {Wed Jan 31 00:00:00 EST 2018}

}

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Cited by: 9 works

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Figures / Tables:

Fig. 1: Optical conductivity σ₁ of studied materials. The vertical dashed lines at 50 cm^-1 indicate the lower limit of our FTIR measurements. I. AgInTe₂ in the amorphous (blue) and crystalline (red) states. II–IV. The change of σ₁ between amorphous and crystalline states is much more pronounced in GST (samemore »

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