High-pressure infrared spectroscopy: Tuning of the low-energy excitations in correlated electron systems

I. Kézsmárki, R. Gaál, C. C. Homes, B. Sípos, H. Berger, S. Bordács, G. Mihály, L. Forró

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have extended the range of the high-pressure optical spectroscopy to the far-infrared region keeping the accuracy of ambient-pressure experiments. The developed method offers a powerful tool for the study of pressure-induced phase transitions and electronic-structural changes in correlated electron systems as the optical pressure cell, equipped with large free-aperture diamond window, allows the measurement of optical reflectivity down to ω≈20-30 cm-1 for hydrostatic pressures up to p≈26 kbar. The efficiency of the technique is demonstrated by the investigation of the two-dimensional charge-density-wave 1T-Ta S2 whose electronic structure shows high sensitivity to external pressure. The room-temperature semimetallic phase of 1T-Ta S2 is effectively extended by application of pressure and stabilized as the ground state above p=14 kbar. The corresponding fully incoherent low-energy optical conductivity is almost temperature independent below T=300 K. For intermediate pressures, the onset of the low-temperature insulating phase is reflected by the sudden drop of the reflectivity and by the emergence of sharp phonon resonances.

Original languageEnglish
Article number205114
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number20
DOIs
Publication statusPublished - Nov 21 2007

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Excitation energy
Infrared spectroscopy
Tuning
infrared spectroscopy
tuning
Electrons
excitation
electrons
energy
reflectance
Optical conductivity
Charge density waves
Diamond
hydrostatic pressure
Hydrostatic pressure
Temperature
Ground state
Electronic structure
apertures
diamonds

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

High-pressure infrared spectroscopy : Tuning of the low-energy excitations in correlated electron systems. / Kézsmárki, I.; Gaál, R.; Homes, C. C.; Sípos, B.; Berger, H.; Bordács, S.; Mihály, G.; Forró, L.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 76, No. 20, 205114, 21.11.2007.

Research output: Contribution to journalArticle

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