Acoustic phonons and a central mode in the protonic conductor K3 H (SeO4) 2

Fumihito Shikanai, Shinya Tsukada, Jun Kano, Seiji Kojima

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The dynamical properties of protonic conductor K3 H (SeO4) 2 were examined by Brillouin scattering. Both longitudinal-acoustic modes (c33 and c11) and a transversal mode (c44) monotonously depend on temperature, and no soft mode was observed. A central mode with a width about 6 GHz was observed above phase-transition temperature, TC. The central mode has a symmetry Eg corresponding to the rotational mode of SeO4 tetrahedra. The Eg mode is compatible with a zone-boundary soft mode, L3, which accounts for the symmetrical change from R 3̄ m to C2/c. The intensity of the central mode declines in the vicinity of TC. This shows that chaotic rotational motion changes into a zone-boundary soft mode with decreasing temperature.

Original languageEnglish
Article number012301
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number1
DOIs
Publication statusPublished - Jan 12 2010
Externally publishedYes

Fingerprint

Phonons
phonons
conductors
Acoustics
Brillouin scattering
acoustics
Superconducting transition temperature
Phase transitions
Temperature
tetrahedrons
transition temperature
temperature
symmetry

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Acoustic phonons and a central mode in the protonic conductor K3 H (SeO4) 2. / Shikanai, Fumihito; Tsukada, Shinya; Kano, Jun; Kojima, Seiji.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 1, 012301, 12.01.2010.

Research output: Contribution to journalArticle

@article{c23e0f497dca438694f8653721d24fe0,
title = "Acoustic phonons and a central mode in the protonic conductor K3 H (SeO4) 2",
abstract = "The dynamical properties of protonic conductor K3 H (SeO4) 2 were examined by Brillouin scattering. Both longitudinal-acoustic modes (c33 and c11) and a transversal mode (c44) monotonously depend on temperature, and no soft mode was observed. A central mode with a width about 6 GHz was observed above phase-transition temperature, TC. The central mode has a symmetry Eg corresponding to the rotational mode of SeO4 tetrahedra. The Eg mode is compatible with a zone-boundary soft mode, L3, which accounts for the symmetrical change from R 3̄ m to C2/c. The intensity of the central mode declines in the vicinity of TC. This shows that chaotic rotational motion changes into a zone-boundary soft mode with decreasing temperature.",
author = "Fumihito Shikanai and Shinya Tsukada and Jun Kano and Seiji Kojima",
year = "2010",
month = "1",
day = "12",
doi = "10.1103/PhysRevB.81.012301",
language = "English",
volume = "81",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "1",

}

TY - JOUR

T1 - Acoustic phonons and a central mode in the protonic conductor K3 H (SeO4) 2

AU - Shikanai, Fumihito

AU - Tsukada, Shinya

AU - Kano, Jun

AU - Kojima, Seiji

PY - 2010/1/12

Y1 - 2010/1/12

N2 - The dynamical properties of protonic conductor K3 H (SeO4) 2 were examined by Brillouin scattering. Both longitudinal-acoustic modes (c33 and c11) and a transversal mode (c44) monotonously depend on temperature, and no soft mode was observed. A central mode with a width about 6 GHz was observed above phase-transition temperature, TC. The central mode has a symmetry Eg corresponding to the rotational mode of SeO4 tetrahedra. The Eg mode is compatible with a zone-boundary soft mode, L3, which accounts for the symmetrical change from R 3̄ m to C2/c. The intensity of the central mode declines in the vicinity of TC. This shows that chaotic rotational motion changes into a zone-boundary soft mode with decreasing temperature.

AB - The dynamical properties of protonic conductor K3 H (SeO4) 2 were examined by Brillouin scattering. Both longitudinal-acoustic modes (c33 and c11) and a transversal mode (c44) monotonously depend on temperature, and no soft mode was observed. A central mode with a width about 6 GHz was observed above phase-transition temperature, TC. The central mode has a symmetry Eg corresponding to the rotational mode of SeO4 tetrahedra. The Eg mode is compatible with a zone-boundary soft mode, L3, which accounts for the symmetrical change from R 3̄ m to C2/c. The intensity of the central mode declines in the vicinity of TC. This shows that chaotic rotational motion changes into a zone-boundary soft mode with decreasing temperature.

UR - http://www.scopus.com/inward/record.url?scp=77954769889&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77954769889&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.81.012301

DO - 10.1103/PhysRevB.81.012301

M3 - Article

AN - SCOPUS:77954769889

VL - 81

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 1

M1 - 012301

ER -