Infrared Optical Response of PdCoO2 thin film

ORAL

Abstract

Optical properties of delafossite PdCoO2 thin film on Al2O3 have been obtained by reflectance, transmittance and ellipsometry measurements in frequency range from 60 cm-1 to 32000 cm-1. The ab-plane Drude electron exhibits frequency-dependent effective mass and the scattering rate, which indicates coupling of the carrier with a boson mode locate at Ω = 760 cm-1. We show that, through additional polarization-dependent measurements on PdCoO2 single crystal, a longitudinal optical (LO) phonon of c-axis corresponds to the boson mode. The coupling of ab-electron with c-axis LO phonon provides a new insight on the electrodynamics of layered metal oxide system.

*MOLIT as [Innovative Talent Education Program for Smart City

–

Publication: [1] M. Brahlek, G. Rimal, J. M. Ok, D. Mukherjee, A. R.
Mazza, Q. Lu, H. N. Lee, T. Z. Ward, R. R. Unocic,
G. Eres, et al., Growth of metallic delafossite pdco o 2
by molecular beam epitaxy, Physical Review Materials 3,
093401 (2019).
[2] C. Homes, S. Khim, and A. P. Mackenzie, Perfect sepa-
ration of intraband and interband excitations in pdcoo 2,
Physical Review B 99, 195127 (2019).
[3] J. Carbotte, Properties of boson-exchange superconduc-
tors, Reviews of Modern Physics 62, 1027 (1990).
[4] P. Allen, Electron-phonon effects in the infrared properties
of metals, Physical Review B 3, 305 (1971).
[5] S. Shulga, O. Dolgov, and E. Maksimov, Electronic states
and optical spectra of htsc with electron-phonon coupling,
Physica C: Superconductivity 178, 266 (1991).
[6] D. Stricker, J. Mravlje, C. Berthod, R. Fittipaldi, A. Vec-
chione, A. Georges, and D. Van Der Marel, Optical re-
sponse of sr 2 ruo 4 reveals universal fermi-liquid scaling
and quasiparticles beyond landau theory, Physical review
letters 113, 087404 (2014).
[7] P. Kostic, Y. Okada, N. Collins, Z. Schlesinger, J. Reiner,
L. Klein, A. Kapitulnik, T. Geballe, and M. Beasley, Non-
fermi-liquid behavior of srruo 3: evidence from infrared
conductivity, Physical Review Letters 81, 2498 (1998).
[8] Z. Schlesinger, R. Collins, F. Holtzberg, C. Feild, S. Blan-
ton, U. Welp, G. Crabtree, Y. Fang, and J. Liu, Super-
conducting energy gap and normal-state conductivity of
a single-domain yba 2 cu 3 o 7 crystal, Physical review
letters 65, 801 (1990).

Presenters

  • Dongmin Seo

    • University of Seoul

Authors

  • Dongmin Seo

    • University of Seoul

  • Eunjip Choi

    • University of Seoul
    • Univ of Seoul

  • soonjae moon

    • Hanyang University

  • Gihyeon Ahn

    • Hanyang Univ

  • Seongshik Oh

    • Rutgers University

  • Gaurab Rimal

    • Rutgers University

  • Seunghyun Khim

    • Max Planck Institute for Chemical Physics of Solids