Infrared Optical Response of PdCoO<sub>2</sub> 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.

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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