New collective mode in YBa${}_{2}$Cu${}_{3}$O${}_{6+x}$ observed by time-domain reflectometry

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New collective mode in YBa $_{2}$ Cu $_{3}$ O $_{6 + x}$ observed by time-domain reflectometry

J. P. Hinton, J. D. Koralek, Y. M. Lu, A. Vishwanath, J. Orenstein, D. A. Bonn, W. N. Hardy, and Ruixing Liang

Phys. Rev. B 88, 060508(R) – Published 26 August 2013

Abstract

We report the observation of coherent oscillations associated with charge-density-wave (CDW) order in the underdoped cuprate superconductor YBa $_{2}$ Cu $_{3}$ O $_{6 + x}$ by time-resolved optical reflectivity. Oscillations with frequency $1.87$ THz onset at approximately 105 and 130 K for dopings of $x = 0.67$ (ortho-VIII) and $x = 0.75$ (ortho-III), respectively. Upon cooling below the superconducting critical temperature ( $T_{c}$ ), the oscillation amplitude is enhanced, the phase shifts by $π$ , and the frequency softens by $δ ν / ν \approx 7 %$ . A biquadratically coupled Landau-Ginzburg model qualitatively describes this behavior as arising from competition between superconducting and CDW orders.

Received 8 May 2013

DOI:https://doi.org/10.1103/PhysRevB.88.060508

Authors & Affiliations

J. P. Hinton^1,2,*, J. D. Koralek¹, Y. M. Lu^1,2, A. Vishwanath^1,2, J. Orenstein^1,2, D. A. Bonn^3,4, W. N. Hardy^3,4, and Ruixing Liang^3,4

¹Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
²Department of Physics, University of California, Berkeley, Berkeley, California 94720, USA
³Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V62 1Z4, Canada
⁴Canadian Institute for Advanced Resarch, Toronto, ON M5G 178, Canada

^*jhinton@berkeley.edu

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Vol. 88, Iss. 6 — 1 August 2013

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