期刊
PHYSICAL REVIEW B
卷 88, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.060508
关键词
-
资金
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, the US Department of Energy [DE-AC02-05CH11231]
We report the observation of coherent oscillations associated with charge-density-wave (CDW) order in the underdoped cuprate superconductor YBa2Cu3O6+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 pi, and the frequency softens by delta nu/nu approximate to 7%. A biquadratically coupled Landau-Ginzburg model qualitatively describes this behavior as arising from competition between superconducting and CDW orders.
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