The amplitudes and the structure of the charge density wave in YBCO

2016/04/06 by Kharkov, Yaroslav A., Sushkov, Oleg P.
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.1604.01499

Abstract

We find unknown s- and d-wave amplitudes of the recently discovered charge density wave (CDW) in underdoped cuprates. To do so we perform a combined analysis of experimental data for ortho-II YBa₂Cu₃O_y. The analysis includes data on nuclear magnetic resonance, resonant inelastic X-ray scattering, and hard X-ray diffraction. The amplitude of doping modulation found in our analysis is 3.5⋅ 10^-3 in a low magnetic field and T=60K, the amplitude is 6.5⋅ 10^-3 in a magnetic field of 30T and T=1.3K. The values are in units of elementary charge per unit cell of a CuO₂ plane. We show that the data rule out a checkerboard pattern, and we also show that the data might rule out mechanisms of the CDW which do not include phonons.

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