4.6 Article

Systematic Raman study of optical phonons in RBa2Cu3O6+δ (R = Y, Dy, Gd, Sm, Nd): Antiferromagnetic coupling strength versus lattice parameters

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PHYSICAL REVIEW B
卷 99, 期 9, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.094525

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  1. Deutsche Forschungsgemeinschaft DFG [LE967/16-1]
  2. QUANOMET initiative [LENA-NL4-1]
  3. German-Israeli Foundation for Scientic Research and Development (GIF)
  4. Rutherford Foundation of New Zealand

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We present a systematic study of the interplay between lattice parameters and the energy of the optical phonons as well as the antiferromagnetic coupling strength, J, in the high-T-c superconducting cuprate RBa2Cu3O6+delta (R-123, R = Y, Dy, Gd, Sm, Nd) with hole doping p (0.00 < p less than or similar to 0.04). The energy of the B-1g mode at V-B1g approximate to 335 cm(-1) has been found to relate systematically to the inverse of the lattice parameter a. Our results confirm the temperature dependent phonon splitting for Nd-123 at low doping, which has been reported for optimally doped Nd-123. Surprisingly, J is independent of a for the first four R families, and a general consistency between T-c(max) and J, as suggested in a previous investigation, could not be confirmed.

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