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In-plane charge modulation below T(c) and charge-density-wave correlations in the chain layer in YBa2Cu3O7
1Laboratoire de Spectrometrie Physique, Universite J. Fourier, BP 87, 38402 Saint Martin d'Heres, France.
Physical Review Letters
|September 16, 2000
Summary
Nuclear quadrupole resonance (NQR) measurements reveal a charge-density-wave state in YBa2Cu3O7 chains. This state strongly influences the in-plane charge modulation below the superconducting transition temperature.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- YBa2Cu3O7 is a high-temperature superconductor with complex electronic properties.
- Understanding charge dynamics is crucial for elucidating superconductivity mechanisms.
Purpose of the Study:
- To investigate the electronic states and charge ordering in YBa2Cu3O7 using NQR.
- To explore the relationship between chain and plane charge modulations and superconductivity.
Main Methods:
- Nuclear quadrupole resonance (NQR) spectroscopy was employed.
- Measurements were conducted on Cu(1) chain and Cu(2) plane sites in YBa2Cu3O7.
- Temperature dependence studies were performed from 300 K down to 4.2 K.
Main Results:
- A sharp increase in Cu(1) NQR linewidth and specific temperature dependence of spin-lattice relaxation rate confirm a charge-density-wave (CDW) state in the chains.
- Broadening of the Cu(2) linewidth below the superconducting transition temperature (T(c)) was observed.
- Anomalous temperature dependence of NQR parameters for both Cu(1) and Cu(2) sites suggests coupling between chain and plane charge modulations.
Conclusions:
- The study confirms the existence of a CDW state in the Cu(1) chains of YBa2Cu3O7.
- In-chain CDW correlations are strongly implicated in the formation of an in-plane charge modulated structure below T(c).
- These findings provide insights into the interplay between charge ordering and superconductivity in cuprates.
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