Europhys. Lett.
Volume 70, Number 2, April 2005
Page(s) 232 - 236
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 30 March 2005
Europhys. Lett., 70 (2), pp. 232-236 (2005)
DOI: 10.1209/epl/i2003-10316-7

Possible stripe fluctuations in $\chem{La}$2-x-y$\chem{Nd}$y$\chem{Sr}$x $\chem{CuO_4}$ at room temperature observed by $\chem{{}^{63}Cu}$ NQR spectroscopy

Q.-M. Zhang, X. N. Ying, M. Gu and Y. N. Wang

National Laboratory of Solid State Microstructures, Department of Physics Nanjing University - Nanjing 210093, PRC

received 3 September 2003; accepted in final form 3 March 2005
published online 30 March 2005

$\chem{{}^{63}Cu}$ nuclear quadrupole resonance (NQR) studies at room temperature were reported on six $\chem{Nd}$-doped $\chem{La}$2-x$\chem{Sr}$x $\chem{CuO_4}$ samples. The NQR spectrum for $\chem{La_{1.48}Nd_{0.4}Sr_{0.12}CuO_4}$ has a different line shape compared with those from the other samples, which is similar to the case of the insulating $\chem{La_2CuO_4}$. This may suggest that the stripe fluctuations at such a special $\chem{Nd}$ and $\chem{Sr}$ doping fall into the frequency window of $\chem{{}^{63}Cu}$ NQR. The spectra of the other five samples were analysed by pairs of $\chem{{}^{63}Cu}$ and $\chem{{}^{65}Cu}$ Gaussians at A and B sites. The full width of half-maxim (FWHM) for $\chem{{}^{63}Cu}$ at B sites is anomalously large for $\chem{La_{1.45}Nd_{0.4}Sr_{0.15}CuO_4}$, which was considered to be related to the stripe fluctuations.

74.25.Nf - Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.).
74.72.Dn - La-based cuprates.

© EDP Sciences 2005