Physics – Condensed Matter – Superconductivity
Scientific paper
1999-07-22
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1209/epl/i2000-00550-y
The nuclear quadrupole resonance (NQR) spectrum of strontium doped La$_2$CuO$_4$ surprisingly resembles the NQR spectrum of La$_2$CuO$_4$ doped with excess oxygen, both spectra being dominated by a main peak and one principal satellite peak at similar frequencies. Using first-principles cluster calculations this is investigated here by calculating the electric field gradient (EFG) at the central copper site of the cluster after replacing a lanthanum atom in the cluster with a strontium atom or adding an interstitial oxygen to the cluster. In each case the EFG was increased by approximately 10 % leading unexpectedly to the explanation that the NQR spectra are only accidentally similar and the origins are quite different. Additionally the widths of the peaks in the NQR spectra are explained by the different EFG of copper centres remote from the impurity. A model, based on holes moving rapidly across the planar oxygen atoms, is proposed to explain the observed increase in frequency of both the main and satellite peaks in the NQR spectrum as the doping concentration is increased.
Meier P. F.
Pliberšek S.
No associations
LandOfFree
Interpretation of Nuclear Quadrupole Resonance Spectra in Doped La$_2$CuO$_4$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Interpretation of Nuclear Quadrupole Resonance Spectra in Doped La$_2$CuO$_4$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interpretation of Nuclear Quadrupole Resonance Spectra in Doped La$_2$CuO$_4$ will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-286222