https://doi.org/10.1140/epjst/e2010-01299-6
Regular Article
Charge order and low frequency spin dynamics in lanthanum cuprates revealed by Nuclear Magnetic Resonance
1 IFW Dresden, Institute for Solid State Research, PO Box 270116, 01171 Dresden, Germany
2 Department of Physics, University of California, Davis, CA 95616, USA
3 Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan
4 Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973-5000, USA
5 Kazan Zavoiskiy Physical-Technical Institute, Kazan, Russia
a Present address: Leibniz-Institute of Polymer Research Dresden, Hohe Str. 6, 01069 Dresden, Germany
Received:
14
July
2010
Revised:
12
August
2010
Published online:
11
October
2010
We report detailed 17O, 139La, and 63,65Cu Nuclear Magnetic Resonance (NMR) and Nuclear Quadrupole Resonance (NQR) measurements in a stripe ordered La1.875Ba0.125CuO4 single crystal and in oriented powder samples of La1.8−xEu0.2SrxCuO4. We observe a partial wipeout of the 17O NMR intensity and a simultaneous drop of the 17O electric field gradient (EFG) at low temperatures where the spin stripe order sets in. In contrast, the 63,65Cu intensity is completely wiped out at the same temperature. The drop of the 17O quadrupole frequency is compatible with a charge stripe order. The 17O spin lattice relaxation rate shows a peak similar to that of the 139La, which is of magnetic origin. This peak is doping dependent and is maximal at x ≈ 1/8.
© EDP Sciences, Springer-Verlag, 2010