The NQR picture of electronic phase separation in the lanthanum–barium cuprates

We report the results of Cu and La NQR investigations of the spin and charge separation in La 2~x Ba x CuO 4 compounds. For Ba doping x"1 inducing the low-temperature tetragonal phase our Cu}NQR measurements revealed three inequivalent Cu sites in CuO 2 planes. In terms of the stripe-phase picture we assign them to the charged stripe, to its neighborhood and to the AF correlated regions free of holes correspondingly. The last site corresponds to the ordered Cu magnetic moment of 0.29k B . ( 2000 Published by Elsevier Science B.V. All rights reserved.