The Cu NQR Study of the Stripe Phase Local Structure in the Lanthanum Cuprates

Abstract

Using Cu NQR in Eu-doped La_{2- x}Sr_xCuO_4 we show the evidence of the pinned stripe phase for moderate doping at 1.3K. The pinned fraction increases by one order of magnitude near hole doping x=1/8. The NQR lineshape reveals three inequivalent Cu positions: i) sites in the charged stripe; ii) nonmagnetic sites outside the stripes; iii) sites with a magnetic moment of 0.29 Bohr magnethon in the AF correlated regions. A dramatic change of the NQR signal for x > 0.18 correlating with the onset of bulk superconductivity corresponds to the depinning of the stripe phase. .

11 pages, 3 Postscript figures

References in corpus (1)

• Charge Segregation, Cluster Spin-Glass and Superconductivity in La1.94Sr0.06CuO4

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