Glassy Spin Freezing and NMR Wipeout Effect in the High-T_c Superconductor La1.90Sr0.10CuO4: What is the Relationship With Stripes ?

Abstract

We report on 139La and 63Ccu NMR/NQR measurements in the high-Tc superconductor La1.90Sr0.10CuO4 with Tc=26.5 K. Spin fluctuations probed by 139La spin-lattice relaxation (T1), continuously slow down on cooling through Tc. We argue that spin-freezing and superconductivity are bulk effects in this sample. Thus, both phenomena have to coexist microscopically. The distribution of 139La T1 values at low temperature reveals a wide spread of spin fluctuation frequencies in CuO2 planes. A simple estimate shows that Cu nuclei at sites where electronic fluctuations are the slowest are not observable because of too short relaxation times (wipeout effect). This means that the Cu NQR wipeout, observed in this sample, can be explained primarily by slow magnetic, rather than charge, fluctuations. This result does not rule out the connection between wipeout effect and charge stripe order [Hunt et al., Phys. Rev. Lett. 82, 4300 (1999)], but it indicates that the relationship between both phenomena is not straightforward. We argue that the wipeout fraction cannot define a proper order parameter for a stripe phase, and cannot be used alone as a criterion for its existence.

12 pages, 10 figures

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