Similar glassy features in the NMR response of pure and disordered La1.88Sr0.12CuO4

Details Similar glassy features in the NMR response of pure and disordered La1.88Sr0.12CuO4 Similar glassy features in the NMR response of pure and disordered La1.88Sr0.12CuO4

2008-06-02

arxiv.org/abs/0806.0207v1

Phys. Rev. B 78, 014504 (2008)

Physics

Condensed Matter

Superconductivity

7 pages, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.78.014504

High Tc superconductivity in La2-xSrxCuO4 coexists with (striped and glassy) magnetic order. Here, we report NMR measurements of the 139La spin-lattice relaxation, which displays a stretched-exponential time dependence, in both pure and disordered x=0.12 single crystals. An analysis in terms of a distribution of relaxation rates T1^-1 indicates that i) the spin-freezing temperature is spatially inhomogeneous with an onset at Tg(onset)=20 K for the pristine samples, and ii) the width of the T1^-1 distribution in the vicinity of Tg(onset) is insensitive to an ~1% level of atomic disorder in CuO2 planes. This suggests that the stretched-exponential 139La relaxation, considered as a manifestation of the systems glassiness, may not arise from quenched disorder.

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