Spin dynamics and ordering of a cuprate stripe-antiferromagnet

Details Spin dynamics and ordering of a cuprate stripe-antiferromagnet Spin dynamics and ordering of a cuprate stripe-antiferromagnet

2000-07-04

arxiv.org/abs/cond-mat/0007057v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages including 3 figures - ref. 16 added

Scientific paper

10.1103/PhysRevB.63.020507

In La1.48Nd0.4Sr0.12CuO4 the 139La and 63Cu NQR relaxation rates and signal wipe-out upon lowering temperature are shown to be due to purely magnetic fluctuations. They follow the same renormalized classical behavior as seen in neutron data, when the electronic spins order in stripes, with a small spread in spin stiffness (15% spread in activation energy). The La signal, which reappears at low temperatures, is magnetically broadened and experiences additional wipe-out due to slowing down of the Nd fluctuations.

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