Critical Behaviour in the Spin Fluctuations and Superfluid Density of La$_{2-x}$Sr$_x$CuO$_4$

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dc.creatorPanagopoulos, C.
dc.creatorRainford, B. D.
dc.creatorCooper, J. R.
dc.creatorScott, C. A.
dc.creatorXiang, T.
dc.date2000-07-10
dc.date2001-03-09
dc.date.accessioned2026-07-07T02:38:10Z
dc.date.available2026-07-07T02:38:10Z
dc.descriptionWe study the doping dependence of low frequency spin fluctuations and the zero-temperature superfluid density of La$_{2-x}$Sr$_x$CuO$_4$ using the muon spin relaxation ($μ$SR) and ac-susceptibility techniques. Superconductivity is found to coexist with low frequency spin fluctuations over a large region of the superconducting phase diagram. The characteristic temperature of spin fluctuations detected by $μ$SR decreases with increasing $x$ and vanishes above a critical doping $x_c\sim 0.19$. This value of $x_c$ coincides with the doping at which the normal state pseudogap extrapolates to zero. The superfluid density behaves in the opposite way to the low frequency spin fluctuations. It increases with $x$ and becomes nearly doping-independent for $x>x_c$. These results are consistent with predictions involving quantum criticality at $x_c$.
dc.description4 pages, 3 figures, minor corrections and references added
dc.identifierhttps://arxiv.org/abs/cond-mat/0007158
dc.identifierhttp://arxiv.org/abs/cond-mat/0007158
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/16569
dc.subjectSuperconductivity
dc.titleCritical Behaviour in the Spin Fluctuations and Superfluid Density of La$_{2-x}$Sr$_x$CuO$_4$
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