Zn-induced spin dynamics in overdoped La${}_{2-x}$Sr${}_x$Cu${}_{1-y}$Zn${}_y$O${}_4$

Abstract

Spin fluctuations and the local spin susceptibility in isovalently Zn-substituted La${}_{2-x}$Sr${}_x$Cu${}_{1-y}$Zn${}_y$O${}_4$ ($x=0.25$, $y\approx 0.01$) are measured via inelastic neutron scattering techniques. As Zn${}^{2+}$ is substituted onto the Cu${}^{2+}$-sites, an anomalous enhancement of the local spin susceptibility ${\chi }^{\prime \prime }(\omega )$ appears due to the emergence of a commensurate antiferromagnetic excitation centered at wave vector \textbf{Q}$=(\pi ,\pi ,0)$ that coexists with the known incommensurate SDW excitations at \textbf{Q}${}_{HK}=(\pi \pm \delta ,\pi ),(\pi ,\pi \pm \delta )$. Our results support a picture of Zn-induced antiferromagnetic (AF) fluctuations appearing through a local staggered polarization of Cu${}^{2+}$-spins, and the simultaneous suppression of T${}_c$ as AF fluctuations are slowed in proximity to Zn-impurities suggests the continued importance of high energy AF fluctuations at the far overdoped edge of superconductivity in the cuprates.

10 pages, 8 figures

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Cited by in corpus (1)

• Curie-like paramagnetism due to incomplete Zhang-Rice singlet formation in La2-xSrxCuO4