Evidence for Antiferromagnetic Order in La${}_{2-x}$Ce${}_x$CuO${}_4$ from Angular Magnetoresistance Measurements

Abstract

We investigated the in-plane angular magnetoresistivity (AMR) of -phase La${}_{2-x}$Ce${}_x$CuO${}_4$ (LCCO) thin films () fabricated by a pulsed laser deposition technique. The in-plane AMR with $\mathbf{H}\parallel ab$ shows a twofold symmetry instead of the fourfold behavior found in other electron-doped cuprates such as PrCe${}_x$CuO${}_4$ and Nd${}_{2-x}$Ce${}_x$CuO${}_4$. The twofold AMR disappears above a certain temperature, $T_D$. The $T_D(x)$ is well above $T_c(x)$ for $x=0.06$ ($\sim 110$ K), and decreases with increasing doping, until it is no longer observed above $T_c(x)$ at $x=0.15$. This twofold AMR below $T_D(x)$ is suggested to originate from an antiferromagnetic or spin density wave order.

to be published in Phys. Rev. B, Vol. 80 (2009)

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