Publications (4)0 Total impact
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ABSTRACT: The superconducting transition temperature $T_{c}$ of multilayers of
electron-doped cuprates, composed of underdoped (or undoped) and overdoped La%
$_{2-x}$Ce$_{x}$CuO$_{4}$ (LCCO) and Pr$_{2-x}$Ce$_{x}$CuO$_{4}$ (PCCO) thin
films, is found to increase significantly with respect to the $T_{c}$ of the
corresponding single-phase films. By investigating the critical current density
of superlattices with different doping levels and layer thicknesses, we find
that the $T_{c}$ enhancement is caused by a redistribution of charge over an
anomalously large distance.
02/2011;
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ABSTRACT: We investigated the in-plane angular magnetoresistivity (AMR) of $% T^{^{\prime}}$-phase La$_{2-x}$Ce$_{x}$CuO$_{4}$ (LCCO) thin films ($% x=0.06-0.15$) 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 Pr$% _{2-x}$Ce$_{x}$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. Comment: to be published in Phys. Rev. B, Vol. 80 (2009)
06/2009;
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ABSTRACT: We investigated the in-plane angular magnetoresistance (AMR) of T′-phase La2−xCexCuO4 thin films (x=0.06–0.15) fabricated by a pulsed laser deposition technique. The in-plane AMR with H∥ab shows a twofold symmetry instead of the fourfold behavior found in other electron-doped cuprates such as Pr2−xCexCuO4 and Nd2−xCexCuO4. The twofold AMR disappears above a certain temperature, TD. The TD(x) is well above Tc(x) for x=0.06 (∼110 K), and decreases with increasing doping until it is no longer observed above Tc(x) at x=0.15. This twofold AMR below TD(x) is suggested to originate from an antiferromagnetic or spin-density-wave order.
Phys. Rev. B. 80(1).
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ABSTRACT: The superconducting transition temperature Tc of multilayers of electron-doped cuprates, composed of underdoped (or undoped) and overdoped La2-xCexCuO4 (LCCO) and Pr2-xCexCuO4 (PCCO) thin films, is found to increase significantly with respect to the Tc of the corresponding single-phase films. By investigating the critical current density of superlattices with different doping levels and layer thicknesses, we find that the Tc enhancement is caused by a redistribution of charge over an anomalously large distance.
Phys. Rev. B. 83(6).
Institutions
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2011
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University of Maryland, College Park
College Park,
MD,
USA
