Structural phase control of (La$_{1.48}$Nd$_{0.40}$Sr$_{0.12}$)CuO$_4$ thin films by epitaxial growth technique

I. Tsukada

doi:10.1103/PhysRevB.64.224501

paper

Structural phase control of (La $_{1.48}$ Nd $_{0.40}$ Sr $_{0.12}$ )CuO $_{4}$ thin films by epitaxial growth technique

arXiv:cond-mat/0109069 · doi:10.1103/PhysRevB.64.224501

Abstract

Epitaxial growth of (La $_{1.48}$ Nd $_{0.40}$ Sr $_{0.12}$ )CuO $_{4}$ thin films was studied by pulsed-laser deposition technique on three different substrates, SrTiO $_{3}$ (100), LaSrAlO $_{4}$ (001), and YAlO $_{3}$ (001). The (Nd,Sr,Ce) $_{2}$ CuO $_{4}$ -type structure appears at the initial growth stage on SrTiO $_{3}$ (100) when the film is deposited under the growth conditions optimized for (La,Sr) $_{2}$ CuO $_{4}$ . This (Nd,Sr,Ce) $_{2}$ CuO $_{4}$ -type structure can be eliminated by increasing the substrate temperature and the laser repetition frequency. Films on LaSrAlO $_{4}$ (001) maintain a La $_{2}$ CuO $_{4}$ -type structure as bulk samples, but those on YAlO $_{3}$ (001) show phase separation into La $_{2}$ CuO $_{4}$ - and Nd $_{2}$ CuO $_{4}$ -type structures. Such complicated results are explained in terms of the competition between lattice misfit and thermodynamic conditions. Interestingly the films with La $_{2}$ CuO $_{4}$ -type structure prepared on SrTiO $_{3}$ and LaSrAlO $_{4}$ show different surface structures and transport properties. The results indicate the possibility of controlling charge stripes of (La $_{1.48}$ Nd $_{0.40}$ Sr $_{0.12}$ )CuO $_{4}$ as was demonstrated in (La,Ba) $_{2}$ CuO $_{4}$ thin films by Sato et al. (Phys. Rev. B {\bf 62}, R799 (2000)).

5 pages, 6 EPS figure, accepted for publication in Phys. Rev. B

Structural phase control of (La1.48​Nd0.40​Sr0.12​)CuO4​ thin films by epitaxial growth technique

Abstract

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Structural phase control of (La $_{1.48}$ Nd $_{0.40}$ Sr $_{0.12}$ )CuO $_{4}$ thin films by epitaxial growth technique