LaSrGaO4 substrate gives oriented crystalline YBa2Cu3O7−y films

Abstract

As-grown YBa2Cu3O7−y (YBCO) thin films of 70 nm thickness have been prepared on LaSrGaO4(001), (100), and (110) single-crystal substrates at 700 °C using ArF laser ablation deposition. The c-axis oriented thin films with smooth surface morphology are obtained on LaSrGaO4 (001) and (100) substrates. The zero resistance temperatures (Tc) of the films on the (001) and (100) substrates are 90.0 K, and 88.1 K, respectively. On the (110) substrate, (110) YBCO planes grow epitaxially. The resistance perpendicular to the c axis in this film is 1/3 of that parallel to the c axis, showing Tc⊥=85.9 K and Tc∥=84.4 K, respectively. These results suggest that a LaSrGaO4 substrate having a low dielectric constant is an excellent substrate for the epitaxial growth and device application of high-Tc YBa2Cu3O7−y superconducting films.

Growth of NdBa2Cu3O7-δSuperconducting Thin Films on SrTiO3(100) and LaSrGaO4(100) Substrates

“…Although it is very hard to separate the (h00) peaks of the RBCO phase from those of STO(100) substrates in X-ray dIffraction patterns, those of the RBCO phase grown on LSGO(100) substrates can be clearly observed since the (100) peak of LSGO is forbidden [9][10][11][12]. Therefore the LSGO(100) substrate is very effective for confirming the growth of a-axis oriented RBCO thin fllms.…”

“…Ishimaru et al [5] fabricated Joshepson junctions reproducibly, using c-axis oriented NBCO thin films with smooth surface morphology by focused ion beam technique. Thin films [7][8][9][10][11][12] with a-or b-axis perpendicular to the substrates are (105) also desirable for the fabrication of superconducting devices based on the Josephson junction in view of the highly anisotropic coherence length of high temperature superconductors. Although growth of NBCO thin films with a-axis orientation on SrTiO3 (STO)(100) substrates was reported uniquely by Badaye et al [13], the superconducting transition temperature was not satisfactory compared with that of a-axis oriented YBCO thin films.…”

Growth Morphology and Atomic Surface Topology by Hartman-Perdok Analysis: Application to ABCO4and YBa2Cu3O7-x

“…For all compounds the {001}ABCO/(001)YBCO has been investigated, while for SrLaGaO4 [14] also (001) SLG /(100) YBCO and {110} SLG /(110) YBCO have been reported.…”

“…Several ΑΒCO4 compounds such as SrLaGaO4 (SLG) [14], CaΝdAlO 4 (CNA) [15] and 'SrLaΑ1O4 (SLA) [16] have already been used experimentally as substrates for YΒa2Cu3O7-x thin films. For all compounds the {001}ABCO/(001)YBCO has been investigated, while for SrLaGaO4 [14] also (001) SLG /(100) YBCO and {110} SLG /(110) YBCO have been reported.…”

The Controlled Synthesis of Metastable Oxides Utilizing Epitaxy and Epitaxial Stabilization

“…as well as spawning a number of new perovskite and perovskite-related substrates. [270][271][272][273] ; many are produced with structural perfection rivaling that of conventional semiconductors. The pseudotetragonal or pseudocubic a-axis lattice spacings offered by these commercial substrates, together with the corresponding lattice spacings of several functional oxides with perovskite and perovskite-related structures, are shown in Fig.…”