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首页> 外文期刊>Chinese science bulletin >Pulsed laser deposition of single-oriented superconducting Ba_(1-x)K_xBiO_3 thin films
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Pulsed laser deposition of single-oriented superconducting Ba_(1-x)K_xBiO_3 thin films

机译：单向超导Ba_（1-x）K_xBiO_3薄膜的脉冲激光沉积

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The development of superconductor/insulator/superconductor (SIS) tunnel junctions in the cupiate high-temperature superconductor family has been hampered by an anisotropic structure and a coherence length ￡ as short as 0.3 nm. However, the discoveryof Ba_(1-x)K_x-BiO_3 (x≈0.4) superconductor which is an isotropic cubic structure and has a moderately long coherence length zeta (≈5 nm), has provided not only another opportunity to examine the pairing mechanism in perovskite superconductors but alsogiven us a possibility of fabricating SIS tunnel, junctions of high quality, Fink et al. have prepared hysteretic Josephson junctions from YBCO/SrTiO_3/BKBO trilayer films, and observed Shapiro steps and self-induced steps. BKBO/I/BKBO sandwitch-type junctions have also been reported, among which the insulator layers are BaBi_2O_y, SrTiO_3, KNbO_3, MgO, etc, Gap structure was seen commonly, some having low leakage current. Recently, BKBO thin films have been deposited using various techniques includingmolecular beam epitaxy (MBE) by rf magnetron sputtering and by pulsed laser deposition (PLD). We prepared single-oriented superconducting BKBO thin films on LaALO_3 (100) substrates by PLD technique, and discussed the influences of substrate temperature in the deposition process.
机译：铜质高温超导体家族中超导体/绝缘体/超导体（SIS）隧道结的发展受到各向异性结构和相干长度￡短至0.3 nm的阻碍。然而，Ba_（1-x）K_x-BiO_3（x≈0.4）超导体的发现是各向同性的立方结构，具有适度的相干长度zeta（≈5nm），不仅提供了另一种检验配对机理的机会Fink等人在钙钛矿超导体中的应用，也使我们有可能制造SIS隧道，高质量的结。已经从YBCO / SrTiO_3 / BKBO三层薄膜制备了滞后的约瑟夫森结，并观察了Shapiro步骤和自诱导步骤。还报道了BKBO / I / BKBO沙漏型结，其中绝缘层为BaBi_2O_y，SrTiO_3，KNbO_3，MgO等，普遍可见间隙结构，其中一些具有低漏电流。最近，已经通过包括射频磁控溅射和脉冲激光沉积（PLD）在内的各种技术包括分子束外延（MBE）来沉积BKBO薄膜。我们通过PLD技术在LaALO_3（100）衬底上制备了单取向超导BKBO薄膜，并讨论了衬底温度对沉积过程的影响。

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