Ferroelectricity and superconductivity in strained EuxSr1−xTiO3 films
Ferroelectricity and superconductivity in strained EuxSr1−xTiO3 films
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应变 EuxSr1−xTiO3 薄膜中的铁电性和超导性
DOI：
10.1103/physrevb.107.094504
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发表时间：
2023
影响因子：
3.7
通讯作者：
Stemmer, Susanne
中科院分区：
文献类型：
--
作者：
Combs, Nicholas G.;Jeong, Hanbyeol;Russell, Ryan;Kautzsch, Linus;Pardue, Tyler N.;Mates, Thomas E.;Wilson, Stephen D.;Harter, John W.;Stemmer, Susanne
超导转变可以通过调节其铁电转变来影响，但其背后的原因仍然鲜为人知。在这里，我们研究了分子束外延生长的压缩应变的Sm掺杂薄膜，以确定Eu的合金化对超导电性和铁电性的影响，这两种效应都存在于应变薄膜中。值得注意的是，超导电性最高可维持到。在本文研究的最低合金浓度下，薄膜的超导转变温度没有受到抑制，但与非合金应变薄膜相比，上临界场有很大的降低。此外，在二次谐波测量中，这些薄膜缺乏无Eu薄膜中出现的锐利的铁电相变。我们假设，Eu的合金化导致了从全局有序的铁电态到只有短程极有序的铁电态的交叉。我们讨论了全球极序的丧失与超导性质变化之间的联系。
The superconducting transition ofcan be influenced by tuning its ferroelectric transition, but the underlying reasons remain poorly understood. Here, we investigate compressively strained, Sm-doped films ofthat were grown by molecular beam epitaxy to determine the effect of alloying with Eu on both superconductivity and ferroelectricity, both of which are present in strainedfilms. Remarkably, superconductivity survives up to. Films at the lowest alloy concentration studied here,, exhibit no suppression of their superconducting transition temperature, but there is a strong reduction of the upper critical field, compared to nonalloyed, strainedfilms. In addition, these films lack the sharp ferroelectric transition that appears in films without Eu in second harmonic generation measurements. We postulate that Eu alloying causes a crossover from a globally ordered ferroelectric state to one with only short-range polar order. We discuss the connection between the loss of global polar order and the change in the superconducting properties.