Nodal superconducting exchange coupling.,Nature Materials

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Nodal superconducting exchange coupling.
Nature Materials ( IF 37.2 ) Pub Date : 2019-09-16 , DOI: 10.1038/s41563-019-0476-3
A Di Bernardo _{1,

2} , S Komori ₁ , G Livanas ₃ , G Divitini ₁ , P Gentile ₃ , M Cuoco ₃ , J W A Robinson ₁

Affiliation

A superconducting spin valve consists of a thin-film superconductor between two ferromagnetic layers. A change of magnetization alignment shifts the superconducting transition temperature (ΔΤc) due to an interplay between the magnetic exchange energy and the superconducting condensate. The magnitude of ΔΤc scales inversely with the superconductor thickness (dS) and is zero when dS exceeds the superconducting coherence length (ξ). Here, we report a superconducting spin-valve effect involving a different underlying mechanism in which magnetization alignment and ΔΤc are determined by nodal quasiparticle excitation states on the Fermi surface of the d-wave superconductor YBa2Cu3O7-δ sandwiched between insulating layers of ferromagnetic Pr0.8Ca0.2MnO3. We observe ΔΤc values that approach 2 K with the sign of ΔΤc oscillating with dS over a length scale exceeding 100ξ and, for particular values of dS, the superconducting state reinforces an antiparallel magnetization alignment. These results pave the way to all-oxide superconducting memory in which superconductivity modulates the magnetic state.

中文翻译：

节点超导交换耦合。

超导自旋阀由两个铁磁层之间的薄膜超导体组成。由于磁交换能量和超导凝聚体之间的相互作用，磁化排列的变化会使超导转变温度 (ΔΤc) 发生偏移。ΔΤc 的大小与超导体厚度 (dS) 成反比，并且当 dS 超过超导相干长度 (ξ) 时为零。在这里，我们报告了一种超导自旋阀效应，涉及不同的潜在机制，其中磁化排列和 ΔΤc 由夹在铁磁 Pr0.8Ca0 绝缘层之间的 d 波超导体 YBa2Cu3O7-δ 的费米表面上的节点准粒子激发态决定.2MnO3。我们观察到接近 2 K 的 ΔΤc 值，其中 ΔΤc 的符号在超过 100ξ 的长度范围内随 dS 振荡，并且对于 dS 的特定值，超导状态增强了反平行磁化排列。这些结果为超导调节磁性状态的全氧化物超导存储器铺平了道路。

更新日期：2019-09-16

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