Spin-orbit coupling controlled ground states in the double perovskite iridates A2BIrO6 ( A= Ba, Sr; B= Lu, Sc)
Spin-orbit coupling controlled ground states in the double perovskite iridates A2BIrO6 ( A= Ba, Sr; B= Lu, Sc)
复制标题
双钙钛矿虹彩 A2BIrO6 中自旋轨道耦合控制的基态 (A= Ba, Sr; B= Lu, Sc)
DOI：
10.1103/physrevmaterials.6.094409
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发表时间：
2022
影响因子：
3.4
通讯作者：
LaManna, N.
中科院分区：
文献类型：
--
作者：
Aczel, A. A.;Chen, Q.;Clancy, J. P.;dela Cruz, C.;Reig-i-Plessis, D.;MacDougall, G. J.;Pollock, C. J.;Upton, M. H.;Williams, T. J.;LaManna, N.
具有电子构型的铱酸盐最近引起了人们的兴趣，这是由于磁有序基态的报道，尽管长期以来人们期望它们的强自旋轨道耦合将为每个子产生电子基态。现有研究的主要焦点是双钙钛矿铱化物，其中基态的性质（即，然而，这仍然是一个有争议的问题。在这里，我们提出了中子粉末衍射，高能量分辨率荧光检测的X射线吸收光谱（HERFD-XAS），共振非弹性X射线散射（RIXS），磁化率和μ子自旋弛豫数据相关的双钙钛矿铱酸盐，使我们能够获得一般的理解，为这个家庭的材料的电子和磁性。我们的HERFD-XAS和RIXS测量在所有情况下都建立了离子的电子基态，Hund耦合和自旋轨道耦合常数具有相似的值。我们的体磁化率和μ子自旋弛豫数据没有发现长程磁序或自旋冻结的证据，但它们确实表现出与非本征局部矩一致的弱磁信号。我们的研究结果表明，大的是在双钙钛矿铱酸盐中实现的电子和磁性基态背后的关键驱动力，这与传统的观点一致。
Iridates with theelectronic configuration have attracted recent interest due to reports of magnetically ordered ground states despite longstanding expectations that their strong spin-orbit coupling would generate aelectronic ground state for eachion. The major focus of prior research has been on the double perovskite iridatesand, where the nature of the ground states (i.e., ordered vs nonmagnetic) is still controversial. Here, we present neutron powder diffraction, high-energy-resolution fluorescence-detected x-ray absorption spectroscopy (HERFD-XAS), resonant inelastic x-ray scattering (RIXS), magnetic susceptibility, and muon spin relaxation data on the related double perovskite iridates, andthat enable us to gain a general understanding of the electronic and magnetic properties for this family of materials. Our HERFD-XAS and RIXS measurements establishelectronic ground states for theions in all cases, with similar values for Hund's couplingand the spin-orbit coupling constant. Our bulk susceptibility and muon spin relaxation data find no evidence for long-range magnetic order or spin freezing, but they do exhibit weak magnetic signals that are consistent with extrinsic local moments. Our results indicate that the largeis the key driving force behind the electronic and magnetic ground states realized in thedouble perovskite iridates, which agrees well with conventional wisdom.