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arXiv 1901.09601cond-mat.str-el
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gamma-Al2O3/SrTiO3界面的磁性和电子性质

Magnetic and electronic properties at the gamma-Al2O3/SrTiO3 interface

J. R. L. Mardegan, D. V. Christensen, Y. Z. Chen, S. Parchenko, S. R. V. Avula, N. Ortiz-Hernandez, M. Decker, C. Piamonteze, N. Pryds, U. Staub

摘要:

γ-Al_2O_3/SrTiO_3尖晶石/钙钛矿界面的磁性和电子性质的探索通过X射线吸收光谱。结合原子多重态计算的偏振X射线技术揭示了局部磁矩分配给Ti 3+在界面上具有等效大小的平面内和平面外磁场方向。虽然磁指纹揭示,Ti 3+磁性可以解释为在低温下施加磁场下的顺磁响应。模拟的X射线线性二色性的结果在一个delta 0 = 1.9 eV之间的分裂的t2 g和eg状态的Ti 4 + 3d 0轨道。此外,这些结果表明,最低能量状态具有面外dxz/dyz对称性。各向同性的磁矩行为和最低能量的dxz/dyz状态是相反的观察在钙钛矿/钙钛矿界面的LaAlO 3/SrTiO 3,表现出各向异性的磁dxy基态的二维电子气。

英文摘要:

The magnetic and electronic nature of the gamma-Al2O3/SrTiO3 spinel/perovskite interface is explored by means of x-ray absorption spectroscopy. Polarized x-ray techniques combined with atomic multiplet calculations reveal localized magnetic moments assigned to Ti3+ at the interface with equivalent size for in- and out-of-plane magnetic field directions. Although magnetic fingerprints are revealed, the Ti3+ magnetism can be explained by a paramagnetic response at low temperature under applied magnetic fields. Modeling the x-ray linear dichroism results in a delta0 = 1.9 eV splitting between the t2g and eg states for the Ti4+ 3d0 orbitals. In addition these results indicate that the lowest energy states have the out-of-plane dxz/dyz symmetry. The isotropic magnetic moment behavior and the lowest energy dxz/dyz states are in contrast to the observations for the two-dimensional electron gas at the perovskite/perovskite interface of LaAlO3/SrTiO3, that exhibits an anisotropic magnetic dxy ground state.

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