d0 Ferromagnetic Interface between Nonmagnetic Perovskites

被引：48

作者：

Oja, R. ^{[1
]}

Tyunina, M. ^{[2
,3
]}

Yao, L. ^{[4
]}

Pinomaa, T. ^{[1
]}

Kocourek, T. ^{[3
]}

Dejneka, A. ^{[3
]}

Stupakov, O. ^{[3
]}

Jelinek, M. ^{[3
]}

Trepakov, V. ^{[3
]}

van Dijken, S. ^{[4
]}

Nieminen, R. M. ^{[1
]}

机构：

[1] Aalto Univ, Dept Appl Phys, COMP Ctr Excellence, Helsinki 00076, Finland

[2] Univ Oulu, Microelect & Mat Phys Labs, Oulu 90014, Finland

[3] Acad Sci Czech Republic, Inst Phys, Prague 18221 8, Czech Republic

[4] Aalto Univ, Dept Appl Phys, NanoSpin, Helsinki 00076, Finland

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 12期

基金：

芬兰科学院;

关键词：

TRANSITION-METALS; MAGNETISM; OXIDES; LA2CUO4; SPIN;

D O I：

10.1103/PhysRevLett.109.127207

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use computational and experimental methods to study d(0) ferromagnetism at a charge-imbalanced interface between two perovskites. In SrTiO3/KTaO3 superlattice calculations, the charge imbalance introduces holes in the SrTiO3 layer, inducing a d(0) ferromagnetic half-metallic 2D hole gas at the interface oxygen 2p orbitals. The charge imbalance overrides doping by vacancies at realistic concentrations. Varying the constituent materials shows ferromagnetism to be a general property of hole-type d0 perovskite interfaces. Atomically sharp epitaxial d(0) SrTiO3/KTaO3, SrTiO3/KNbO3, and SrTiO3/NaNbO3 interfaces are found to exhibit ferromagnetic hysteresis at room temperature. We suggest that the behavior is due to the high density of states and exchange coupling at the oxygen t(1g) band in comparison with the more studied d band t(2g) symmetry electron gas.

引用

页数：5

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