Exotic Spin-Orbital Physics in Hybrid Oxides
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- 作者：Wojciech Brzezicki ; Mario Cuoco…
- 关键词：Orbital fluctuations ; Spin ; orbital order ; Orbital/charge dilution ; Doped Mott insulator
- 刊名：Journal of Superconductivity and Novel Magnetism
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：30
- 期：1
- 页码：129-134
- 全文大小：436KB
- 刊物类别：Physics and Astronomy
- 刊物主题：Strongly Correlated Systems, Superconductivity; Magnetism, Magnetic Materials; Condensed Matter Physics; Characterization and Evaluation of Materials;
- 出版者：Springer US
- ISSN：1557-1947
- 卷排序：30
文摘
We compare the effective spin-orbital superexchange triggered by magnetic 3d impurities with d3 and d2 configurations and either no orbital degree of freedom (orbital dilution) or hole replacing a doublon (charge dilution) in a 4d4 Mott insulator with S=1 spins. Impurities causing orbital dilution act either as spin defects decoupled from the surrounding ions or generate orbital polarons along d3- d4 hybrid bonds. The exchange on these bonds determines which orbital is occupied by a doublon on the host site. In case of charge dilution by 3d2 impurities additional \(\propto T_{i}^{+}T_{j}^{+}\) terms arise which enhance orbital fluctuations. We show that such terms may radically change orbital pattern at relatively low doping by x=1/8 hole defects. Our findings provide new perspective for future theoretical and experimental studies of doped transition metal oxides.