期刊
NATURE MATERIALS
卷 13, 期 5, 页码 481-487出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3914
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资金
- Los Alamos LDRD program under the US DOE, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
- NSF [DMR-0804432]
- MRSEC Program of the NSF [DMR-0819885]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1206278] Funding Source: National Science Foundation
Strontium titanate (SrTiO3) is a foundational material in the emerging field of complex oxide electronics. Although its bulk electronic and optical properties are rich and have been studied for decades, SrTiO3 has recently become a renewed focus of materials research catalysed in part by the discovery of superconductivity and magnetism at interfaces between SrTiO3 and other non-magnetic oxides. Here we illustrate a new aspect to the phenomenology of magnetism in SrTiO3 by reporting the observation of an optically induced and persistent magnetization in slightly oxygen-deficient bulk SrTiO3-delta crystals using magnetic circular dichroism (MCD) spectroscopy and SQUID magnetometry. This zero-field magnetization appears below similar to 18 K, persists for hours below 10 K, and is tunable by means of the polarization and wavelength of sub-bandgap (400-500 nm) light. These effects occur only in crystals containing oxygen vacancies, revealing a detailed interplay between magnetism, lattice defects, and light in an archetypal complex oxide material.
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