期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.217201
关键词
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资金
- Office of Basic Energy Science, U.S. Department of Energy
- BES-DMS
- Department of Energy's Office of Basic Energy Science, DMR [DE FG03-87ER-45332]
- DOE [DE-AC52-06NA25396]
- Consolider Ingenio [CSD2009-00013, CAM S2009-MAT 1756]
- Foundation for Fundamental Research on Matter (FOM)
Using polarized neutron reflectometry we measured the neutron spin-dependent reflectivity from four LaAlO3/SrTiO3 superlattices. Our results imply that the upper limit for the magnetization averaged over the lateral dimensions of the sample induced by an 11 T magnetic field at 1.7 K is less than 2 G. SQUID magnetometry of the neutron superlattice samples sporadically finds an enhanced moment, possibly due to experimental artifacts. These observations set important restrictions on theories which imply a strongly enhanced magnetism at the interface between LaAlO3 and SrTiO3.
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