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Title: Upper limit to magnetism in LaAIO3/SrTiO3 heterostructures

Conference ·
OSTI ID:1172199
 [1];  [1];  [2];  [1];  [3];  [3];  [4];  [4];  [4];  [5];  [5]
  1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Bhabha Atomic Research Center, Mumbai (India)
  3. Univ. Complutense de Madrid (Spain)
  4. Univ. of Twente, Enshede (Netherlands). Inst. for Nanotechnology
  5. Univ. of California San Diego, La Jolla, CA (United States). Center for Advanced Nanoscience
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In 2004 Ohtomo and Hwang reported unusually high conductivity in LaAl03 and SrTi03 bilayer samples. Since then, metallic conduction, superconductivity, magnetism, and coexistence of superconductivity and ferromagnetism have been attributed to LaAl03/SrTi03 interfaces. Very recently, two studies have reported large magnetic moments attributed to interfaces from measurement techniques that are unable to distinguish between interfacial and bulk magnetism. Consequently, it is imperative to perform magnetic measurements that by being intrinsically sensitive to interface magnetism are impervious to experimental artifacts suffered by bulk measurements. Using polarized neutron reflectometry we measured the neutron spin dependent reflectivity from four LaAl03/SrTi03 superlattices. Our results indicate 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 (consistent with past reports), possibly due to experimental artifacts. These observations set important restrictions on theories which imply a strongly enhanced magnetism at the interface between LaAI03 and SrTi03.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
AC52-06NA25396; FG03-87ER-45332
OSTI ID:
1172199
Report Number(s):
LA-UR-12-01007; LA-UR-12-1007
Resource Relation:
Conference: American Physical Society Meeting, Boston, MA (United States), 27 Feb 2012
Country of Publication:
United States
Language:
English

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75 CONDENSED MATTER PHYSICS
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