154 research outputs found
God\u27s missional Spirit : the acts and agency of the Holy Spirit in the missional life
https://place.asburyseminary.edu/ecommonsatsdissertations/2424/thumbnail.jp
Emergent properties hidden in plane view: Strong electronic correlations at oxide interfaces
Finding new collective electronic states in materials is one of the
fundamental goals of condensed matter physics. Atomic-scale superlattices
formed from transition metal oxides are a particularly appealing hunting ground
for new physics. In bulk form, transition metal oxides exhibit a remarkable
range of magnetic, superconducting, and multiferroic phases that are of great
scientific interest and are potentially capable of providing innovative energy,
security, electronics and medical technology platforms. In superlattices new
states may emerge at the interfaces where dissimilar materials meet.
Here we illustrate the essential features that make transition metal
oxide-based heterostructures an appealing discovery platform for emergent
properties with a few selected examples, showing how charge redistributes,
magnetism and orbital polarization arises and ferroelectric order emerges from
heterostructures comprised of oxide components with nominally contradictory
behavior with the aim providing insight into the creation and control of novel
behavior at oxide interfaces by suitable mechanical, electrical or optical
boundary conditions and excitations.Comment: 16 pages, 5 figure
Emergent magnetic state in (111)-oriented quasi-two-dimensional spinel oxides
We report on the emergent magnetic state of (111)-oriented CoCr2O4 ultrathin
films sandwiched by Al2O3 in the quantum confined geometry. At the
two-dimensional crossover, polarized neutron reflectometry reveals an anomalous
enhancement of the total magnetization compared to the bulk value. Synchrotron
x-ray magnetic circular dichroism (XMCD) demonstrates the appearance of
long-range ferromagnetic ordering of spins on both Co and Cr sublattices.
Brillouin function analyses further corroborates that the observed phenomena
are due to the strongly altered magnetic frustration, manifested by the onset
of a Yafet-Kittel type ordering as the new ground state in the ultrathin limit,
which is unattainable in the bulk
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