Bulletin of the American Physical Society
85th Annual Meeting of the APS Southeastern Section
Volume 63, Number 19
Thursday–Saturday, November 8–10, 2018; Holiday Inn at World’s Fair Park, Knoxville, Tennessee
Session B03: 2D States, Emerging Thin Film Materials, and Interfaces |
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Chair: Norman Mannella, University of Tennessee, Knoxville Room: Holiday Inn Knoxville Downtown LeConte |
Thursday, November 8, 2018 11:00AM - 11:30AM |
B03.00001: Visualizing Interface Quantum Physics on the Atomic Level Invited Speaker: Ward Plummer Laughlin and Pines correctly observed “Seeing is the Beginning of Understanding.” Modern aberration corrected electron microscopy and spectroscopy is allowing the community to “see” the origin of interfacial physics on an atomic scale, resulting the ability to “design” interfaces. I will describe two different interface systems to illustrate recent progress: 1) New quantum states (magnetism) achieved at heterointerfaces, and; 2) Structural origin of optimal superconductivity in layered Fe based superconductor. High-resolution electron microscopy and spectroscopy are revolutionizing our ability to see and control interfaces. |
Thursday, November 8, 2018 11:30AM - 12:00PM |
B03.00002: Tuning Orbital and Magnetic Interactions through Strain at Complex Oxide Interfaces Invited Speaker: Divine P Kumah Transition metal complex oxide possess a plethora of exotic properties including superconductivity, ferroelectricity and magnetic and metal-insulator transitions. These interesting properties arise due to the interplay between structural, electronic, spin and orbital degrees of freedom. The ability to combine atomic layers of different complex oxides using molecular beam epitaxy has led to the emergence of novel functional properties due to the coupling of order parameters at the resulting interfaces. In this talk, the emergence of orbital and spin ordering at the interfaces between atomic layers of La0.7Sr0.3CrO3 and La0.7Sr0.3MnO3 will be discussed. Using a combination of atomic-scale synchrotron diffraction-based imaging, soft X-ray magnetic spectroscopy and temperature-dependent magnometry, we show that the orbital and spin ordering can be modulated by epitaxial strain leading to the confinement of ferromagnetism in two-dimensional magnetic oxide layers. |
Thursday, November 8, 2018 12:00PM - 12:30PM |
B03.00003: Tuning the Dimensionality of Materials with Strongly Correlated Electrons between 1D and 2D Invited Speaker: Ambrose Seo Tuning the dimensionality of a system offers a useful tool for realizing new quantum phenomena associated with critical phase transitions and topological properties. However, only a few naturally occurring materials with tunable, intrinsic 1D and 2D structures are available for experimental studies. In this talk, I will present a new approach of synthesizing 1D – 2D quantum systems by creating dimensionally-confined stripe-superlattices from in-plane oriented layered materials. For example, we have demonstrated this method to synthesize 1D – 2D IrO2 stripes using a-axis oriented superlattices of Sr2IrO4 and insulating (La,Sr)GaO4, both are of the K2NiF4 symmetry [1]. The dimensional confinement of the superlattices has been confirmed by structural characterizations. Optical spectroscopy shows clear anisotropic characteristics and dimensional electronic confinement of the spin-orbit coupled Jeff = 1/2 band. Spin and orbital excitations observed in resonant inelastic x-ray scattering spectra suggest larger exchange interactions and more confined orbital excitations in the 1D IrO2 stripes as compared to its 2D counterpart. The observed electronic confinement and localized spin-structure are quite consistent with density functional theory calculations. This method of tuning the dimensionality between 1D and 2D via stripe-superlattices is a viable technique for obtaining dimensionality-induced quantum phase transitions in materials with strongly correlated electrons. [1] J. H. Gruenewald et al., Adv. Mater. 29, 163798 (2017). |
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