When and why are ultrathin films of metallic oxides not metallic? Jiandi Zhang, Louisiana State University & Agricultural and Mechanical College, DMR 1005562.

Slides:

Advertisements

Similar presentations

Optical properties of (SrMnO 3 ) n /(LaMnO 3 ) 2n superlattices: an insulator-to-metal transition observed in the absence of disorder A. Perucchi.

Advertisements

Non-Fermi liquid behavior and changing coherence in Ce 1−x Yb x CoIn 5 Carmen C. Almasan, Kent State University, DMR Evolution of the coherence.

Lecture 1: A New Beginning References, contacts, etc. Why Study Many Body Physics? Basis for new Devices Complex Emergent Phenomena Describe Experiments.

Perovskite-type transition metal oxide interfaces

National Science Foundation Increasing thermo-electric conversion efficiency by defect engineering Robert F. Klie, University of Illinois at Chicago, DMR.

University of Illinois Non-linear Electrodynamic Response of Dielectric Materials microwave applications (radar, etc) phase shifters tuned filters voltage.

Emergent phenomena at oxide interfaces Chen Ke, Liu Donghao, Lv Peng, Shen Bingran, Yan Qirui, Yang Wuhao, Ye Qijun, Zhu Chenji Nov. 19 th.

Epitaxial Graphene: a New Platform for Carbon Electronics Materials Development State of the Art Education and Diversity The GT MRSEC has been developing.

For energy generation, capture storage and transportation.

1 Sodium Doped Lanthanum Manganites Thin Films: Synthesis, Substrate Effect and Thickness Dependence Paolo Ghigna Dipartimento di Chimica Fisica “M. Rolla”,

GROWTH AND INVESTIGATION OF HALF-METALLIC Fe 3 O 4 THIN FILMS B. Vengalis, V. Lisauskas, A. Lisauskas, K.Šliužienė, V. Jasutis Semiconductor Physics Institute,

Noise data plotted together with d 2 I/dV 2 as a function of bias enable one to tentatively associate noise maxima with changes in the number of the localized.

High Temperature Copper Oxide Superconductors: Properties, Theory and Applications in Society Presented by Thomas Hines in partial fulfillment of Physics.

Magnetoelastic Coupling and Domain Reconstruction in La 0.7 Sr 0.3 MnO 3 Thin Films Epitaxially Grown on SrTiO 3 D. A. Mota IFIMUP and IN-Institute of.

Interface Spin Orbit Coupling in a Thin Film Superconductor Philip W. Adams, Louisiana State University, DMR We have recently completed a series.

Mott Transition, i.e., the interaction-driven metal-to- insulator transition (MIT), is a fundamental issue in the physics of strongly correlated electron.

Superconducting/Semiconducting Nanowires, Nanotubes, and Ultrathin Films Wenhao Wu, Texas A&M University, DMR We use membranes with a honeycomb.

National Science Foundation Non-Destructive Structural Characterization Technique Yayoi Takamura, University of California-Davis, DMR Thomson scattering.

High-pressure synthesis of new oxide Dy 2 Ge 2 O 7 and high-pressure study on crystal and magnetic structures of the perovskite LaCrO 3 John B. Goodenough,

More than a decade ago: Accelerator development enabled visionary science probe-before-destroy Haidu et al. soft x-ray magnetic holography Wang, et al.

Exceptionally Low Thermal Conductivity in Layered Perovskites: Natural Superlattices David R. Clarke, University of California-Santa Barbara, DMR

“Bottom-Up” Design of Nanostructured Conducting Polymer Thin Films Evgueni E. Nesterov, Louisiana State University & Agricultural and Mechanical College,

Electrical Behavior of TiO 2 Grain Boundaries E.C. Dickey (PI), Pennsylvania State University, DMR Electroceramics are utilized in a wide variety.

National Science Foundation Outcome: Dr. Jain and her group at UConn has fabricated nanocomposite films showing (i) magnetoelectric properties: 0-3 type.

Complex Epitaxial Oxides: Synthesis and Scanning Probe Microscopy Goutam Sheet, 1 Udai Raj Singh, 2 Anjan K. Gupta, 2 Ho Won Jang, 3 Chang-Beom Eom 3 and.

National Science Foundation Enhanced Pyroelectric and Electrocaloric Effects in Complex Oxide Thin Film Heterostructures Lane W. Martin, University of.

On the way to neutron scattering at 40 T Report from this workshop Discussions with NSF/DOE/SNS Letter of Intent to SNS Conceptual design project proposal.

Quantum criticality –The physics of quantum critical phase transitions connects to some of the most challenging and technologically relevant problems in.

National Science Foundation Nanocomposite Magnetoelectric Films Menka Jain, University of Connecticut, DMR Outcome: Dr. Jain and group at UConn.

National Science Foundation Goal: Development of new catalysts, anode and cathode materials is critical for advancing fuel cell technology. An alternative.

Electrical Transport in Thin Film Nanostructures Hanno H. Weitering, The University of Tennessee, DMR Competing periodicities in a single atom.

Department of Chemistry Seminar Announcement Date/Time/VenueTitle/Speaker 14 Mar (Mon) 11am – S8 Level 3 Executive Classroom Structure and Dynamics.

Quantum Confinement in Nanostructures Confined in: 1 Direction: Quantum well (thin film) Two-dimensional electrons 2 Directions: Quantum wire One-dimensional.

High-pressure study on the crystal structure and the spin-state of Ni ions in the triple-layer T′-La 4 Ni 3 O 8 John B. Goodenough, University of Texas.

Manipulation of Structural and Physical Properties by Chemical Doping in Sr 3 (Ru 1-x Mn x ) 2 O 7 E. Ward Plummer, Louisiana State University & Agricultural.

1 BROOKHAVEN SCIENCE ASSOCIATES End-station for Soft X-ray Diffraction Microscopy Stuart Wilkins CMPMSD, BNL.

National Science Foundation GOALI: Epitaxial Growth of Perovskite Films and Heterostructures by Atomic Layer Deposition and Molecular Beam Epitaxy John.

THE JUNIOR LABORATORY: A PLACE TO INTRODUCE BASICS AS WELL AS NEW FINDINGS Luz J. Martínez-Miranda, O. C. Wilson, Jr. and L. G. Salamanca-Riba Dept. of.

Electrical Transport in Thin Film Nanostructures Hanno H. Weitering, The University of Tennessee, DMR Understanding and control of electrical conductivity.

Anomalous correlated electron phenomena in Yb 2 Fe 12 P 7 M. Brian Maple, University of California-San Diego, DMR Temperature – magnetic field.

Metal-Insulator Transition via Spatially Heterogeneous State Jongsoo Yoon, University of Virginia, DMR Differential resistance (dV/dI) of a 5nm.

Correlated Electron State in Ce 1-x Yb x CoIn 5 Stabilized by Cooperative Valence Fluctuations Brian M. Maple, University of California, San Diego, DMR.

Photoinduced phase-separation in Bi 0.4 Ca 0.6 MnO 3 thin films Vera Smolyaninova DMR Doped rare-earth manganese oxides (manganites) exhibit a.

Non-Fermi Liquid Behavior in Weak Itinerant Ferromagnet MnSi Nirmal Ghimire April 20, 2010 In Class Presentation Solid State Physics II Instructor: Elbio.

Synthesis and Properties of Magnetic Ceramic Nanoparticles Monica Sorescu, Duquesne University, DMR Outcome Researchers in Duquesne University.

Exploring the effect of uniaxial strain in Ba(Fe 1-x Co x ) 2 As 2 Stephen D. Wilson, Boston College, DMR Physical Review Letters 108, (2012).

Spectroscopy with a Twist Infrared magneto-polarization measurements John Cerne, University at Buffalo, SUNY, DMR Hall conductivity in the high.

National Science Foundation Outcome: Epitaxial integration of VO 2 based thin film heterostructures on sapphire and silicon substrates of various orientations.

From quasi-2D metal with ferromagnetic bilayers to Mott insulator with G-type antiferromagnetic order in Ca 3 (Ru 1−x Ti x ) 2 O 7 Zhiqiang Mao, Tulane.

Electric-field Effect on Transition Properties in a Strongly Correlated Electron (La,Pr,Ca)MnO 3 Film Electric Double Layer Transistor Source Drain Gate.

Surface Phases of Complex Oxides: Ca 2-x Sr x RuO 4 E. Ward Plummer, University of Tennessee, DMR (funded jointly by NSF and DOE/DMS&E ) The exotic.

Past and Future Insights from Neutron Scattering Collin Broholm * Johns Hopkins University and NIST Center for Neutron Research  Virtues and Limitations.

Doped rare-earth manganese oxides (manganites) exhibit a wide variety of physical phenomena due to complex interplay of electronic, magnetic, orbital,

Magnetized States of Quantum Spin Chains

Magnetic Moments in Amorphous Semiconductors Frances Hellman, University of California, Berkeley, DMR This project looks at the effect of magnetic.

Electrical Transport in Thin Film Nanostructures Hanno H. Weitering, The University of Tennessee, DMR Understanding and control of electrical conductivity.

Magnetism Close to the Metal-Insulator Transition in V 2 O 3 The Metal-Insulator Transition in V 2 O 3 Metallic V 2-y O 3 - Quantum critical heavy fermions.

Electronic phase behavior in spin-orbit Mott materials Stephen Wilson, Boston College, DMR Our group is currently working to explore an exciting.

Investigation of Half-Metallic Magnetic Oxides Jinke Tang, University of Wyoming, DMR Polytetrafluoroethylene (C n F 2n+2 ), also known as Teflon,

Non-Fermi liquid behavior with and without quantum criticality in Ce 1−x Yb x CoIn 5 Carmen C. Almasan, Kent State University, DMR One of the greatest.

Pengcheng Dai The University of Tennessee (UT) Institute of Physics, Chinese Academy of Sciences (IOP) Evolution of spin excitations.

MBE Growth of Graded Structures for Polarized Electron Emitters

Supported by Wang Dao Project (UROP)

Structural Quantum Size Effects in Pb/Si(111)

Superlattices of Perovskite Structured Materials for Solid Oxide Fuel Cells Yayoi Takamura, Department of Chemical Engineering and Materials Science, UC.

The Structure and Reactivity of PdO Surfaces

Revealing Hidden Phases in Materials

Colossal Magnetoresistance

Amorphous to Crystalline Transition in Indium Oxide Semiconductors

Temperature dependant transport behavior of Bismuth

Presentation transcript:

When and why are ultrathin films of metallic oxides not metallic? Jiandi Zhang, Louisiana State University & Agricultural and Mechanical College, DMR In contrast with the metallic or even superconducting phenomenon emerging at the interface of two insulating oxides (i.g., LaAlO 3 /SrTiO 3 ), several ultra thin films of metallic oxides exhibit non metallic behavior, challenging our understanding of these materials at interface. The main issue is to understand when and why are ultrathin films of metallic oxides not metallic. We have been working on both SrVO 3 and La 1-x Sr x MnO 3 (x=0.3) (LSMO) films on SrTiO 3 (STO) (001) substrate with our laser-MBE growth and in-situ characterization for structure, chemical composition, and electronic properties, as well as ex-situ transport measurements. For LSMO films, we have found a minimum critical thickness for metallicity as well as a giant response in film transport to the substrate structural phase transition at T = 106 K. These results clearly indicate many new and exciting phenomena can emerge in CMEs through broken symmetry as well as spatial confinement. STM images on the unreconstructed surface of (a) STO (with electron diffraction image as the inset) and (c) 10 unit cell (U.C.) LSMO film as well as (b) a ball model of the interface between LSMO/STO; (d) the metal-insulator transition temperature (T C ) vs. the thickness of the films grown in different oxygen partial pressure, with the inset for the minimum non- metallic ‘deal-layer’ thickness evolution; and (e) normalized resistivity near the structural transition temperature (~106 K) of the substrate for 5, 6, and 7 U.C. thickness of the stoichiometric films.

The research training mainly focuses on the training of graduate as well as undergraduate students. Andrew Antony is undergraduate student in physics and a member of the LSU “Chancellor’s Future Leaders in Research” program. He is working with our graduate students for the growth of oxide films, participating in some basic materials characterization. His undergraduate research is to study the chemical composition in oxide films by using AR-XPS. He is also involved in some design of experimental setup with our graduate students. Dalgis Mesa is Hispanic graduate student and supported by this grant. Her thesis research focuses on correlation between lattice and spin degrees of freedom in the bulk transition-metal oxides related to the project by using elastic and inelastic neutron scattering, especially the metal- to-insulator transition accompanied with magnetic phase transition in doped manganites and ruthenates. She is using national neutron facilities including these at ORNL and NIST. When and why are ultrathin films of metallic oxides not metallic? Jiandi Zhang, Louisiana State University & Agricultural and Mechanical College, DMR An international collaboration program on both research and education for exploring emergent phenomena at the surface and interface of correlated electron materials has established between LSU (including Prof. E.W. Plummer and Prof. R. Jin) and the Institute of Physics (IOP), the Chinese Academy of Science. The program focuses on the training of dual-degree Ph. D. students. The picture of the collaborative group was taken at IOP.