Electronic phase behavior in spin-orbit Mott materials Stephen Wilson, Boston College, DMR 1056625 Our group is currently working to explore an exciting.

Slides:

Advertisements

Similar presentations

CAREER: The Stability and Influence of Metastable Retained Austenite During Fatigue of Advanced Steel Alloys Kip O. Findley, Colorado School of Mines,

Advertisements

The resistivity of bulk ferromagnetic metals depends on the angle between the magnetization and the electric current. This phenomenon was discovered by.

GOALI: Growth-dependent identification and control of defects and dopants in ZnO – DMR L. J. Brillson and D. C. Look A major objective of this.

Interacting charge and spin chains in high magnetic fields James S. Brooks, Florida State University, DMR [1] D. Graf et al., High Magnetic Field.

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.

Materials 286K Class 14, 4d and 5d Going from 3d to 4d, we expect broader bands, and for 5d, relativistic effects. The changes in.

IRIDATES Bill Flaherty Materials 286K, UCSB Dec. 8 th, 2014.

Role of Deformation Twinning in Strain Hardening and Texture Evolution: Experiment and Numerical Simulation S. R. Kalidindi & R. D. Doherty, Drexel University,

Region of maximum conductivity 1% 88% 2%31% 54% 64% 1% Fraction crystallinity Solid polymer electrolytes for lithium ion batteries Janna K. Maranas, Pennsylvania.

Superconductivity Characterized by- critical temperature T c - sudden loss of electrical resistance - expulsion of magnetic fields (Meissner Effect) Type.

Materials World Network: Self-assembled Nanocomposite Magnetoelectric Thin Films Nian Sun, Northeastern University, DMR Intellectual Merit:Fig.

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

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

Engaging in Transportation Engineering Initiatives with K-12 Students Elementary & Middle School Centennial Place Academy Overview Georgia Tech researchers.

CAREER: Rational Synthesis and Studies of Functionalized Carbon Nanotubes Stanislaus S. Wong, SUNY at Stony Brook, DMR Developing near-edge X-ray.

Strong spin-phonon coupling is responsible for a wide range of scientifically rich and technologically important phenomena—including multiferroic properties,

Multiple Bosonic Mode Coupling to Electron in (La 2−x Sr x )CuO 4 Ward Plummer, University of Tennessee, DMR Right: (a1)-(a4) shows the real part.

CAREER: The Evolution of Polar Nanoregions and Its Coupling with Cation-Ordered Domains in Pb(B'B'')O 3 Relaxor Ferroelectrics Xiaoli Tan (Iowa State University),

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,

Electronic instabilities Electron phonon BCS superconductor Localization in 1D - CDW Electron-electron (  ve exchange)d-wave superconductor Localization.

Insert Figure 1 approximately here. Bismuth nanowires or bismuth nanotubes? -Bismuth nanowires are a vehicle for the study of size- dependent electronic.

Micky Holcomb West Virginia University Bristow, Lederman, Stanescu & Wilson Micky Holcomb West Virginia University Bristow, Lederman, Stanescu & Wilson.

Colossal Magnetoresistance of Me x Mn 1-x S (Me = Fe, Cr) Sulfides G. A. Petrakovskii et al., JETP Lett. 72, 70 (2000) Y. Morimoto et al., Nature 380,

Organic conductors and superconductors go nano Eun Sang Choi, Florida State University, DMR [1] D. de Caro et al., Four Molecular Superconductors.

LaBella Group Towards an Atomic Scale Understanding of Spin Polarized Electron Transport Towards an Atomic.

Pressure effect on electrical conductivity of Mott insulator “Ba 2 IrO 4 ” Shimizu lab. ORII Daisuke 1.

Macroscopic Quantum Tunneling in 1-Dimensional Al Nanowires and Quasi-Bound States in Quantum Point Contacts (QPCs) Albert M. Chang, Duke University, DMR.

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

NOVEL MIXED-VALENT TRANSITION METAL OXIDES Mas A. Subramanian, Oregon State University, DMR This is an exploratory research project on the identification,

1 光電子分光でプローブする遷移金属酸化物薄膜の光照射効果 Photo-induced phenomena in transition-metal thin films probed by photoemission spectroscopy T. Mizokawa, J.-Y. Son, J. Quilty,

Spin polarization with a twist Nancy P. Sandler, Ohio University, DMR MWN/CIAM COLLABORATION USA-Brazil-Chile A well-known relativistic effect,

Neutron Scattering Studies of Tough Quantum Magnetism Problems

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.

J.P. Eisenstein, Caltech, DMR When two layers of electrons are brought close together in the presence of an intense magnetic field a new state.

Detection of Spin-Polarized Electrons:

Intraatomic vs Interatomic Interactions John B. Goodenough (University of Texas at Austin) DMR Intellectual Merit Localized electrons have stronger.

Example: Magnetic field control of the conducting and orbital phases of layered ruthenates, J. Karpus et al., Phys. Rev. Lett. 93, (2004)  Used.

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.

Research: Transition-metal oxides are multi-functional materials with potential novel applications in micro-electronics and information processing and.

Gabriel Kotliar, Strongly Correlated Materials: Insights From Dynamical Mean-Field Theory /9.

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.

New Applications of Strongly Correlated Materials James K. Freericks, Georgetown University, DMR Strongly correlated materials are materials in.

Electrons on the brink: Fractal patterns may be key to semiconductor magnetism Ali Yazdani, Princeton University, DMR Princeton-led team of scientists.

Frustrated magnets exhibit novel and useful properties, including dramatic field-sensitive properties and suppressed magnetic ordering temperatures. To.

Exploiting geometry to generate anisotropic interactions at the nanoscale and self-assembly of living clusters Angelo Cacciuto, Columbia University, DMR.

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).

Thermal Properties of ZrB 2 Ceramics William Fahrenholtz, Missouri University of Science and Technology, DMR % C ZrB 2 + pores 1% C Graphite inclusions.

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

From Local Moment to Mixed-Valence Regime in Ce 1−x Yb x CoIn 5 alloys Carmen Almasan, Kent State University, DMR Ce 1−x Yb x CoIn 5 alloys have.

Spin-orbital effects in frustrated antiferromagnets Oleg A. Starykh, University of Utah, DMR Electron spin resonance (ESR) measures absorption.

Spatially resolved quasiparticle tunneling spectroscopic studies of cuprate and iron-based high-temperature superconductors Nai-Chang Yeh, California Institute.

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.

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.

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

Bulk Hybridization Gap and Surface Conduction in the Kondo Insulator SmB 6 Richard L. Greene, University of Maryland College Park, DMR Recently,

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

Tunable Electron-Phonon Coupling in Carbon Nanotubes Moonsub Shim, University of Illinois, DMR EFEF K. Nguyen, A. Gaur, & M. Shim, Phys. Rev. Lett.

Low-temperature properties of the t 2g 1 Mott insulators of the t 2g 1 Mott insulators Interatomic exchange-coupling constants by 2nd-order perturbation.

The fabric, or the microscopic structure, of unconventional superconductivity in heavy-fermion materials continues to elude our complete understanding.

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.

Spin at the Nanoscale: Material Synthesis and Fundamental Physics Min Ouyang, University of Maryland – College Park, DMR In the FY08, we continued.

Tuning magnetic anisotropy in (001) oriented L1 0 (Fe 1-x Cu x ) 55 Pt 45 films Kai Liu, University of California-Davis, DMR Meeting the demand.

Spatially resolved quasiparticle tunneling spectroscopic studies of cuprate and iron-based high-temperature superconductors Nai-Chang Yeh, California Institute.

Ion Transport in Beta-Gallia Rutile Intergrowths Doreen Edwards, Alfred University, DMR Beta-gallia-rutile (BGR) intergrowths possess 1-D tunnels.

Atomic Resolution Imaging

New color centers in diamond for quantum information science

Single-molecule transistors: many-body physics and possible applications Douglas Natelson, Rice University, DMR (a) Transistors are semiconductor.

Phases of Mott-Hubbard Bilayers Ref: Ribeiro et al, cond-mat/

New Possibilities in Transition-metal oxide Heterostructures

Presentation transcript:

Electronic phase behavior in spin-orbit Mott materials Stephen Wilson, Boston College, DMR Our group is currently working to explore an exciting new frontier in complex oxides where spin orbit coupling and correlation effects conspire to stabilize new electronic phases. A leading example of this are spin- orbit Mott phases found within several classes of correlated iridates. Debate however remains as to whether these systems are trivial band or Mott insulators. Our work with collaborators has shown that the electronic gap in one such compound Sr 3 Ir 2 O 7 is much larger than expected and necessarily driven by the Coulomb interaction in a Mott ground state [1]. We have also established universalities among the magnetic and structural phase behaviors of the two prototypical spin- orbit Mott materials Sr 2 IrO 4 and Sr 3 Ir 2 O 7 [2]. Combined our results establish these correlated iridates as promising platforms for the future discovery of novel correlated electronic phases in presence of strong spin- orbit interactions. Ref. [1]: Yoshinori Okada, W. Zhou, D. Walkup, Chetan Dhital, Ziqiang Wang, Stephen D. Wilson, and V. Madhavan, “Imaging the evolution of metallic states in a spin-orbit interaction driven correlated iridate” Nature Materials 12, 707 (2013). Ref. [2]: Chetan Dhital, Tom Hogan, Z. Yamani, Clarina de la Cruz, Xiang Chen, Sovit Khadka, Zhensong Ren, and Stephen D. Wilson, “Neutron scattering study of correlated phase behavior in Sr 2 IrO 4 ” Physical Review B 87, (2013). Fig. 1: Scanning tunneling spectroscopy data showing electronically inhomogenous ground state of Sr 3 Ir 2 O 7 showing localized regions of small gap states residing within the larger insulating background [1]. Fig. 2: (left panel) Neutron scattering data showing the universality of antiferromagnetic phase behavior between classes of correlated iridates, Sr 2 IrO 4 and Sr 3 Ir 2 O 7 (right panel) Neutron data showing the presence of a high temperature distortion in Sr 2 IrO 4 paralleling that of Sr 3 Ir 2 O 7 [2].

Electronic phase behavior in spin-orbit Mott materials Stephen Wilson, Boston College, DMR Our group continues to provide research experience and exposure for undergraduate physics majors in hope of retaining them within STEM career pathways. In the current year, my group hosted 4 unique undergraduate interns in our lab. Two participated during the spring and fall semesters and two during the summer of 2013 (1 of which comes from an underrepresented African American demographic). I also continued my partnership with The Educational Cooperative through hosting another high school intern within my lab during the summer of Radha conducted a research project in support of the grant and obtained her first exposure in a modern science lab. Also, I continued to work in training the next generation of neutron scattering experts by lecturing at the NCNR neutron summer school as well as sending a graduate student to the Argonne/ORNL neutron summer program. Fig. 3: High school intern Radha Mastandrea working in the PI’s lab during the summer of 2013