Now showing items 1-17 of 17

  • AC susceptibility of the quantum critical point mimicking series Lix[Mn1.96Li0.04]O4 (x = 0.0,0.1,0.2,0.35,0.5,0.6,0.8,1.0) 

    Heitmann, Thomas; Gaddy, John; Lamsal, Jagat; Petrovic, Marcus; Montfrooij, Wouter (American Institute of Physics, 2010)
    The present work elucidates the series of magnetic phase transitions present in the series of spinel compounds Lix Mn1.96Li0.04 O4 x=0.0, 0.1, 0.2, 0.35, 0.5, 0.6, 0.8, 1.0 . These systems display dynamical scaling originating ...
  • Characterization of porous low-k films using variable angle spectroscopic ellipsometry 

    Othman, Maslin, 1977-; Lubguban, J. A.; Lubguban, Arnold A.; Gangopadhyay, Shubhra; Miller, R. D.; Volksen, W.; Kim, H.-C. (American Institute of Physics, 2006)
    Variable angle spectroscopic ellipsometry (VASE™) is used as a tool to characterize properties such as optical constant, thickness, refractive index depth profile, and pore volume fraction of single and bilayer porous low-k ...
  • Charge stacking in the half-doped manganites 

    Popovic, Zoran S.; Satpathy, Sashi Sekhar, 1956- (American Institute of Physics, 2002)
    The stability of the charge-stacked structure vis-à-vis the charge-alternate structure in the half-doped manganites is studied with a model that includes electronic kinetic energy, onsite and intersite Coulomb interactions, ...
  • Crystallization of amorphous silicon by self-propagation of nanoengineered thermites 

    Hossain, Maruf; Subramanian, Senthil; Bhattacharya, Shantanu, 1974-; Gao, Yuanfang; Apperson, Steven J., 1982-; Shende, Rajesh; Guha, Suchi; Arif, Mohammad, 1974-; Bai, Mengjun; Gangopadhyay, Keshab; Gangopadhyay, Shubhra (American Institute of Physics, 2007)
    Crystallization of amorphous silicon (a-Si) thin film occurred by the self-propagation of copper oxide/aluminum thermite nanocomposites. Amorphous Si films were prepared on glass at a temperature of 250 °C by plasma ...
  • Density‐functional studies of the electronic structure of the perovskite oxides: La1−xCaxMnO3 

    Satpathy, Sashi Sekhar, 1956-; Popovic, Zoran S.; Vukajlovic, Filip R. (American Institute of Physics, 1996)
    Using density‐functional methods, we study the electronic structures of the lanthanum‐based ''double‐exchange'' perovskite magnets. Antiferromagnetic insulating solutions are obtained for both the end members, LaMnO3 and ...
  • Effect of electrical bias on spin transport across a magnetic domain wall 

    Deutsch, Michael; Vignale, Giovanni, 1957-; Flatte, M. E. (American Institute of Physics, 2004)
    We present a theory of the current-voltage characteristics of a magnetic domain wall between two highly spin-polarized materials, which takes into account the effect of the electrical bias on the spin-flip probability of ...
  • Energetic stabilization of the Mizoguchi structure for magnetite by band-structure effects 

    Mishra, S. K.; Satpathy, Sashi Sekhar, 1956- (American Physical Society, 1993)
    We show that the Mizoguchi structure is energetically stabilized over the Verwey structure for magnetite by electron hopping on the B sublattice. We use the one-band Cullen-Callen model Hamiltonian for the electronic band ...
  • Ferrodistorsive orbital ordering in the layered nickelate NaNiO2: A density-functional study 

    Meskine, Hakim, 1972-; Satpathy, Sashi Sekhar, 1956- (American Institute of Physics, 2005)
    The electronic structure and magnetism in the sodium nickelate NaNiO2 in the low- temperature phase is studied from density-functional calculations using the linear muffin-tin orbitals method. An antiferromagnetic solution ...
  • Heterostructure unipolar spin transistors 

    Flatte, M. E.; Vignale, Giovanni, 1957- (American Institute of Physics, 2005)
    We extend the analogy between charge-based bipolar semiconductor electronics and spin-based unipolar electronics by considering unipolar spin transistors with different equilibrium spin splittings in the emitter, base, and ...
  • Jahn-Teller coupling and double exchange in the two-site Van Vleck-Kanamori model 

    Meskine, Hakim, 1972-; Satpathy, Sashi Sekhar, 1956- (American Institute of Physics, 1999)
    The effect of the dynamical Jahn-Teller coupling on the Anderson-Hasegawa double exchange (DE) in the manganites is studied in a two-site model taking into account the double degeneracy of the eg orbitals and their coupling ...
  • Magnetic ordering in the spinel compound Li[Mn2-xLix]O4(x=0,0.04) 

    Gaddy, John; Lamsal, Jagat; Petrovic, Marcus; Montfrooij, Wouter; Schmets, Alexander J. M.; Vojta, Thomas (American Institute of Physics, 2009)
    The two B-site ions Mn3+ and Mn4+ in the stoichiometric spinel structure LiMn2O4 form a complex, columnar ordered pattern below the charge-ordering transition at room temperature. On further cooling to below 66 K, the ...
  • Optical and structural properties of ZnO films deposited on GaAs by pulsed laser deposition 

    Ryu, Yung-ryel, 1964-; Zhu, S.; Budai, J. D.; Chandrasekhar, Holalkere R.; Miceli, Paul F.; White, H. W. (American Institute of Physics, 2000)
    ZnO films were synthesized on GaAs substrates at different growth conditions by pulse laser deposition. High-purity (99.999%) oxygen was used as the ambient gas. The pressure of the ambient oxygen gas for ZnO film growth ...
  • Pressure tuning of strain in CdTe/InSb epilayer: A photoluminescence and photomodulated reflectivity study 

    Boley, Mark S. (Mark Seymour), 1967-; Thomas, Robert J. (Robert James), 1967-; Chandrasekhar, Meera; Chandrasekhar, Holalkere R.; Ramdas, A. K.; Kobayashi, M.; Gunshor, R. L. (American Institute of Physics, 1993)
    The heavy‐hole and light‐hole excitons of a CdTe epilayer, pseudomorphically grown on an InSb epilayer by molecular beam epitaxy, are studied with a diamond anvil cell as a function of applied hydrostatic pressure via ...
  • The search for quantum critical scaling in a classical system 

    Lamsal, Jagat; Gaddy, John; Petrovic, Marcus; Montfrooij, Wouter; Vojta, Thomas (American Institute of Physics, 2009)
    Order-disorder phase transitions in magnetic metals that occur at zero temperature have been studied in great detail. Theorists have advanced scenarios for these quantum critical systems in which the unusual response can ...
  • Temperature dependence of strain in ZnSe(epilayer)/GaAs(epilayer) 

    Thomas, Robert J. (Robert James), 1967-; Rockwell, Benjamin A.; Chandrasekhar, Holalkere R.; Chandrasekhar, Meera; Ramdas, A. K.; Kobayashi, M.; Gunshor, R. L. (American Institute of Physics, 1995)
    A study of biaxial strain as a function of temperature in a ZnSe epilayer grown on a GaAs substrate is presented. The strains are determined by measuring the heavy‐ and light‐hole related excitonic transitions via ...
  • Theory of the composition dependence of the band offset and sheet carrier density in the GaN/AlxGa1−xN heterostructure 

    Satpathy, Sashi Sekhar, 1956-; Popovic, Zoran S.; Mitchel, W. C. (American Institute of Physics, 2004)
    We present a systematic study of the sheet carrier density and valence-band offset in the GaN/AlxGa1−xN(0001) heterostructure as a function of x from ab initio density-functional methods. We find that the calculated sheet ...
  • Verwey transition in magnetite: Mean‐field solution of the three‐band model 

    Mishra, S. K.; Zhang, Ze; Satpathy, Sashi Sekhar, 1956- (American Institute of Physics, 1994)
    The nature of the Verwey transition in magnetite (FqO,) within a three-band spinless model Hamiltonian is examined. These bands, which arise from the minority-spin tZg orbitals on the Fe(B) sublattice, are occupied by half ...