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35 papers · 2 filters
Electronic Structure of Novel Cation-Radical Salts in High Magnetic Fields
J. S. Brooks, L. Balicas, K. Storr +10
Two organic conducting materials, where unusual aspects of their composition play important roles, are explored: beta''-(BEDT-TTF)2SF5XSO3 which exhibits superconductivity, or a me…
A New Heavy-Fermion Superconductor CeIrIn5: Relative of the Cuprates?
C. Petrovic, R. Movshovich, M. Jaime +5
CeIrIn5 is a member of a new family of heavy-fermion compounds and has a Sommerfeld specific heat coefficient of 720 mJ/mol-K2. It exhibits a bulk, thermodynamic transition to a su…
Superconductivity and Magnetism in a New Class of Heavy-Fermion Materials
J. D. Thompson, R. Movshovich, Z. Fisk +11
We report a new family of Ce-based heavy-fermion compounds whose electronic specific heat coefficients range from about 400 to over 700 mJ/mole Ce-K2. Crystal in this family form a…
Colossal Magnetoresistant Materials: The Key Role of Phase Separation
Elbio Dagotto, Takashi Hotta, Adriana Moreo
The study of the manganese oxides, widely known as manganites, that exhibit the ``Colossal'' Magnetoresistance (CMR) effect is among the main areas of research within the area of S…
Effects of a parallel magnetic field on the novel metallic behavior in two dimensions
K. Eng, X. G. Feng, Dragana Popovic +1
Magnetoconductance (MC) in a parallel magnetic field B has been measured in a two-dimensional electron system in Si, in the regime where the conductivity decreases as σ(n_s,T,B=0)=…
Stripes Induced by Orbital Ordering in Layered Manganites
Takashi Hotta, Adrian Feiguin, Elbio Dagotto
Spin-charge-orbital ordered structures in doped layered manganites are investigated using an orbital-degenerate double-exchange model tightly coupled to Jahn-Teller distortions. In…
Magnetic field-dependent interplay between incoherent and Fermi liquid transport mechanisms in low-dimensional tau phase organic conductors
K. Storr, L. Balicas, J. S. Brooks +2
We present an electrical transport study of the 2-dimensional (2D) organic conductor tau-(P-(S,S)-DMEDT-TTF)_2(AuBr)_2(AuBr_2)_y (y = 0.75) at low temperatures and high magnetic fi…
NMR relaxation rates in spin-1/2 antiferromagnetic chains
V. Barzykin
We consider the low-temperature behavior of NMR relaxation rates and in the spin-1/2 antiferromagnetic chain. We find that and $T_{2G} \propto \s…
Electronic Structure of CeRhIn: dHvA and Energy Band Calculations
Donavan Hall, E. Palm, T. Murphy +10
The de Haas - van Alphen effect and energy band calculations are used to study angular dependent extremal areas and effective masses of the Fermi surface of the highly correlated a…
Griffiths phase of the Kondo insulator fixed point
E. Miranda, V. Dobrosavljevic
Heavy fermion compounds have long been identified as systems which are extremely sensitive to the presence of impurities and other imperfections. In recent years, both experimental…
Magnetic Polarons and the Metal-Semiconductor Transition in (Eu,La)B6 and EuO: Raman Scattering Studies
C. S. Snow, S. L. Cooper, D. P. Young +3
We present inelastic light scattering measurements of EuO and EuLaB (=0, 0.005, 0.01, 0.03, and 0.05) as functions of doping, B isotope, magnetic field, and te…
Unconventional superconductivity in CeIrIn and CeCoIn: Specific heat and thermal conductivity studies
R. Movshovich, M. Jaime, J. D. Thompson +4
Low temperature specific heat and thermal conductivity measurements on the ambient pressure heavy fermion superconductors CeIrIn5 and CeCoIn5 reveal power law temperature dependenc…
Anomalous NMR Spin-Lattice Relaxation in SrB_{6} and Ca_{1-x}La_{x}B_{6}
J. L. Gavilano, Sh. Mushkolaj, D. Rau +4
We report the results of {11}B nuclear magnetic resonance (NMR) measurements of SrB_{6} and Ca_{0.995}La_{0.05}B_{6} below room temperature. Although the electrical resistivities o…
Origin of Spin Incommensurability in Hole-doped S=1 Chains
Andre Luiz Malvezzi, Elbio Dagotto
Spin incommensurability has been recently experimentally discovered in the hole-doped Ni-oxide chain compound (G. Xu {\it al.}, Science {\bf 289}, 419 (…
The Magnetic Spin Ladder (C_{5}H_{12}N)_{2}CuBr_{4}: High Field Magnetization and Scaling Near Quantum Criticality
B. C. Watson, V. N. Kotov, M. W. Meisel +9
The magnetization, T, 0.7 K K), from single crystals and powder samples of (CHN)CuBr has been used to identify this system…
Coqblin-Schrieffer impurity in a singular metal
Yupeng Wang, P. Schlottmann
A Coqblin-Schrieffer impurity of spin coupled to the boundary of an open SU(N)-invariant chain with is studied. The model is integrable as a function of one co…
Open su(4)-invariant spin ladder with boundary defects
Yupeng Wang, P. Schlottmann
The integrable su(4)-invariant spin-ladder model with boundary defect is studied using the Bethe ansatz method. The exact phase diagram for the ground state is given and the bounda…
First order valence transition in YbInCu_4 in the (B,T) - plane
M. O. Dzero, L. P. Gor'kov, A. K. Zvezdin
The puzzling properties of the first order phase transition in YbInCu and its alloys in the wide range of magnetic fields and temperatures are perfectly described in terms of a…
Resistivity of Mixed-Phase Manganites
Matthias Mayr, Adriana Moreo, Jose A. Verges +3
The resistivity of manganites is studied using a random-resistor-network, based on phase-separation between metallic and insulating domains. When percolation occurs, both…
Indications of Spin-Charge Separation at Short Distance and Stripe Formation in the Extended t-J Model on Ladders and Planes
G. B. Martins, J. C. Xavier, C. Gazza +2
The recently discussed tendency of holes to generate nontrivial spin environments in the extended two-dimensional t-J model (G. Martins, R. Eder, and E. Dagotto, Phys. Rev. B{\bf 6…
Optical study of the electronic phase transition of strongly correlated YbInCu_4
Sean R. Garner, Jason N. Hancock, Yvonne W. Rodriguez +4
Infrared, visible and near-UV reflectivity measurements are used to obtain conductivity as a function of temperature and frequency in YbInCu_4, which exhibits an isostructural phas…
Stripes in the Ising Limit of Models for the Cuprates
G. B. Martins, C. Gazza, E. Dagotto
The hole-doped standard and extended t-J models on ladders with anisotropic Heisenberg interactions are studied computationally in the interval (, Ising;…
Spin waves and electronic interactions in La2CuO4
R. Coldea, S. M. Hayden, G. Aeppli +5
The magnetic excitations of the square-lattice spin-1/2 antiferromagnet and high-Tc parent La2CuO4 are determined using high-resolution inelastic neutron scattering. Sharp spin wav…
Magnetoresistance From Quantum Interference Effects in Ferromagnets
N. Manyala, Y Siids, J. F. DiTusa +3
The desire to maximize the sensitivity of read/write heads and thus the information density of magnetic storage devices has produced an intense interest in the magnetoresistance (M…