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28 papers · 2 filters
Effects of a Parallel Magnetic Field on the Metal-Insulator Transition in a Dilute Two-Dimensional Electron System
Kevin Eng, X. G. Feng, Dragana Popovic +1
The temperature dependence of conductivity of a two-dimensional electron system in silicon has been studied in parallel magnetic fields B. At B=0, the system displays a meta…
A Phase Glass is a Bose Metal: New Conducting State in 2D
Denis Dalidovich, Philip Phillips
In the quantum rotor model with random exchange interactions having a non-zero mean, three phases, a 1) phase (Bose) glass, 2) superfluid, and 3) Mott insulator, meet at a bi-criti…
Direct Measurement of the Spin Hamiltonian and Observation of Condensation of Magnons in the 2D Frustrated Quantum Magnet Cs2CuCl4
R. Coldea, D. A. Tennant, K. Habicht +3
We propose a method for measuring spin Hamiltonians and apply it to the spin-1/2 Heisenberg antiferromagnet Cs2CuCl4, which shows a 2D fractionalized RVB state at low fields. By ap…
Evolution of magnetic polarons and spin-carrier interactions through the metal-insulator transition in EuGdO
H. Rho, C. S. Snow, S. L. Cooper +3
Raman scattering studies as functions of temperature, magnetic field, and Gd-substitution are used to investigate the evolution of magnetic polarons and spin-carrier interactions t…
Superconductivity in the two-dimensional t-J model
S. Sorella, G. B. Martins, F. Becca +4
Using computational techniques, it is shown that pairing is a robust property of hole doped antiferromagnetic (AF) insulators. In one dimension (1D) and for two-leg ladder systems,…
Specific Heat of CeRhIn5: Pressure-Driven Evolution of the Ground State from Antiferromagnetism to Superconductivity
R. A. Fisher, F. Bouquet, N. E. Phillips +5
Measurements of the specific heat of antiferromagnetic CeRhIn5, to 21 kbar, and for 21 kbar to 70 kOe, show a discontinuous change from an antiferromagnetic ground state below 15 k…
Unusual kondo behavior in the indium-rich heavy fermion antiferromagnet Ce3Pt4In13
M. F. Hundley, J. L. Sarrao, J. D. Thompson +4
We report the thermodynamic, magnetic, and electronic transport properties of the new ternary intermetallic system (Ce,La)3Pt4In13. Ce3Pt4In13 orders antiferromagnetically at 0.95…
Prediction of Orbital Ordering in Single-Layered Ruthenates
Takashi Hotta, Elbio Dagotto
The key role of the orbital degree of freedom to understand the magnetic properties of layered ruthenates is here discussed. In the G-type antiferromagnetic phase of CaRuO,…
Bulk Band Gaps in Divalent Hexaborides: A Soft X-Ray Emission Study
J. D. Denlinger, G. -H. Gweon, J. W. Allen +2
Boron K-edge soft x-ray emission and absorption are used to address the fundamental question of whether divalent hexaborides are intrinsic semimetals or defect-doped bandgap insula…
Different Gd3+ sites in CaB6: an ESR study
R. R. Urbano, C. Rettori, G. E. Barberis +8
The local environment of Gd3+ (4f7 S=7/2) ions in single crystals of Ca1-xGdxB6 (0.0001 < x < 0.01) is studied by means of Electron Spin Resonance (ESR). The spectra for low concen…
ARPES Study of X-Point Band Overlaps in LaB and SmB - Contrast to SrB and EuB
S. -K. Mo, G. -H. Gweon, J. D. Denlinger +6
In contrast to our recent finding of an X-point band gap in divalent hexaborides, we report here that angle resolved photoemission spectroscopy (ARPES) data shows that the gap is a…
Bulk Band Gaps in Divalent Hexaborides
J. D. Denlinger, J. A. Clack, J. W. Allen +6
Complementary angle-resolved photoemission and bulk-sensitive k-resolved resonant inelastic x-ray scattering of divalent hexaborides reveal a >1 eV X-point gap between the valence…
Colossal Effects in Transition Metal Oxides Caused by Intrinsic Inhomogeneities
J. Burgy, M. Mayr, V. Martin-Mayor +2
The influence of quenched disorder on the competition between ordered states separated by a first-order transition is investigated. A phase diagram with features resembling quantum…
Localized f electrons in CexLa1-xRhIn5: dHvA Measurements
U. Alver, R. G. Goodrich, N. Harrison +8
Measurements of the de Haas-van Alphen effect in CexLa1-xRhIn5 reveal that the Ce 4f electrons remain localized for all x, with the mass enhancement and progressive loss of one spi…
Onset of Glassy Dynamics in a Two-Dimensional Electron System in Silicon
Snezana Bogdanovich, Dragana Popovic
The time-dependent fluctuations of conductivity σhave been studied in a two-dimensional electron system in low-mobility, small-size Si inversion layers. The noise power spectrum is…
Crystal-field effects in the first-order valence transition in YbInCu4 induced by an external magnetic field
M. Dzero
As it was shown earlier [Dzero, Gor'kov, and Zvezdin, J. Phys.:Condens. Matter 12, L711 (2000)] the properties of the first-order valence phase transition in YbInCu4 in the wide ra…
Anomalous NMR Magnetic Shifts in CeCoIn_5
N. J. Curro, B. Simovic, P. C. Hammel +4
We report ^{115}In and ^{59}Co Nuclear Magnetic Resonance (NMR) measurements in the heavy fermion superconductor CeCoIn_5 above and below T_c. The hyperfine couplings of the In and…
Doping dependence of the electrical and thermal transport properties of CaB6
K. Gianno', A. V. Sologubenko, H. R. Ott +2
The thermoelectric power S and the thermal conductivity k of stoichiometric and vacancy-doped CaB6 have been measured between 5 and 300 K. The thermopower of both materials is surp…
Magnetothemopower study of quasi two-dimensional organic conductor -(BEDT-TTF)KHg(SCN)
E. S. Choi, J. S. Brooks, J. S. Qualls
We have used a low-frequency magneto-thermopower (MTEP) method to probe the high magnetic field ground state behavior of -(BEDT-TTF)KHg(SCN) along all three principal cr…
Anomalous Superconducting Properties and Field Induced Magnetism in CeCoIn5
T. P. Murphy, Donavan Hall, E. C. Palm +7
In the heavy fermion superconductor CeCoIn5 (Tc=2.3K) the critical field is large, anisotropic and displays hysteresis. The magnitude of the critical-field anisotropy in the a-c pl…
Magnetic Field Effects on the Far-Infrared Absorption in Mn_12-acetate
A. B. Sushkov, B. R. Jones, J. L. Musfeldt +3
We report the far-infrared spectra of the molecular nanomagnet Mn_12-acetate (Mn_12) as a function of temperature (5-300 K) and magnetic field (0-17 T). The large number of observe…
Superconductivity in an organic insulator at very high magnetic fields
L. Balicas, J. S. Brooks, K. Storr +7
We investigate by electrical transport the field-induced superconducting state (FISC) in the organic conductor -(BETS)FeCl. Below 4 K, antiferromagnetic-insulator, metal…
Exact Solution of Heisenberg-liquid models with long-range coupling
Yupeng Wang, P. Schlottmann
We present the exact solution of two Heisenberg-liquid models of particles with arbitrary spin interacting via a hyperbolic long-range potential. In one model the spin-spin cou…
Heavy-fermion superconductivity in CeCoIn5 at 2.3K
C. Petrovic, P. G. Pagliuso, M. F. Hundley +5
We report the observation of heavy-fermion superconducitivity in CeCoIn5 at Tc =2.3 K. When compared to the pressure-induced Tc of its cubic relative CeIn3 (Tc ~200 mK), the Tc of…