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24 papers · 2 filters
High magnetic field induced charge density wave states in a quasi-one dimensional organic conductor
D. Graf, E. S. Choi, J. S. Brooks +3
We have measured the high field magnetoresistence and magnetization of quasi-one- dimensional (Q1D) organic conductor (Per)2Pt(mnt)2 (where Per = perylene and mnt = maleonitriledit…
Charge-density Waves Survive the Pauli Paramagnetic Limit
R. McDonald, N. Harrison, L. Balicas +3
Measurements of the resistance of single crystals of (Per)Au(mnt) have been made at magnetic fields of up to 45 T, exceeding the Pauli paramagnetic limit of $B_{\rm P}\…
Pseudogap behavior of nuclear spin relaxation in high Tc superconductors in terms of phase separation
L. P. Gor'kov, G. B. Teitel'baum
We analyze anew experiments on the NMR in cuprates and find an important information on their phase separation and its stripe character hidden in the dependence of o…
Suppression of a charge density wave ground state in high magnetic fields: spin and orbital mechanisms
D. Graf, J. S. Brooks, E. S. Choi +4
The charge density wave (CDW) transition temperature in the quasi-one dimensional (Q1D) organic material of (Per)Au(mnt) is relatively low (TCDW = 12 K). Hence in a mean fi…
Kondo Scaling in the Optical Response of YbIn_(1-x)Ag_xCu_4
Jason N. Hancock, Tim McKnew, Zack Schlesinger +2
Theoretical work on Kondo systems predicts universality in the scaling of observable quantities with the Kondo temperature, T_K. Here we report infrared-frequency optical response…
Phase Inhomogeneity of the Itinerant Ferromagnet MnSi at High Pressures
W. Yu, F. Zamborszky, J. D. Thompson +4
The pressure induced quantum phase transition of the weakly itinerant ferromagnet MnSi is studied using zero-field NMR spectroscopy and relaxation. Below $P^*\approx 1.2G…
Breakup of a Stoner model for the 2D ferromagnetic quantum critical point
M. Dzero, L. P. Gor'kov
Re-interpretation of the results by [A. V. Chubukov et. al., Phys. Rev. Lett. 90, 077002 (2003)] leads to the conclusion that ferromagnetic quantum critical point (FQCP) cannot be…
Electronic transport in EuB
G. A. Wigger, R. Monnier, H. R. Ott +2
EuB is a magnetic semiconductor in which defects introduce charge carriers into the conduction band with the Fermi energy varying with temperature and magnetic field. We presen…
Characterization of the S = 9 excited state in Fe8Br8 by Electron Paramagnetic Resonance
D. Zipse, J. M. North, N. S. Dalal +2
High Frequency electron paramagnetic resonance has been used to observe the magnetic dipole, M = 1, transitions in the excited state of the single molecule ma…
Relevance of Cooperative Lattice Effects and Correlated Disorder in Phase-Separation Theories for CMR Manganites
Jan Burgy, Adriana Moreo, Elbio Dagotto
Previous theoretical investigations of colossal magnetoresistance (CMR) materials explain this effect using a ``clustered'' state with preformed ferromagnetic islands that rapidly…
Magneto-optical Kerr effect in
G. Caimi, S. Broderick, H. R. Ott +3
We have measured the magneto-optical Kerr rotation of ferromagnetic with x=0.2 and 0.4, as well as of serving as the non-magnetic reference material…
Optical evidence for a spin-filter effect in the charge transport of
A. Perucchi, G. Caimi, H. R. Ott +3
We have measured the optical reflectivity of as a function of temperature between 1.5 and 300 and in external magnetic fields up to 7 . The sl…
Clustered States as a New Paradigm of Condensed Matter Physics
G. Alvarez, E. Dagotto
We argue that several materials of much current interest in condensed matter physics share common phenomenological aspects that only very recent investigations are unveiling. The l…
Heat capacity scaling function for confined superfluids
Kwangsik Nho, Efstratios Manousakis
We study the specific heat scaling function of superfluids confined in cubic geometry and in parallel-plate (film) geometry with open boundary conditions (BC) along the finite dime…
Temperature dependent transport of correlated disordered electrons: elastic vs. inelastic scattering
M. C. O. Aguiar, E. Miranda, V. Dobrosavljevic +2
Temperature dependent transport of disordered electronic systems is examined in the presence of strong correlations. In contrast to what is assumed in Fermi liquid approaches, fini…
Disorder Screening in Strongly Correlated Systems
D. Tanaskovic, V. Dobrosavljevic, E. Abrahams +1
Electron-electron interactions generally reduce the low temperature resistivity due to the screening of the impurity potential by the electron gas. In the weak-coupling limit, the…
Theoretical Study of Half-Doped Models for Manganites: Fragility of the CE Phase with Disorder, Two Types of Colossal Magnetoresistances, and Charge-Ordered States for Electron-Doped Materials
H. Aliaga, D. Magnoux, A. Moreo +3
A comprehensive analysis of half-doped manganites is presented using Monte Carlo simulations applied to the double-exchange model with cooperative Jahn-Teller lattice distortions i…
Single-Band Model for Diluted Magnetic Semiconductors: Dynamical and Transport Properties and Relevance of Clustered States
G. Alvarez, E. Dagotto
Dynamical and transport properties of a simple single-band spin-fermion lattice model for (III,Mn)V diluted magnetic semiconductors (DMS) is here discussed using Monte Carlo simula…
Glass Transition in a Two-Dimensional Electron System in Silicon in a Parallel Magnetic Field
J. Jaroszynski, Dragana Popovic, T. M. Klapwijk
Studies of low-frequency resistance noise show that the glassy freezing of the two-dimensional electron system (2DES) in Si in the vicinity of the metal-insulator transition (MIT)…
First order transition from correlated electron semiconductor to ferromagnetic metal in single crystalline FeSi1-xGex
S. Yeo, S. Nakatsuji, A. D. Bianchi +5
The phase diagram of FeSi1-xGex, obtained from magnetic, thermal and transport measurements on single crystals, shows a first-order transition from a correlated electron semiconduc…
Melting transition of an Ising glass driven by magnetic field
L. Arrachea, D. Dalidovich, V. Dobrosavljević +1
The quantum critical behavior of the Ising glass in a magnetic field is investigated. We focus on the spin glass to paramagnet transition of the transverse degrees of freedom in th…
New Aspects of the Temperature-Magnetic Field Phase Diagram of CeB6
R. G. Goodrich, David P. Young, Donavan Hall +6
We have measured the magnetic field dependence of the paramagnetic to the field-induced high temperature antiferroquadrupolar magnetically ordered phase transition is CeB6 from 0 t…
Theory for spin and orbital orderings in high temperature phase in
Theja N. De Silva, Anuvrat Joshi, Michael Ma +1
Motivated by the recent neutron diffraction experiment on , we consider a microscopic model where each ion is occupied by two 3d electrons of parallel spins with tw…
Localization effects and inelastic scattering in disordered heavy electrons
M. C. O. Aguiar, E. Miranda, V. Dobrosavljevic
We study ground state and finite temperature properties of disordered heavy fermion metals by using a generalization of dynamical mean field theory which incorporates Anderson loca…