192 research outputs found
Simple Exactly Solvable Models of non-Fermi Liquids
We generalize the model of Hatsugai and Kohmoto [J. Phys. Soc. Jpn, 61, 2056
(1992)] and find ground states which do not show the properties of Fermi
liquids. We work in two space dimensions, but it is straightforward to
generalize to higher dimensions. The ground state is highly degenerate and
there is no discontinuity in the momentum distribution; i.e., there is no Fermi
surface. The Green's function generically has a branch cut.Comment: Revte
Interaction of Laser Radiation with Plasmas and Nonadiabatic Motion of Particles in Magnetic Fields
Contains research objectives and reports on one research project.United States Atomic Energy Commission (Contract AT(30-1)-3285
Interaction of Laser Radiation with Plasmas and Nonadiabatic Motion of Particles in Magnetic Fields
Contains research objectives and reports on two research projects.United States Atomic Energy Commision under Contract AT(30-1)-328
Dissymmetrical tunnelling in heavy fermion metals
A tunnelling conductivity between a heavy fermion metal and a simple metallic
point is considered. We show that at low temperatures this conductivity can be
noticeably dissymmetrical with respect to the change of voltage bias. The
dissymmetry can be observed in experiments on the heavy fermion metals whose
electronic system has undergone the fermion condensation quantum phase
transition.Comment: 7 pages, Revte
Universal Behavior of Heavy-Fermion Metals Near a Quantum Critical Point
The behavior of the electronic system of heavy fermion metals is considered.
We show that there exist at least two main types of the behavior when the
system is nearby a quantum critical point which can be identified as the
fermion condensation quantum phase transition (FCQPT). We show that the first
type is represented by the behavior of a highly correlated Fermi-liquid, while
the second type is depicted by the behavior of a strongly correlated
Fermi-liquid. If the system approaches FCQPT from the disordered phase, it can
be viewed as a highly correlated Fermi-liquid which at low temperatures
exhibits the behavior of Landau Fermi liquid (LFL). At higher temperatures ,
it demonstrates the non-Fermi liquid (NFL) behavior which can be converted into
the LFL behavior by the application of magnetic fields . If the system has
undergone FCQPT, it can be considered as a strongly correlated Fermi-liquid
which demonstrates the NFL behavior even at low temperatures. It can be turned
into LFL by applying magnetic fields . We show that the effective mass
diverges at the very point that the N\'eel temperature goes to zero. The
phase diagrams of both liquids are studied. We demonstrate that these
phase diagrams have a strong impact on the main properties of heavy-fermion
metals such as the magnetoresistance, resistivity, specific heat,
magnetization, volume thermal expansion, etc.Comment: Revtex, 11 pages, revised and accepted by JETP Let
Interaction of Laser Radiation with Plasmas and Nonadiabatic Motion of Particles in Magnetic Fields
Contains research objectives.United States Atomic Energy Commission (Contract AT(30-1)-3285
Plasma Dynamics
Contains reports on two research projects.National Science Foundation (Grant GK-37979X1)U. S. Atomic Energy Commission (Contract AT(11-1)-3070
Doping effects in the coupled, two-leg spin ladder BiCu2PO6
We report preparation, x-ray diffraction, magnetic susceptibility chi(T) and
heat capacity Cp(T) measurements on the undoped samples as also samples with
Zn-doped (S = 0) at Cu site, Ni doped (S = 1) at Cu site, and Ca-doped (holes)
at Bi site in the coupled two-leg spin ladder system BiCu2PO6. While, Zn shows
complete solid solubility, Ni could be doped to about 20% and Ca to about 15%.
Magnetization and heat capacity data in the undoped compound point towards the
existence of frustration effects. In all the samples, the chi(T) at low
temperature increases with doping content. The Zn-induced susceptibility is
smaller than that due to effective S=1/2 moments possibly due to frustrating
next-nearest-neighbor interactions along the leg. For Zn content x > 0.01,
chi(T) deviates from the Curie-law at low temperatures. The magnetic specific
heat data Cm(T) for the Zn-doped samples show weak anomalies at low temperature
in agreement with chi(T) behavior. The anomalies are suggestive of spin
freezing at low-T. In contrast, prominent effects are observed in chi(T) and
Cm(T) on Ni-doped samples. The zero-field-cooled (ZFC) and field-cooled (FC)
chi(T) data are different from each other at low temperature unlike that for Zn
doped samples, clearly indicating a transition to a spin-glass like phase. No
anomalies were found in Ca- or Pb-doped samples.Comment: 16 pages, 9 figures, Submitted to J. Phy. Cond. Matte
Plasmas and Controlled Nuclear Fusion
Contains reports on ten research projects split into three sections.National Science Foundation (Grant GK-2581
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