P. Fazekas

Institute for Technical Physics and Materials Science

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

L. Forró

École Polytechnique Fédérale de Lausanne

Karlo Penc

Wigner Research Centre for Physics

H. Berger

École Polytechnique Fédérale de Lausanne

I. Kézsmárki

University of Augsburg

G. Mihály

Budapest University of Technology and Economics

Annamária Kiss

Université Claude Bernard Lyon 1

N. Barišić

TU Wien

Katalin Radnóczi

Institute for Solid State Physics and Optics

Hae‐Young Kee

University of Toronto

Erio Tosatti

Scuola Internazionale Superiore di Studi Avanzati

Cooperative Institutions

Hungarian Academy of Sciences

École Polytechnique Fédérale de Lausanne

Budapest University of Technology and Economics

Institute for Solid State Physics and Optics

Centre National de la Recherche Scientifique

Eötvös Loránd University

University of Cologne

Budapest Institute

Wigner Research Centre for Physics

University of Lausanne

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Sequence of Multipolar Transitions: Scenarios for URu₂Si₂

Progress of Theoretical Physics Supplement (2005)

P. Fazekas Annamária Kiss Katalin Radnóczi

d- and f-shells support a large number of local degrees of freedom: dipoles, quadrupoles, octupoles, hexadecapoles, etc. Usually, the ordering of any multipole component leaves the system sufficiently symmetrical to allow a second symmetry breaking transition. Assuming that a second continuous phase transition occurs, we classify the possibilities. We construct the symmetry group of the first ordered phase, and then re-classify the order parameters in the new symmetry. While this is straightforward for dipole or quadrupole order, it is less familiar for octupole order.

Tetragonal crystal system

10.1143/ptps.160.114

Cite

Citations (15)

The role of many particle intermediate states in the formation of the Abrikosov-Suhl resonance

Physics Letters A (1969)

P. Fazekas A. Zawadowski

Particle (ecology)

10.1016/0375-9601(69)90676-8

Cite

Citations (3)

Resonante Valenzbindungen: Geschichte eines aktuellen Begriffs

Physik Journal (1989)

P. Fazekas E. Müller‐Hartmann

10.1002/phbl.19890450106

Cite

Citations (1)

Dynamics of impurity spin above the Kondo temperature

Zeitschrift für Physik A Hadrons and Nuclei (1969)

A. Zawadowski P. Fazekas

Propagator

Anderson impurity model

10.1007/bf01392088

Cite

Citations (25)

UNDERSCREENED KONDO NECKLACE

Modern Physics Letters B (1992)

P. Fazekas Hae‐Young Kee

It has been suggested recently by Gan, Coleman, and Andrei that studying the underscreened Kondo problem may help to understand the nature of magnetism in heavy fermion systems. Motivated by Doniach’s work on the S=1/2 Kondo necklace, we introduce the underscreened Kondo necklace models with S>1/2. The underscreened Kondo necklace is the simplest lattice model on which the competition between Kondo spin compensation, and magnetic ordering due to an RKKY-type interaction can be examined. We used the mean-field approximation to determine the phase diagram, and found that the low-temperature phase is always an x−y antiferromagnet. This contention is further supported by the derivation of the exact form of the effective Hamiltonian in the limit of very large Kondo coupling: it is found to be an antiferromagnetic x−y model for the residual S−1/2 spins. In general, the degree of moment compensation depends on both the Kondo coupling, and on S.

Hamiltonian (control theory)

Magnetism

Kondo insulator

10.1142/s0217984992001381

Cite

Citations (1)

Perturbation theory for the triangular Heisenberg antiferromagnet with Ising-like anisotropy

Zeitschrift für Physik B Condensed Matter (1992)

B. Kleine P. Fazekas E. M�ller-Hartmann

Heisenberg model

Hexagonal Lattice

10.1007/bf01323734

Cite

Citations (7)

A manifestation of the frustration effect in S=1/2 quantum spin systems

Journal of Physics C Solid State Physics (1980)

P. Fazekas

The ground state properties of S=1/2 anisotropic Heisenberg magnets with plaquette frustration are investigated. The models can be classified according to whether a straightforward generalisation of the Marshall ansatz (1955) can be applied, or whether the ground state has to be approximated by a linear combination of Ising ground states. In the former case, the quantum ground state may have a zero-point entropy. In the latter case, a unique ground state with quantum liquid-like coherence properties is postulated, generalising an earlier suggestion by Fazekas and Anderson (1974).

10.1088/0022-3719/13/10/001

Cite

Citations (16)

Electron energy loss spectrometry

Werner Kraus P. Fazekas

Source

Cite

Citations (0)

Improved Gutzwiller Ansatz and Gutzwiller approximation for strongly correlated electron systems

Physica C Superconductivity (1988)

P. Fazekas

Ansatz