Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR835 papers
- The Ohio State UniversityUS812 papers
- Universidade de São PauloBR798 papers
- Panjab UniversityIN636 papers
- Universidade Federal do ABCBR635 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di TorinoIT634 papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR603 papers
- Benemérita Universidad Autónoma de PueblaMX594 papers
- European Organization for Nuclear ResearchCH583 papers
- Wayne State UniversityUS576 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di BolognaIT570 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di CataniaIT565 papers
81 papers · 1 filter
Crystal structures and magnetic order of La{0.5+delta}A{0.5-delta}Mn{0.5+epsilon}Ru{0.5-epsilon}O{3} (A= Ca, Sr, Ba): Possible orbital glass ferromagnetic state
Eduardo Granado, Qingzhen Huang, Jeff W. Lynn +2
The crystallographic and magnetic properties of La{0.5+delta}A{0.5-delta}Mn{0.5+epsilon}Ru{0.5-epsilon}O{3} (A= Ca, Sr, Ba) were investigated by means of neutron powder diffraction…
Revisiting Clifford algebras and spinors III: conformal structures and twistors in the paravector model of spacetime
Roldao da Rocha, Jayme Vaz
This paper is the third of a series of three, and it is the continuation of math-ph/0412074 and math-ph/0412075. After reviewing the conformal spacetime structure, conformal maps a…
Motion of Coloured Particles in Solitons of the O(3) Non-Linear Model
Rafael M. Fernandes, Patricio S. Letelier
We propose a consistent expression for the relativistic quadri-force referring to the classical interaction between a coloured particle and a scalar field multiplete. General aspec…
Linear and Circularly Polarized Light to Study Anisotropy and Resonant Scattering in Magnetic Thin Films
Helio C. N. Tolentino, Julio C. Cezar, Narcizo M. Souza-Neto +1
The remarkable polarization properties of the synchrotron light have lead to the advent of modern synchrotron-related spectroscopic studies with angular and/or magnetic selectivity…
Short-range charge-order in NiO perovskites (=Pr,Nd,Eu) probed by X-ray absorption spectroscopy
Cínthia Piamonteze, Hélio C. N. Tolentino, Aline Y. Ramos +4
The short-range organization around Ni atoms in orthorhombic NiO (=Pr,Nd,Eu) perovskites has been studied over a wide temperature range by Ni K-edge x-ray absorption sp…
Spin-orbit induced mixed-spin ground state in NiO perovskites probed by XAS: new insight into the metal to insulator transition
C. Piamonteze, F. M. F. de Groot, H. C. N. Tolentino +4
We report on a Ni L edges x-ray absorption spectroscopy (XAS) study in NiO perovskites. These compounds exhibit a metal to insulator () transition as temperature…
Local atomic and electronic structure in LaMnO_3 across the orbital ordering transition
Raquel A. Souza, Narcizo M. Souza-Neto, Aline Y. Ramos +2
The local atomic disorder and the electronic structure in the environment of manganese atoms in LaMnO_3 has been studied by x-ray absorption spectroscopy, over a temperature range…
Classical Dissipation and Asymptotic Equilibrium via Interaction with Chaotic Systems
M. V. S. Bonanca, M. A. M. de Aguiar
We study the energy flow between a one dimensional oscillator and a chaotic system with two degrees of freedom in the weak coupling limit. The oscillator's observables are averaged…
Conformal structures and twistors in the paravector model of spacetime
Roldao da Rocha, Jayme Vaz
Some properties of the Clifford algebras Cl(3,0), Cl(1,3), Cl(1,3)(C), Cl(4,1) and Cl(2,4) are presented, and three isomorphisms between the Dirac-Clifford algebra C x Cl(1,3) and…
Instanton sheaves on complex projective spaces
Marcos Jardim
We study a class of torsion-free sheaves on complex projective spaces which generalize the much studied mathematical instanton bundles. Instanton sheaves can be obtained as cohomol…
Spin Liquid Behavior in Electronic Griffiths Phases
D. Tanaskovic, V. Dobrosavljevic, E. Miranda
We examine the interplay of the Kondo effect and the RKKY interactions in electronic Griffiths phases using extended dynamical mean-field theory methods. We find that sub-Ohmic dis…
Semiclassical Husimi functions for spin systems
Marcel Novaes, Marcus A. M. de Aguiar
We derive a semiclassical approximation to the Husimi functions of stationary states of spin systems. We rederive the Bohr-Sommerfeld quantization for spin by locating the poles of…
Dirac Spinors and Flavor Oscillations
Alex E. Bernardini, Stefano De Leo
In the standard treatment of particle oscillations the mass eigenstates are implicitly assumed to be scalars and, consequently, the spinorial form of neutrino wave functions is not…
An Analytic Approach to the Wave Packet Formalism in Oscillation Phenomena
Alex E. Bernardini, Stefano De Leo
We introduce an approximation scheme to perform an analytic study of the oscillation phenomena in a pedagogical and comprehensive way. By using Gaussian wave packets, we show that…
Semiclassical Propagation of Wavepackets with Real and Complex Trajectories
M. A. M. de Aguiar, M. Baranger, L. Jaubert +2
We consider a semiclassical approximation for the time evolution of an originally gaussian wave packet in terms of complex trajectories. We also derive additional approximations re…
An Ambiguous Statement Called 'Tetrad Postulate' and the Correct Field Equations Satisfied by the Tetrad Fields
Waldyr A. Rodrigues, Quintino A. Gomes de Souza
The names tetrad, tetrads, cotetrads, have been used with many different meanings in the physical literature, not all of them, equivalent from the mathematical point of view. In th…
Topics on High-Energy Elastic Hadron Scattering
M. J. Menon
We review the main results we have obtained in the area of high-energy elastic hadron scattering and presented in this series of Workshops on Hadronic Interactions. After an introd…
Bundling up carbon nanotubes through Wigner defects
Antonio J. R. da Silva, A. Fazzio, Alex Antonelli
We show, using ab initio total energy density functional theory, that the so-called Wigner defects, an interstitial carbon atom right besides a vacancy, which are present in irradi…
Transport Properties for and Intermediate Valence Model of TlMnO
M. E. Foglio, G. E. Barberis
The appearance of colossal magneto resistance (CM) in TlMnO has stimulated many recent studies of the pyrochlore family of compounds ABO. The do…
Semiclassical limit of the entanglement in closed pure systems
Renato M. Angelo, Kyoko Furuya
We discuss the semiclassical limit of the entanglement for the class of closed pure systems. By means of analytical and numerical calculations we obtain two main results: (i) the s…
Spontaneous decay rates in active waveguides
A. A. Rieznik, G. Rigolin
We present a new method to measure the guided, radiated and total decay rates in one-dimensional waveguides. It is also theoretically shown that large modifications of the total de…
Dissipative dynamics of topological defects in frustrated Heisenberg spin systems
V. Juricic, L. Benfatto, A. O. Caldeira +1
We study the dynamics of topological defects of a frustrated spin system displaying spiral order. As a starting point we consider the SO(3) nonlinear sigma model to describe long-w…
Field-Tuned Quantum Critical Point in CeCoIn Near the Superconducting Upper Critical Field
F. Ronning, C. Capan, A. Bianchi +6
We report a systematic study of high magnetic field specific heat and resistivity in single crystals of CeCoIn_5 for the field oriented in the basal plane (H//ab) of this tetragona…
On the stability of general relativistic geometric thin disks
Maximiliano Ujevic, Patricio S. Letelier
The stability of general relativistic thin disks is investigated under a general first order perturbation of the energy momentum tensor. In particular, we consider temporal, radial…