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Spin freezing of the spin-glass Fe0.25Zn0,75F2: a Mossbauer study

Araújo, José Humberto de; Cunha, Joao Batista Marimon da; Vasquez, Adalberto; Montenegro, F. C.; Rezende, S. M.; Amara, Lovelyn; Moro, J. T.; Coutinho-Filho, Mauricio D. (Brazil Journal Physics, 1991-01)

We report 57~e Mõssbauer measurements in the diluted Ising antiferromagnet Fe0.25Zn0,75F2 at temperatures between 4.2 and 28 K. DC susceptibility measurements in the same sample show a spin-glass phase at a freezing ...

Congelamento inverso em um modelo de vidro de spin com Clusters

Silva, Cintia Fernandes da (Universidade Federal de Santa MariaBRFísicaUFSMPrograma de Pós-Graduação em Física, 2014-08-29)

This work analyzes a spin glass (SG) model with cluster in two versions: a classic version with Ising spins and in a fermionic version with spin operators. In this model, the basic entities are correlated clusters that ...

Spin-glass-like behavior of uncompensated surface spins in NiO nanoparticulated powder

Aragon, F. H.; de Souza, P. E. N.; Coaquira, J. A. H.; Hidalgo, P.; Gouvea, D. (ELSEVIER SCIENCE BVAMSTERDAM, 2013-08-02)

Nickel oxide nonoparticles successfully synthesized by a polymer percursor method are studied in this work. The analysis of X-ray powder diffraction data provides a mean crystallite size of 22 +/- 2 nm which is in a good ...

Spin-phonon coupling in uniaxial anisotropic spin-glass based on Fe2TiO5 pseudobrookite

Cantoblanco; Universidade Federal de São Carlos (UFSCar); Universidade de São Paulo (USP); Federal University of Pelotas; Universidade Federal de Minas Gerais (UFMG); Universidade Estadual Paulista (Unesp) (2019-08-30)

The ferric pseudobrookite is a rare example of uniaxial anisotropic spin-glass insulator, depicting a multiglass behavior and magnetoelectric coupling. Here, we present Raman spectroscopy results in order to elucidate the ...

Anomalous out-of-equilibrium dynamics in the spin-ice material Dy2Ti2O7 under moderate magnetic fields

Guruciaga, Pamela C.; Pili, L.; Boyeras Baldomá, Santiago; Slobinsky, Demian Gustavo; Grigera, Santiago Andrés; Borzi, Rodolfo Alberto (2020)

Spin freezing in the disordered pyrochlore magnet NaCaCo2F7: NMR studies and Monte Carlo simulations

Tech Univ Dresden; Princeton Univ; Universidade Estadual Paulista (Unesp); Universidade de São Paulo (USP); Univ Melbourne (Amer Physical Soc, 2017-12-12)

We present results of Na-23 and F-19 nuclear magnetic resonance (NMR) measurements on NaCaCo2F7, a frustrated pyrochlore magnet with a Curie-Weiss temperature Theta(CW) approximate to -140 K and intrinsic bond disorder. ...

Spin freezing in the disordered pyrochlore magnet NaCaCo2 F7: NMR studies and Monte Carlo simulations

Technische Universität Dresden; Princeton University; Universidade Estadual Paulista (UNESP); Universidade de São Paulo (USP); University of Melbourne (2017-12-12)

We present results of Na23 and F19 nuclear magnetic resonance (NMR) measurements on NaCaCo2F7, a frustrated pyrochlore magnet with a Curie-Weiss temperature ΘCW≈-140 K and intrinsic bond disorder. Below 3.6 K both the Na23 ...

Exchange bias properties and surface spins freezing in ferrite nanoparticles of magnetic nanocolloids

Silva, Franciscarlos Gomes; Aquino, Renata; Dupuis, Vicent; Depeyrot, Jérôme; Tourinho, Francisco Augusto; Perzynski, Régine (2010)

Signatures of a quantum dynamical phase transition in a three-spin system in presence of a spin environment

Alvarez, Gonzalo Agustin; Levstein, Patricia Rebeca; Pastawski, Horacio Miguel (Elsevier Science, 2007-12)

We have observed an environmentally induced quantum dynamical phase transition in the dynamics of a two-spin experimental swapping gate [G.A. Álvarez, E.P. Danieli, P.R. Levstein, H.M. Pastawski, J. Chem. Phys. 124 (2006) ...

Physical and mechanical properties of raspberries subjected to osmotic dehydration and further dehydration by air- and freeze-drying

Sette, Paula Andrea; Salvatori, Daniela Marisol; Schebor, Carolina Claudia (Institution of Chemical Engineers, 2016-10-06)

The aim of this study was to analyze the effect of the application of dry and wet sucrose infusions, as pretreatments previous to air- and freeze-drying, on mechanical and physical properties of raspberries: water sorption, ...

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