Zobrazeno 1 - 10
of 195
pro vyhledávání: '"FREITAS, R. S."'
Autor:
Ramon, J. G. A., Wang, C. W., Ishida, L., Bernardo, P. L., Leite, M. M., Vichi, F. M., Gardner, J. S., Freitas, R. S.
Publikováno v:
Phys. Rev. B 99, 214442 (2019)
Neutron scattering, a.c. magnetic susceptibility and specific heat studies have been carried out on polycrystalline Dy2Zr2O7. Unlike the pyrochlore spin ice Dy2Ti2O7, Dy2Zr2O7 crystallizes into the fluorite structure and the magnetic Dy3+ moments ran
Externí odkaz:
http://arxiv.org/abs/1906.10738
Autor:
Cantarino, M. R., Amaral, R. P., Freitas, R. S., Araújo, J. C. R., Lora-Serrano, R., Luetkens, H., Baines, C., Bräuninger, S., Grinenko, V., Sarkar, R., Klauss, H. H., Andrade, E. C., Garcia, F. A.
Publikováno v:
Phys. Rev. B 99, 054412 (2019)
Magnetic frustration and disorder are key ingredients to prevent the onset of magnetic order. In the disordered hexagonal double perovskite BaTi$_{1/2}$Mn$_{1/2}$O$_{3}$, Mn$^{4+}$ cations, with $S=3/2$ spins, can either form highly correlated states
Externí odkaz:
http://arxiv.org/abs/1802.09950
Publikováno v:
Physical Review B 95, 184426 (2017)
Specific heat and magnetization measurements of the compound [Cu2(apyhist)2Cl2](ClO4)2, where apyhist = (4-imidazolyl)ethylene-2-amino-1-ethylpyridine), were used to identify a magnetic-field-induced long-range antiferromagnetic ordered phase at low
Externí odkaz:
http://arxiv.org/abs/1705.08879
From experimental and theoretical analyses of magnetic and specific-heat properties, we present the complete magnetic phase diagram of the quasi-one-dimensional antiferromagnet Cu(N$_2$H$_5$)$_2$(SO$_4$)$_2$. On cooling and at zero magnetic field thi
Externí odkaz:
http://arxiv.org/abs/1607.01846
Autor:
Hallas, A. M., Gaudet, J., Butch, N. P., Tachibana, M., Freitas, R. S., Luke, G. M., Wiebe, C. R., Gaulin, B. D.
Publikováno v:
Phys. Rev. B 93, 100403 (2016)
The ytterbium pyrochlore magnets, Yb2B2O7 (B = Sn, Ti, Ge) are well described by S_eff = 1/2 quantum spins decorating a network of corner-sharing tetrahedra and interacting via anisotropic exchange. Structurally, only the non-magnetic B-site cation,
Externí odkaz:
http://arxiv.org/abs/1602.09011
We investigate the behavior of ultrasharp metamagnetic transitions in La(5/8-y)Nd(y)Ca(3/8)MnO(3) manganites. These compounds change from a low temperature ferromagnetic metallic state at low Nd doping to a charge-ordered antiferromagnetic insulator
Externí odkaz:
http://arxiv.org/abs/1602.08594
Autor:
Hallas, A. M., Gaudet, J., Wilson, M. N., Munsie, T. J., Aczel, A. A., Stone, M. B., Freitas, R. S., Arevalo-Lopez, A. M., Attfield, J. P., Tachibana, M., Wiebe, C. R., Luke, G. M., Gaulin, B. D.
Publikováno v:
Phys. Rev. B 93, 104405 (2016)
We report neutron scattering and muon spin relaxation measurements (muSR) on the pyrochlore antiferromagnet Yb2Ge2O7. Inelastic neutron scattering was used to probe the transitions between crystal electric field levels, allowing us to determine the e
Externí odkaz:
http://arxiv.org/abs/1602.03833
Autor:
Dun, Z. L., Li, X., Freitas, R. S., Arrighi, E., Cruz, C. R. Dela, Lee, M., Choi, E. S., Cao, H. B., Silverstein, H. J., Wiebe, C. R., Cheng, J. G., Zhou, H. D.
Elastic neutron scattering, ac susceptibility, and specific heat experiments on the pyrochlores Er$_{2}$Ge$_{2}$O$_{7}$ and Yb$_{2}$Ge$_{2}$O$_{7}$ show that both systems are antiferromagnetically ordered in the $\Gamma_5$ manifold. The ground state
Externí odkaz:
http://arxiv.org/abs/1508.04489
Publikováno v:
APPLIED PHYSICS LETTERS 98, 013110 (2011)
The energy barrier distribution Eb of five samples with different concentrations x of Ni nanoparticles using scaling plots from ac magnetic susceptibility data has been determined. The scaling of the imaginary part of the susceptibility Chi"(nu, T) v
Externí odkaz:
http://arxiv.org/abs/1101.4147
Publikováno v:
Journal of Physics. Condensed Matter, v. 21, p. 436006, 2009
The magnetic structures of the title compounds have been studied by neutron diffraction. In contrast to the isomorphous RNi2B2C compounds wherein a variety of exotic incommensurate modulated structures has been observed, the magnetic structure of ErC
Externí odkaz:
http://arxiv.org/abs/0812.4867