Annamaria Kiss
Tohoku University
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Featured researches published by Annamaria Kiss.
Journal of the Physical Society of Japan | 2009
Yoshio Kuramoto; Hiroaki Kusunose; Annamaria Kiss
In this paper we review experimental and theoretical results on higher electronic multipoles in solids with strong correlations. Recent experiments and their theoretical interpretation have confirmed the ordering of octupoles and even higher multipoles in rare-earth and actinide compounds with f electrons. The concept of multipoles is critically examined in point groups where spherical tensors of different ranks mix. Using a phenomenological approach, we demonstrate how linear and nonlinear couplings of different multipoles lead to rich phase diagrams and anomalies in physical observables. As actual representative systems, we first consider Ce x La 1- x B 6 , for which resonant X-ray scattering probed the octupole order for the first time, and NpO 2 , where quadrupoles induced by the octupole order have been observed. We then consider a class of compounds called skutterudites as the most convenient system for systematic study. Particular emphasis is placed on the ordering of scalar components from fourth-...
Journal of the Physical Society of Japan | 2006
Annamaria Kiss; Yoshio Kuramoto
Phenomenological Landau analysis shows that the properties of ordered phases in some skutterudites are consistently accounted for by a scalar-order parameter which preserves the cubic symmetry, even in the ordered phase. A universal value is found for the anisotropy ratio of the transition temperature in a magnetic field, homogeneous magnetization, and induced staggered magnetization. The difference in magnetic behavior between PrFe 4 P 12 and PrRu 4 P 12 near their phase transitions is explained within a single framework. For the low-field phase of PrFe 4 P 12 , the scalar order with Γ 1 g symmetry can explain (i) the absence of field-induced dipoles perpendicular to the magnetic field, (ii) isotropic magnetic susceptibility in the ordered phase, (iii) the field-angle dependence of the transition temperature, and (iv) the splitting pattern of the 31 P nuclear magnetic resonance (NMR) spectra. It is proposed how the order parameter in SmRu 4 P 12 is identified by NMR analysis of a single crystal.
Physical Review B | 2005
Annamaria Kiss; Patrik Fazekas
Recent experiments on
Journal of the Physical Society of Japan | 2005
Annamaria Kiss; Yoshio Kuramoto
\mathrm{U}{\mathrm{Ru}}_{2}{\mathrm{Si}}_{2}
Physical Review B | 2003
Annamaria Kiss; P. Fazekas
show that the low-pressure hidden order is nonmagnetic but it breaks time reversal invariance. Restricting our attention to local order parameters of
Progress of Theoretical Physics Supplement | 2005
Yoshio Kuramoto; Junya Otsuki; Annamaria Kiss; Hiroaki Kusunose
5{f}^{2}
Journal of the Physical Society of Japan | 2008
Annamaria Kiss; Yoshio Kuramoto
shells, we find that the best candidate for hidden order is staggered order of either
Journal of the Physical Society of Japan | 2009
Annamaria Kiss; Yoshio Kuramoto
{\mathcal{T}}_{z}^{\ensuremath{\beta}}
Progress of Theoretical Physics Supplement | 2005
Patrik Fazekas; Annamaria Kiss; Katalin Radnóczi
or
Journal of the Physical Society of Japan | 2008
Annamaria Kiss; Yoshio Kuramoto
{\mathcal{T}}_{xyz}