Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Grempel, Daniel"'
Autor:
Cugliandolo, Leticia F., Grempel, Daniel, Lozano, Gustavo, Lozza, Homero, Santos, Constantino da Silva
Publikováno v:
Phys. Rev. B66, 014444 (2002)
We discuss the behavior of a quantum glassy system coupled to a bath of quantum oscillators. We show that the system localizes in the absence of interactions when coupled to a subOhmic bath. When interactions are switched on localization disappears a
Externí odkaz:
http://arxiv.org/abs/cond-mat/0110497
Publikováno v:
Phys. Rev. Lett. 85, 2589 (2000).
We study the spin-glass transition in a disordered quantum model. There is a region in the phase diagram where quantum effects are small and the phase transition is second order, as in the classical case. In another region, quantum fluctuations drive
Externí odkaz:
http://arxiv.org/abs/cond-mat/0003268
Autor:
Aristov, Dmitry N., Grempel, Daniel R.
We study the spin fluctuation dynamics of Cu-O chains in the oxygen deficient planes of YBa(2)Cu(3)O(6+x). The chains are described by a model including antiferromagnetic interactions between the spins and Kondo-like scattering of the oxygen holes by
Externí odkaz:
http://arxiv.org/abs/cond-mat/9909081
Publikováno v:
Euorphys. Lett. 48 (1997) 699
We propose an indirect way of studying the fluctuation-dissipation relation in spin-glasses that only uses available susceptibility data. It is based on a dynamic extension of the Parisi-Toulouse approximation and a Curie-Weiss treatment of the avera
Externí odkaz:
http://arxiv.org/abs/cond-mat/9905330
Autor:
Burdin, Sebastien
Publikováno v:
Physique mathématique [math-ph]. Université Joseph-Fourier-Grenoble I, 2001. Français
Physique mathématique [math-ph]. Université Joseph-Fourier-Grenoble I, 2001. Français. ⟨NNT : ⟩
Physique mathématique [math-ph]. Université Joseph-Fourier-Grenoble I, 2001. Français. ⟨NNT : ⟩
This thesis revolves around a main subject : the theoretical study of the Kondo effect in heavy fermions when the magnetic impurity concentration is high. In the first part, the influence of the variation of the concentration of conducting electrons
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::ed4fe98688364407d6f010abaead7932
https://tel.archives-ouvertes.fr/tel-00000901
https://tel.archives-ouvertes.fr/tel-00000901