Zobrazeno 1 - 10
of 639
pro vyhledávání: '"Doniach S"'
Autor:
Watanabe, H., Doniach, S.
We present the results of numerical studies of superconductivity and antiferromagnetism in a strongly correlated electron system. To do this we construct a Hubbard model on a lattice of self-consistently embedded multi-site clusters by means of a dyn
Externí odkaz:
http://arxiv.org/abs/cond-mat/0205086
Autor:
Schroeter, D. F., Doniach, S.
Publikováno v:
Phys. Rev. B 66, 075120 (2002)
We propose that the pseudogap state observed in the transition metal oxides can be explained by a three-dimensional flux state, which exhibits spontaneously generated currents in its ground state due to electron-electron correlations. We compare the
Externí odkaz:
http://arxiv.org/abs/cond-mat/0201524
Autor:
Das, D., Doniach, S.
Publikováno v:
Phys. Rev. B 64, 134511 (2001)
In this paper, we extend our previous discussion of the Bose metal to the field tuned case. We point out that the recent observation of the metallic state as an intermediate phase between the superconductor and the insulator in the field tuned experi
Externí odkaz:
http://arxiv.org/abs/cond-mat/0102442
The large flux-flow velocity behavior of the high temperature superconductor BSCCO in the mixed state is studied by measurement of the current-voltage characteristic as a function of temperature and magnetic field direction. We find strong evidence f
Externí odkaz:
http://arxiv.org/abs/cond-mat/0007479
Autor:
Das, D., Doniach, S.
Publikováno v:
Phys. Rev. B 60, 1261 (1999)
This paper aims to justify, at a microscopic level, the existence of a two-dimensional Bose metal, i.e. a metallic phase made out of Cooper pairs at T=0. To this end, we consider the physics of quantum phase fluctuations in (granular) superconductors
Externí odkaz:
http://arxiv.org/abs/cond-mat/9902308
Autor:
Krämer, A., Doniach, S.
Using path-integral Quantum Monte Carlo we study the low-temperature phase diagram of a two-dimensional superconductor within a phenomenological model, where vortices have a finite mass and move in a dissipative environment modeled by a Caldeira-Legg
Externí odkaz:
http://arxiv.org/abs/cond-mat/9809337
Autor:
Das, D., Doniach, S.
Publikováno v:
Phys. Rev. B vol. 57, 14440(1998).
In this paper, we argue that, in 2-d, the weak localisation of bosons, which occurs on the insulating side of the superconductor-insulator transition, is characterised by $\rho \sim ln(1/T)$, as compared to $\sigma \sim lnT$ for fermions. Such an unc
Externí odkaz:
http://arxiv.org/abs/cond-mat/9803345
Using Langevin dynamics, we have investigated the dynamics of vortices in a disordered two dimensional superconductor subjected to a uniform driving current. The results provide direct numerical evidence for a dynamical phase transition between a pla
Externí odkaz:
http://arxiv.org/abs/cond-mat/9606126
We show that the flux line lattice in a model layered HTSC becomes unstable above a critical magnetic field with respect to a plastic deformation via penetration of pairs of point-like disclination defects. The instability is characterized by the com
Externí odkaz:
http://arxiv.org/abs/cond-mat/9604171
We consider a lattice model of a semiflexible homopolymer chain in a bad solvent. Beside the temperature $T$, this model is described by (i) a curvature energy $\varepsilon_h$, representing the stiffness of the chain (ii) a nearest-neighbour attracti
Externí odkaz:
http://arxiv.org/abs/cond-mat/9512058