352 research outputs found
Superconducting properties of the hole-doped three-band \emph{d-p} model studied with minimal-size real-space \emph{d}-wave pairing operators
The three-band \emph{d-p} model is investigated by means of Variational
Monte-Carlo (VMC) method with the BCS-like wave-function supplemented by the
Gutzwiller and Jastrow correlators. The VMC optimization leads to -
superconducting state with a characteristic dome-like shape of the order
parameter for hole doping , in a good agreement with the
experimental observations. Also, the off-diagonal pair-pair correlation
functions, calculated within VMC, vindicates the results obtained very recently
within the diagrammatic expansion of the Gutzwiller wave function method
(DE-GWF) [cf. Phys. Rev. B \textbf{99}, 104511 (2019)]. Subsequently, the
nature of the - pairing is investigated by means of recently proposed
\emph{minimal-size real-space d-wave pairing operators} [Phys. Rev. B
\textbf{100}, 214502 (2019)]. An emergence of the long-range superconducting
ordering for both and orbitals is reported by analysing the
corresponding off-diagonal pair-pair correlation functions. The dominant
character of \emph{d-wave} pairing on orbitals is confirmed. Additionally,
the trial wave-function is used to investigate the magnetic properties of the
system. The analysis of spin-spin correlation functions is carried out and
shows antiferromagnetic , short-range order, as expected.
For the sake of completeness, the charge gap has been estimated, which for the
parent compound takes the value , and
agrees with values reported experimentally for the cuprates
Methods of risk analysis of telematic objels
The paper focuses on basic description of the tunnel as a telematic object and its architecture. Conventional
methods of risk analysis of telematic objects are introduced in relation to their safety. New approaches of risk quantification
are shown in connection to existing legislation and directives of European Commission
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