1,548 research outputs found
Distinct behaviors of suppression to superconductivity in induced by Fe and Co dopants
In the superconductor LaRuSi with the Kagome lattice of Ru, we have
successfully doped the Ru with Fe and Co atoms. Contrasting behaviors of
suppression to superconductivity is discovered between the Fe and the Co
dopants: Fe-impurities can suppress the superconductivity completely at a
doping level of only 3%, while the superconductivity is suppressed slowly with
the Co dopants. A systematic magnetization measurements indicate that the doped
Fe impurities lead to spin-polarized electrons yielding magnetic moments with
the magnitude of 1.6 \ per Fe, while the electrons given by the Co
dopants have the same density of states for spin-up and spin-down leading to
much weaker magnetic moments. It is the strong local magnetic moments given by
the Fe-dopants that suppress the superconductivity. The band structure
calculation further supports this conclusion.Comment: 6 pages, 7 figure
Thermodynamics and phase transition in central charge criticality of charged Gauss-Bonnet AdS black holes
In this paper, we investigate the thermodynamics of D-dimensional charged
Gauss-Bonnet black holes in anti-de Sitter spacetime. Varying the cosmological
constant, Newton constant and Gauss-Bonnet coupling constant in the bulk, one
can rewrite the first law of thermodynamics for black holes. Furthermore, we
introduce the central charge and study the critical behaviors, which show the
apparent discrepancy from other black holes. Based on this approach, we
disclose the phase transition structures in , and . Besides, a
triple point where the small/intermediate/large black holes can coexist is
found in
DART-MPI: An MPI-based Implementation of a PGAS Runtime System
A Partitioned Global Address Space (PGAS) approach treats a distributed
system as if the memory were shared on a global level. Given such a global view
on memory, the user may program applications very much like shared memory
systems. This greatly simplifies the tasks of developing parallel applications,
because no explicit communication has to be specified in the program for data
exchange between different computing nodes. In this paper we present DART, a
runtime environment, which implements the PGAS paradigm on large-scale
high-performance computing clusters. A specific feature of our implementation
is the use of one-sided communication of the Message Passing Interface (MPI)
version 3 (i.e. MPI-3) as the underlying communication substrate. We evaluated
the performance of the implementation with several low-level kernels in order
to determine overheads and limitations in comparison to the underlying MPI-3.Comment: 11 pages, International Conference on Partitioned Global Address
Space Programming Models (PGAS14
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