منابع مشابه
First-order superconducting transition near a ferromagnetic quantum critical point.
We address the issue of how triplet superconductivity emerges in an electronic system near a ferromagnetic quantum critical point (FQCP). Previous studies found that the superconducting transition is of second order, and T(c) is strongly reduced near the FQCP due to pair-breaking effects from thermal spin fluctuations. In contrast, we demonstrate that near the FQCP, the system avoids pair-break...
متن کاملGraphene based superconducting quantum point contacts
We investigate the Josephson effect in the graphene nanoribbons of length L smaller than the superconducting coherence length and an arbitrary width W . We find that in contrast to an ordinary superconducting quantum point contact (SQPC) the critical supercurrent Ic is not quantized for the nanoribbons with smooth and armchair edges. For a low concentration of the carriers Ic decreases monotoni...
متن کاملAdiabatic dynamics of superconducting quantum point contacts.
Starting from the quasiclassical equations for non-equilibrium Green's functions we derive a simple kinetic equation that governs ac Josephson effect in a superconducting quantum point contact at small bias voltages. In contrast to existing approaches the kinetic equation is valid for voltages with arbitrary time dependence. We use this equation to calculate frequency-dependent linear conductan...
متن کاملConduction channels of superconducting quantum point contacts
Atomic quantum point contacts accommodate a small number of conduction channels. Their number N and transmission coe$cients M1 n N can be determined by analyzing the subgap structure due to multiple Andreev re#ections in the current}voltage (I}<) characteristics in the superconducting state. With the help of mechanically controllable break-junctions we have produced Al contacts consisting of a ...
متن کاملFluctuations in a superconducting quantum critical point of multi-band metals.
In multi-band metals quasi-particles arising from different atomic orbitals coexist at a common Fermi surface. Superconductivity in these materials may appear due to interactions within a band (intra-band) or among the distinct metallic bands (inter-band). Here we consider the suppression of superconductivity in the intra-band case due to hybridization. The fluctuations at the superconducting q...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1997
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.79.3752