Insights Superconductivity

To gain some insight into this problem we focus here on the analysis of the Berry phase [1] in a weakly dissipative system. It is particularly timely to address this issue now given the recent experimental activities in realization of controlled quantum two-level systems (qubits), and in particular, the interest in observing a Berry phase (BP) (see, e.g., [5]). For instance, the superconducting qubits have a coupling to their environment, which is weak but not negligible [10, 15, 4], and thus it is important to find both the conditions under which the Berry phase can be observed and the nature of that Berry phase. 

The open issues mentioned here should legitimate the assumption that this class of compounds will provide further substantial and general insight into mechanisms of superconductivity and its interplay with magnetism. 

Some insight into holistic systems is gained by considering a collection of electrons that appear to flow together in a conductor without fusing into a continuous condensate, as in superconduction, each described by an individual wave function. The total wave function for this current is defined as a product function... 

Insight into the changes in the intramolecular bonding of C, on intercalation, and the relevance of the various vibrational modes to the mechanism of superconductivity, can be obtained by comparing the low-temperature INS spectra of K,C,> and Cm,. The striking difference between the two systems is the redistribution of intensity that occurs between the radial and tangential modes. Carbon-60 has intense features up to — 110 meV, followed by many weaker and broader hands up to... 

We have ako charactciized the temperature dqien ncx A in both K3C50 and RbgC since thk can provide additional insight into the mechanism of superconductivity. Representative nmrmalizai conductance carves recorded on K-aOjo and theoretical fits to these data for 4.2 K < T < are shown in Fig. 3. 

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