By Research Fellow in Historical Linguistics Guy Deutscher
How new are the excessive Tc superconductors, compared to the normal low Tc ones? In what experience are those oxides assorted from normal metals of their basic country? How varied is the mechanism for top Tc superconductivity from the well known electron-phonon interplay that explains so good superconductivity in metals and alloys? What are the results of the hot positive aspects of the excessive Tc oxides for his or her sensible purposes? This booklet goals to provide a few solutions to these questions, drawing rather on similarities among the excessive Tc oxides and granular superconductors, which additionally current a greatest in their severe temperature close to the metal-insulator transition.
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Additional info for New superconductors: from granular to high Tc
5). 2 Nucleation field measurements Experimental methods for the determination of £ from nucleation field measurements are different for Type II and Type I superconductors. 3. 4: An over-coating of Cu quenches surface superconductivity on the outer side of a Pb film deposited on a dielectric cylinder. At H = Hc the field penetrates up to the inner surface tegument. The change in inductance is detected by an LC circuit. 400 0° 0/ /° 200 *< / / / • IO'A • •! 5: The change in the resonant frequency of the LC circuit at Hc measured as a function of the Pb film thickness extrapolates back to a finite value which is of the order of the coherence length.
G. A. , New York 1966). P. Burger and D. SaintJames, in "Superconductivity", Ed. D. Parks, M. , New York (1969), p. 977. 5. Further reading 41 For a review on coherence length effects, see G. Deutscher in "Encyclopedia on Superconductivity and Magnetism", Ed. Jan Evetts, Pergamon Press. K. V. Ramakrishnan, Physica C 282-287, 290 (1997); Y. 126, 23 (2003) and references therein, V. Emery and S. Kivelson, Nature 374, 434 (1995). Chapter 3 The phase transition The transition to the superconducting state belongs to the general class of second order phase transitions.
The former is of the order of ksTc, and the later of the order of ^ - or within numerical factors ksTc ( jP- J, where Tp is the Fermi temperature, Tp 3> Tc. One may be tempted to conclude that the BE condensed state is "stronger" 18 Superfluidity (for a given transition temperature) than the BCS state. This is in fact wrong: the BCS state is more rigid against fluctuations than the BE state. The reason is that the later has a much shorter coherence length (of the order of the inter-boson distance) than the former, and what actually determines fluctuation amplitudes is the condensation energy per coherence volume, rather than the condensation energy per boson.