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By W. A. Little (auth.), Vladimir Z. Kresin, William A. Little (eds.)

This publication comprises papers awarded on the foreign convention on natural Superconductivity which used to be held could 20-24, 1990, on the Stanford Sierra convention heart, South Lake Tahoe, California. within the 20 years because the First convention on natural Superconductivity used to be held (Hawaii, 1969), there was amazing development within the box. at this time, improvement is accelerating with contributions from many teams in lots of international locations around the world. the invention of excessive Tc superconductivity through G. Bednorz and okay. Muller in 1986 and next advancements within the ceramic superconductors have had a huge effect at the box of superconductivity as an entire. This discovery happened in a space solely varied from that of traditional superconduc­ tivity, underscoring the significance of the quest for and research of novel fabrics of every kind. We think that the organics, with their wide selection of structural, chemical, and actual homes, belong during this class of novel fabrics. This booklet displays the efforts of researchers from a number of disciplines: physicists, chemists, and fabrics scientists. It addresses the conventional and superconducting houses of natural fabrics, in addition to the quest for brand new compounds and new syntheses. we're happy to notice that the sort of papers studies at the discovery of a brand new natural superconductor with a checklist excessive Tc during this type. One bankruptcy is dedicated to a comparability of natural superconductors and the cuprates, one other, to the clients of studying different novel undertaking or superconducting compounds.

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H. M. Riseman 2, G. Saito3 ,4, and H. Yamochi 3 ,4 1. Department of Physics, Columbia University, New York, New York 10027, USA 2. , Canada 3. Department of Chemistry, Kyoto University, Kitashirakawa, Kyoto 606, Japan 4. Institute for Solid State Physics, University of Tokyo, Roppongi, Tokyo 106, Japan Muon Spin Relaxation (pSR) measurements on (BEDT - TTFhCu(NCSh show that the magnetic field penetration depth Abc within the conductive b-c plane is about 8000 A at T -+ O. This value corresponds to the superconducting carrier density n.

Lett. H. Brandt, Phys. Rev. B37, 2349 (1989). 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. These two papers give about 30 % different values for the constant a, resulting in 16 % difference in the absolute value of A. For consistency with our earlier papers, here we use the constant a derived by Pincus et al. after modifying it for the triangular lattice. R. , Phys. Rev. Lett. 64, 1293 (1990). The definition of (1 in this paper is different from the one in the present paper by a factor of",fi.

7 and Oshima et al. 5m. for the carriers in the b-c plane, which implies that the mean free path 1 = T X nkF/m* "" 500 A. A more conservative estimate of 1 can be made using conductivity results IIp = 7500n- 1cm- 1 just above Te (ref. 9) which provides a lower limit 1 ~ 200 A. Thus, we conclude that the present organic superconductor is close to the clean limit et 1 ~ 1. 6 X 10 19 /cm 3 from the relaxation rate O'(T -+ 0). 5me, the superconducting carrier density in this system becomes n. 2 X 1021 /cm3 expected if one carrier exists per formula unit.

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