Accession Number : ADA307661

Title :   High and Ultra High Magnetic Field Studies of Newly Synthesized Organic Superconductors.

Descriptive Note : Final rept. 30 Sep 92-29 Sep 95,

Corporate Author : CLARK UNIV WORCESTER MA

Personal Author(s) : Agosta, C. C.

PDF Url : ADA307661

Report Date : 29 SEP 1995

Pagination or Media Count : 5

Abstract : To understand the nature of the superconducting state, we studied the new organic superconductor (BETS)2GaCl4, that was synthesized by our collaborator L. K. Montgomery. The BETS donor molecule is a variant of the BEDT molecule where four of the inner sulfur atoms are replaced with selenium atoms. The larger selenium atoms produce a larger overlap of the orbitals in the conducting sheets of the crystals and hence produce wider electronic bands. We used RF penetration depth measurements at 24 MHz initially to map out the H sub c2 diagram of (BETS)2GaCl4. The measurements were much more successful than we expected yielding many details about the superconducting state and the vortex lattice. As an example, we were able to measure the pinning force potential, often called the Labush parameter, as a function of temperature from 100 mK to 4.5 K. Knowing this parameter enabled us to calculate a critical current at zero temperature of 2 x 10(exp 4) A/sq cm for this material.

Descriptors :   *MAGNETIC FIELDS, *SUPERCONDUCTORS, *ORGANIC MATERIALS, ELECTRONICS, MEASUREMENT, SYNTHESIS, MOLECULES, CRYSTALS, ATOMS, VORTICES, ATOMIC ORBITALS, PENETRATION, INTERNAL, SHEETS, CHLORIDES, GALLIUM, SULFUR, RADIOFREQUENCY, SELENIUM.

Subject Categories : Organic Chemistry
      Electrical and Electronic Equipment
      Electricity and Magnetism
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE