Physics
Resistivity and penetration depth measurements of organic superconductors in high magnetic fields using a tunnel diode oscillator
Document Type
Conference Proceeding
Abstract
We have made measurements of resistivity and penetration depth in dc-and pulsed-magnetic fields of the organic superconductors α-(ET)2NH4Hg(SCN)4 and κ-(ET)2Cu(NCS)2 using a resonant rf circuit powered by a tunnel diode oscillator (TDO). We compare the critical fields as measured by resistivity, and the TDO. All the superconductors we have studied have anisotropic critical fields with a ratio Hc2// to Hc2⊥ of 5-17. In κ-(ET)2Cu(NCS)2, we observed an almost monotonic increase in the parallel critical fields up to 24 T at 390 mK, and a sharp cusp in the critical field as a function of angle when the sample is parallel to the magnetic field. This suggests that the superconducting layers are only Josephson-coupled and the superconductivity is two-dimensional (2D). Another salt, α-(ET)2NH4HG(SCN)4, shows similar cusp behavior, but this material shows evidence of extreme Pauli limiting when the field is turned parallel to the conducting layers.
Publication Title
International Journal of Modern Physics B
Publication Date
8-30-2002
Volume
16
Issue
20-22
First Page
3227
Last Page
3232
ISSN
0217-9792
DOI
10.1142/s0217979202014048
Keywords
superconductivity, magnetic fields
Repository Citation
Agosta, C. C.; Coffey, T.; Bayindir, Z.; Mihut, I.; Martin, C.; and Tokumoto, M., "Resistivity and penetration depth measurements of organic superconductors in high magnetic fields using a tunnel diode oscillator" (2002). Physics. 35.
https://commons.clarku.edu/faculty_physics/35
Cross Post Location
Student Publications
