Measuring radio frequency properties of materials in pulsed magnetic fields with a tunnel diode oscillator

2000 ◽  
Vol 71 (12) ◽  
pp. 4600 ◽  
Author(s):  
T. Coffey ◽  
Z. Bayindir ◽  
J. F. DeCarolis ◽  
M. Bennett ◽  
G. Esper ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Radio Frequency ◽  
Tunnel Diode ◽  
Pulsed Magnetic Fields ◽  
Diode Oscillator ◽  
Properties Of Materials ◽  
Frequency Properties ◽  
Tunnel Diode Oscillator

RESISTIVITY AND PENETRATION DEPTH MEASUREMENTS OF ORGANIC SUPERCONDUCTORS IN HIGH MAGNETIC FIELDS USING A TUNNEL DIODE OSCILLATOR

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3227-3232 ◽  
Author(s):  
C. C. AGOSTA ◽  
T. COFFEY ◽  
Z. BAYINDIR ◽  
I. MIHUT ◽  
C. MARTIN ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Penetration Depth ◽  
Tunnel Diode ◽  
Organic Superconductors ◽  
High Magnetic Fields ◽  
Pulsed Magnetic Fields ◽  
Critical Fields ◽  
Diode Oscillator ◽  
Tunnel Diode Oscillator ◽  
The Magnetic Field

We have made measurements of resistivity and penetration depth in dc-and pulsed-magnetic fields of the organic superconductors α- (ET) 2 NH 4 Hg(SCN) 4, and κ- (ET) 2 Cu(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 H c2 // to H c2 ⊥ of 5-17. In κ- (ET) 2 Cu(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) 2 NH 4 Hg(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.

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