Studies on highly anisotropic conductors and superconductors in high magnetic fields and low temperatures
Transport properties in high magnetic fields and at low temperatures were studied in a number of highly anisotropic organic superconductors and high-{Tc} cuprate superconductors. The magnetothermopower of (TMTSF){sub 2}ClO{sub 4} was systematically studied through the entire range of magnetic-field-induced spin-density-wave (FISDW) transitions. The data provide strong evidence of the collective nature of the extremely stable state between 8 to 25 Tesla resembling the 1/3 fractional quantized Hall effect. A new phase transition into a semiconducting state at 2.6K in a field of 30 Tesla was identified. The FISDW phase diagram in the field range of 15-18 Tesla was studied in detail to sort out the relationship between the fast oscillations (FO) and the reentrant FISDW. The study shows that there are no oscillations in the phase boundary correlated to the FO, in contrast to a theory proposed by Lebed and Bak. Transport properties of the high-{Tc} superconductors were systematically studied. The temperature and carrier concentration dependence of the thermopower suggested that the suprates were strongly correlated systems.
- Research Organization:
- Pennsylvania Univ., Philadelphia, PA (United States)
- OSTI ID:
- 5633394
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
CHARGE TRANSPORT
COPPER COMPOUNDS
CUPRATES
HETEROCYCLIC COMPOUNDS
HIGH-TC SUPERCONDUCTORS
MAGNETO-THERMAL EFFECTS
ORGANIC COMPOUNDS
ORGANIC SUPERCONDUCTORS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SELENIUM COMPOUNDS
SPIN WAVES
SUPERCONDUCTORS
TEMPERATURE EFFECTS
TMTSF
TRANSITION ELEMENT COMPOUNDS