Far-infrared studies on superconductors and heat-capacity studies on liquid crystals. Final report
Technical Report
·
OSTI ID:5627807
Low temperature (2.6 K < T < 30 K) heat-capacity measurements on one transforming V/sub 3/Si sample show that the electronic heat capacity in the superconducting state is well characterized by the weak-coupling BCS theory. Preliminary characterization of one doped /sup 3/He-cooled-Ge-bolometer for far infrared radiation gave resistance approx. = 3 x 10/sup 6/ ..cap omega.. and sensitivity approx. = 1 x 10/sup 6/ V/W at 0.43 K. Finally, one quasi-adiabatic calorimeter with high resolution and versatility has been built for studying phase transitions between the mesophases in liquid crystals which have low thermal conductivity. Heat-capacity studies have been carried out in two important continuous phase transitions, i.e., smectic A (SmA) - hexatic B and SmA - smectic C (SmC). A phase with hexatic type of ordering was first found in one liquid crystal mesophase, i.e., hexatic B. Unfortunately our results on the continuous SmA-hexatic B transition lead to large critical exponents associated with heat capacity anomaly and cannot be explained by the existing theories. On the other hand, our results on one continuous SmA-SmC transition indicated the importance of retaining sixth order in the mean-field Landau free energy expansion. Our observation resolves many controversial conclusions related to the nature of SmA-SmC transition.
- Research Organization:
- Minnesota Univ., Minneapolis (USA). School of Physics and Astronomy
- DOE Contract Number:
- AC02-79ER10461
- OSTI ID:
- 5627807
- Report Number(s):
- DOE/ER/10461-10; ON: DE84001123
- Country of Publication:
- United States
- Language:
- English
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Thu Sep 15 00:00:00 EDT 1983
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Far-infrared studies on superconductors and heat-capacity studies on liquid crystals. Progress report, February 19, 1981-March 30, 1982
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·
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Heat-capacity study of phase transitions in the liquid-crystal racemic 4-(2'-methylbutyl)phenyl-4'-n-nonyloxybiphenyl-4-carboxylate (2M4P9OBC)
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Sun May 01 00:00:00 EDT 1983
· Phys. Rev. A; (United States)
·
OSTI ID:6923715
Related Subjects
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC SPECIFIC HEAT
FLUIDS
LIQUID CRYSTALS
LIQUIDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SILICIDES
SILICON COMPOUNDS
SPECIFIC HEAT
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM SILICIDES
360603* -- Materials-- Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC SPECIFIC HEAT
FLUIDS
LIQUID CRYSTALS
LIQUIDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SILICIDES
SILICON COMPOUNDS
SPECIFIC HEAT
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM SILICIDES