Experimental studies in solid state and low temperature physics. Progress report, 1975
Experimental investigations are being carried out in a broad area of low- temperature and solid-state physics which includes superconductivity, magnetism in metals and liquid and solid helium. The pair-field susceptibility of superconductors is being studied. A propagating mode in the phase of the superconducting order parameter has been found. Heat capacities of superconducting films in the vicinity of T/sub c/ are also being investigated. An investigation in the time-dependent high conductivity of dilute solid solutions of sodium in ammonia has been initiated. Nuclear orientation studies of the dilute magnetic impurity problem in metals in the 1 mK temperature region are being carried out. Refrigeration requirements for this work are being met using enhanced hyperfine nuclear cooling. Measurements of the differential osmotic pressure of $sup 3$He/$sup 4$He liquid mixtures near the tricritical point have shown a peak in the ''concentration susceptibility'' at the lambda line. Data obey a simple tricritical scaling relation. The dynamics of superfluid flow through submicron pores are being studied in both pure $sup 4$He and in $sup 3$He/$sup 4$He mixtures in an apparatus provided with a $sup 3$He refrigerator. The quantization of circulation in superfluid liquid $sup 4$He is being investigated using the Vinen method. The low temperature heat capacity of bcc solid $sup 3$He is being studied. (auth)
- Research Organization:
- Minnesota Univ., Minneapolis (USA). School of Physics
- Sponsoring Organization:
- US Energy Research and Development Administration (ERDA)
- DOE Contract Number:
- E(11-1)-1569
- NSA Number:
- NSA-33-008431
- OSTI ID:
- 4143378
- Report Number(s):
- COO-1569-132
- Resource Relation:
- Other Information: Orig. Receipt Date: 30-JUN-76
- Country of Publication:
- United States
- Language:
- English
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