부산대학교 도서관

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)