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Title: Experimental studies in solid state and low temperature physics. Progress report, 1975

Abstract

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 lowmore » temperature heat capacity of bcc solid $sup 3$He is being studied. (auth)« less

Authors:
; ;
Publication Date:
Research Org.:
Minnesota Univ., Minneapolis (USA). School of Physics
Sponsoring Org.:
US Energy Research and Development Administration (ERDA)
OSTI Identifier:
4143378
Report Number(s):
COO-1569-132
NSA Number:
NSA-33-008431
DOE Contract Number:  
E(11-1)-1569
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 30-JUN-76
Country of Publication:
United States
Language:
English
Subject:
N66200* -Physics (Low Temperature)-Superconductivity; N62100 -Physics (Fluid)-Electrofluid Mechanics; 643900*; *HELIUM 3 B- VORTEX FLOW; *HELIUM II- VORTEX FLOW; *METALS- MAGNETISM; *SUPERCONDUCTORS- SPECIFIC HEAT; LIQUIDS; PRESSURE DEPENDENCE

Citation Formats

Goldman, A M, Weyhmann, W V, and Zimmermann, W Jr. Experimental studies in solid state and low temperature physics. Progress report, 1975. United States: N. p., 1975. Web. doi:10.2172/4143378.
Goldman, A M, Weyhmann, W V, & Zimmermann, W Jr. Experimental studies in solid state and low temperature physics. Progress report, 1975. United States. https://doi.org/10.2172/4143378
Goldman, A M, Weyhmann, W V, and Zimmermann, W Jr. 1975. "Experimental studies in solid state and low temperature physics. Progress report, 1975". United States. https://doi.org/10.2172/4143378. https://www.osti.gov/servlets/purl/4143378.
@article{osti_4143378,
title = {Experimental studies in solid state and low temperature physics. Progress report, 1975},
author = {Goldman, A M and Weyhmann, W V and Zimmermann, W Jr},
abstractNote = {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)},
doi = {10.2172/4143378},
url = {https://www.osti.gov/biblio/4143378}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1975},
month = {9}
}