8,903 research outputs found
Muon localization site in U(Pt,Pd)3
The angular and temperature (10-250 K) variation of the Knight shift of
single-crystalline U(Pt0.95Pd0.05)3 has been measured in transverse field
(B=0.6 T) mSR experiments. By analysing the temperature variation of the Knight
shift with a modified Curie-Weiss expression the muon localization site in this
hexagonal material is determined at (0,0,0).Comment: 12 pages (including 4 figures); postscript file; Proc. 8th Int. Conf.
on Muon Spin Rotation, Relaxation and Resonance (Aug.30-Sept.3, Les
Diablerets); 2nd version with minor correction
High pressure transport study of non-Fermi liquid behaviour in U2Pt2In and U3Ni3Sn4
The strongly correlated metals U2Pt2In and U3Ni3Sn4 show pronounced non-Fermi
liquid (NFL) phenomena at ambient pressure. Here we review single-crystal
electrical resistivity measurements under pressure (p <= 1.8 GPa) conducted to
investigate the stability of the NFL phase. For tetragonal U2Pt2In (I||a) we
observe a rapid recovery of the Fermi-liquid T^2-term with pressure. The
Fermi-liquid temperature varies as T_FL ~ p-p_c, where p_c= 0 is a critical
pressure. The analysis within the magnetotransport theory of Rosch provides
evidence for the location of U2Pt2In at a zero pressure antiferromagnetic
quantum critical point (QCP). In the case of cubic U3Ni3Sn4 we find T_FL ~
(p-p_c)^1/2. The analysis provides evidence for an antiferromagnetic QCP in
U3Ni3Sn4 at a negative pressure p_c= -0.04+-0.04 GPa.Comment: 6 pages (4 figures); to appear in Proc. of Int. Conf. PPHMF-IV (20-25
Oct. 2001, Santa Fe
Young men's ambivalence toward alcohol
There is widespread concern about the health and social consequences of excessive alcohol consumption among young men. Interventions to reduce alcohol-related harm will be affected by ambivalence toward alcohol, because ambivalent attitudes are worse predictors of behaviour than are homogeneous attitudes. It is therefore important to identify aspects of alcohol consumption about which young men are not ambivalent. In-depth interviews were conducted with a socioeconomically diverse sample of 31 men, aged 18–21 living in London, UK. Ambivalence toward alcohol was widespread. None of the drinkers who were interviewed had uncomplicated positive evaluations of drinking: all mentioned compelling reasons not to drink. Most motives for drinking were also identified as reasons for not drinking if consumption became excessive. However, three motives for not drinking were not also motives for drinking: violence, alcoholism, and cost. These findings should be considered during the design of interventions to reduce the health and social consequences of excessive alcohol consumption amongst young men
Thermal bulk polymerization of cholesteryl acrylate
The thermal bulk polymerization of cholesteryl acrylate was carried out in the solid phase, the mesomorphic phase, and the liquid phase to study the effect of monomer ordering on polymerization rate and polymer properties. The rate increased with decreasing ordering (or enhanced mobility) of the monomer. Formation of inhibitive by-products during the polymerization limited conversions to 35%. The sedimentation constant S0 = 6.2 S was the same for the polymers obtained in the three phases. The weight-average molecular weight (w) was 480,000 as determined by ultracentrifugation. Poly-(cholesteryl acrylate) formed in bulk is randomly coiled when dissolved in tetrahydrofuran. The thermal properties of the monomer are given
Resistivity of non-Fermi liquid U2Pt2In under pressure
Non-Fermi liquid behaviour in single-crystalline U2Pt2In has been studied by
means of resistivity experiments (I||c) under hydrostatic pressure (P<1.5 GPa).
At ambient pressure the resistivity rho(T) follows a power law rho~T^alpha with
alpha~0.5. Upon applying pressure alpha increases. For P>1 GPa a minimum
develops in rho(T). A study of the field dependence of the minimum confirms its
magnetic origin. The ratio c/a is proposed as the effective control parameter,
rather than the unit cell volume.Comment: 5 pages (incl. 2 figures), submitted to SCES'99, Nagan
Type I superconductivity in the Dirac semimetal PdTe2
The superconductor PdTe was recently classified as a Type II Dirac
semimetal, and advocated to be an improved platform for topological
superconductivity. Here we report magnetic and transport measurements conducted
to determine the nature of the superconducting phase. Surprisingly, we find
that PdTe is a Type I superconductor with K and a critical
field mT. Our crystals also exhibit the intermediate
state as demonstrated by the differential paramagnetic effect. For we
observe superconductivity of the surface sheath. This calls for a close
examination of superconductivity in PdTe in view of the presence of
topological surface states.Comment: 5 page
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