9,341 research outputs found
T/B scaling without quasiparticle mass divergence: YbCo2Ge4
YbCoGe is a clean paramagnetic Kondo lattice which displays non-Fermi
liquid behavior. We report a detailed investigation of the specific heat,
magnetic Gr\"uneisen parameter () and temperature derivative
of the magnetization () on a high-quality single crystal at temperatures
down to ~K and magnetic fields up to 7~T. and
display a divergence upon cooling and obey scaling. Similar behavior has
previously been found in several other Yb-based Kondo lattices and related to a
zero-field quantum critical point without fine tuning of pressure or
composition. However, in the approach of the electronic heat
capacity coefficient of YbCoGe saturates at low , excluding
ferromagnetic quantum criticality. This indicates that scaling is
insufficient to prove a zero-field quantum critical point.Comment: 6 pages, 6 figures (including supplemental material
An investigation of children's peer trust across culture: is the composition of peer trust universal?
The components of children's trust in same-gender peers (trust beliefs, ascribed trustworthiness, and dyadic reciprocal trust) were examined in samples of 8- to 11-year-olds from the UK, Italy, and Japan. Trust was assessed by children's ratings of the extent to which same-gender classmates kept promises and kept secrets. Social relations analyses confirmed that children from each country showed significant: (a) actor variance demonstrating reliable individual differences in trust beliefs, (b) partner variance demonstrating reliable individual differences in ascribed trustworthiness, and (c ) relationship variance demonstrating unique relationships between interaction partners. Cultural differences in trust beliefs and ascribed trustworthiness also emerged and these differences were attributed to the tendency for children from cultures that value societal goals to share personal information with the peer group
High-dimensional graphical networks of self-avoiding walks
We use the lace expansion to analyse networks of mutually-avoiding self-avoiding walks, having the topology of a graph. The networks are defined in terms of spread-out self-avoiding walks that are permitted to take large steps. We study the asymptotic behaviour of networks in the limit of widely separated network branch points, and prove Gaussian behaviour for su#ciently spread-out networks on in dimensions d>4
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