7,006 research outputs found
Marital Investments and Community Involvement: A Test of Coser’s Greedy Marriage Thesis
It is customary to test Coser’s greedy marriage thesis by comparing marital status groups. We propose a new approach that uses the marital dyad as the unit of analysis and examine whether investments in the marital relationship discourage community involvement through formal volunteering. Data from a U.S. national sample of 1,368 married couples revealed mixed support for the proposed relationship. Consistent with the greedy marriage thesis, wives’ soulmate view of marriage was negatively associated with their own and their husbands’ reports of volunteering. Although these associations were attenuated by religious service attendance, wives’ soulmate view had a more dampening effect than husbands’ soulmate view on their own and their husbands’ volunteering. However, the time couples spend alone together was positively associated with husbands’ reports of volunteering, which counters the greedy marriage thesis. These findings suggest that the greedy nature of marriage is, in part, determined by its participants—how they define and manage their marriage
Hidden and antiferromagnetic order as a rank-5 superspin in URu2Si2
We propose a candidate for the hidden order in URu2Si2: a rank-5 E type spin
density wave between Uranium 5f crystal field doublets breaking time reversal
and lattice tetragonal symmetry in a manner consistent with recent torque
measurements [R. Okazaki et al, Science 331, 439 (2011)]. We argue that
coupling of this order parameter to magnetic probes can be hidden by crystal
field effects, while still having significant effects on transport,
thermodynamics and magnetic susceptibilities. In a simple tight-binding model
for the heavy quasiparticles, we show the connection between the hidden order
and antiferromagnetic phases arises since they form different components of
this single rank-5 pseudo-spin vector. Using a phenomenological theory, we show
the experimental pressure-temperature phase diagram can be qualitatively
reproduced by tuning terms which break pseudo-spin rotational symmetry. As a
test of our proposal, we predict the presence of small magnetic moments in the
basal plane oriented in the [110] direction ordered at the wave-vector (0,0,1).Comment: 5 page
On the cohomology of hyperkahler quotients
This paper gives a partial desingularisation construction for hyperk\"ahler
quotients and a criterion for the surjectivity of an analogue of the Kirwan map
to the cohomology of hyperk\"ahler quotients. This criterion is applied to some
linear actions on hyperk\"ahler vector spaces.Comment: 21 pages. Final versio
Superlattice-induced ferroelectricity in charge-ordered LaSrFeO
Charge-order-driven ferroelectrics are an emerging class of functional
materials, distinct from conventional ferroelectrics, where electron-dominated
switching can occur at high frequency. Despite their promise, only a few
systems exhibiting this behavior have been experimentally realized thus far,
motivating the need for new materials. Here, we use density functional theory
to study the effect of artificial structuring on mixed-valence solid-solution
LaSrFeO (LSFO), a system well-studied experimentally. Our
calculations show that A-site cation (111)-layered LSFO exhibits a
ferroelectric charge-ordered phase in which inversion symmetry is broken by
changing the registry of the charge order with respect to the superlattice
layering. The phase is energetically degenerate with a ground-state
centrosymmetric phase, and the computed switching polarization is 39
C/cm, a significant value arising from electron transfer between Fe
ions. Our calculations reveal that artificial structuring of LSFO and other
mixed valence oxides with robust charge ordering in the solid solution phase
can lead to charge-order-induced ferroelectricity
From the Editor
Those most in need of knowledge about hemp face a dearth of rigorously-tested, scientifically grounded, and peer-reviewed knowledge. This describes the need that the Journal of Agricultural Hemp Research (JAHR) strives to satisfy. This special editorial introduces the JAHR, previews the contents of its inaugural issue, and delivers its dedication
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