4,858 research outputs found
YBaCuO/LaCaMnO bilayers: Interface coupling and electric transport properties
Heteroepitaxially grown bilayers of ferromagnetic LaCaMnO
(LCMO) on top of superconducting YBaCuO (YBCO) thin films were
investigated by focusing on electric transport properties as well as on
magnetism and orbital occupation at the interface. Transport measurements on
YBCO single layers and on YBCO/LCMO bilayers, with different YBCO thickness
and constant LCMO thickness \,nm, show a significant reduction of
the superconducting transition temperature only for \,nm,with
only a slightly stronger suppression in the bilayers, as compared to the
single layers. X-ray magnetic circular dichroism (XMCD) measurements confirm
recently published data of an induced magnetic moment on the interfacial Cu by
the ferromagnetically ordered Mn ions, with antiparallel alignment between Cu
and Mn moments. However, we observe a significantely larger Cu moment than
previously reported, indicating stronger coupling between Cu and Mn at the
interface. This in turn could result in an interface with lower transparency,
and hence smaller spin diffusion length, that would explain our electric
transport data, i.e.smaller suppression. Moreover, linear dichroism
measurements did not show any evidence for orbital reconstruction at the
interface, indicating that a large change in orbital occupancies through
hybridization is not necessary to induce a measurable ferromagnetic moment on
the Cu atoms.Comment: 8 Figure
Superconductivity and hybrid soft modes in TiSe
The competition between superconductivity and other ground states of solids
is one of the challenging topics in condensed matter physics. Apart from
high-temperature superconductors [1,2] this interplay also plays a central role
in the layered transition-metal dichalcogenides, where superconductivity is
stabilized by suppressing charge-density-wave order to zero temperature by
intercalation [3] or applied pressure [4-7]. 1T-TiSe forms a prime example,
featuring superconducting domes on intercalation as well as under applied
pressure. Here, we present high energy-resolution inelastic x-ray scattering
measurements of the CDW soft phonon mode in intercalated CuTiSe and
pressurized 1T-TiSe along with detailed ab-initio calculations for the
lattice dynamical properties and phonon-mediated superconductivity. We find
that the intercalation-induced superconductivity can be explained by a solely
phonon-mediated pairing mechanism, while this is not possible for the
superconducting phase under pressure. We argue that a hybridization of phonon
and exciton modes in the pairing mechanism is necessary to explain the full
observed temperature-pressure-intercalation phase diagram. These results
indicate that 1T-TiSe under pressure is close to the elusive state of the
excitonic insulator
Pilot Study: Does the White Coat Influence Research Participation?
In health care, the white coat symbolizes professionalism, trustworthiness, and competence; it also represents power. This suggests that the wearing of a white coat could influence the decisions of potential subjects who are asked to participate in clinic-based research
A Pilot Survey on the Licensing of DNA Inventions
Despite ethical concerns about gene patents, virtually no empirical evidence exists to support claims about either positive or negative effects, and extremely little is known about the intellectual property protection strategies of firms and universities. This article discusses the results of a pilot study to examine patenting and licensing philosophies, policies, and practices of different types of institutions and to describe the contractual conditions for licensing DNA sequence inventions
The Timing of Daily Demand for Goods and Services - Multivariate Probit Estimates and Microsimulation Results for an Aged Population with German Time Use Diary Data
The Timing of Daily Demand for Goods and Services – Multivariate Probit Estimates and Microsimulation Results for an Aged Population with German Time Use Diary Data
Though consumption research provides a broad spectrum of theoretical and empirical founded results, studies based on a daily focus are missing. Knowledge about the individual timing of daily demand for goods and services, opens – beyond a genuine contribution to consumption research – interesting societal and macro economic as well as individual personal and firm perspectives: it is important for an efficient timely coordination of supply and demand in the timing perspective as well as for a targeted economic, social and societal policy for a better support of the every day coordination of life. Last not least, the individual daily public and private living situations will be visible, which are of particular importance for the social togetherness in family and society. Our study contributes to the timing of daily consumption for goods and services with an empirical founded microanalysis on the basis of more than 37.000 individual time use diaries of the nationwide Time Budget Survey of the German Federal Statistical Office 2001/02. We describe the individual timing of daily demand for goods and services for important socio-demographic groups like for women and men, the economic situation with income poverty and daily working hour arrangements. The multivariate microeconometric explanation of the daily demand for goods and services is based on a latent utility maximizing approach over a day. We estimate an eight equation Multivariate/Simultaneous Probit Model, which allows the decision for multiple consumption activities in more than one time period a day. The estimates quantify effects on the timing of daily demand by individual socio-economic variables, which encompasses, personal, household, regional characteristics as well as daily working hour arrangements within a flexible labour market.
The question about individual effects of an aged society on the timing of daily demand for goods and services is analyzed with our microsimulation model ServSim and a population forecast for 2020 by the German Federal Statistical Office. Main result: There are significant differences in explaining the timing of daily demand for goods compared to services on the one hand and in particular for different daily time periods.
The conclusion: without the timing aspects an important and significant dimension for understanding individual consumption behaviour and their impacts on other individual living conditions would be missing
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