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- Choi, J., et al.
(författare)
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Spatially inhomogeneous competition between superconductivity and the charge density wave in YBa2Cu3O6.67
- 2020
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Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 11:1
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Tidskriftsartikel (refereegranskat)abstract
- The charge density wave in the high-temperature superconductor YBa2Cu3O7−x (YBCO) has two different ordering tendencies differentiated by their c-axis correlations. These correspond to ferro- (F-CDW) and antiferro- (AF-CDW) couplings between CDWs in neighbouring CuO2 bilayers. This discovery has prompted several fundamental questions: how does superconductivity adjust to two competing orders and are either of these orders responsible for the electronic reconstruction? Here we use x-ray diffraction to study YBa2Cu3O6.67 as a function of magnetic field and temperature. We show that regions with F-CDW correlations suppress superconductivity more strongly than those with AF-CDW correlations. This implies that an inhomogeneous superconducting state exists, in which some regions show a fragile form of superconductivity. By comparison of F-CDW and AF-CDW correlation lengths, it is concluded that F-CDW ordering is sufficiently long-range to modify the electronic structure. Our study thus suggests that F-CDW correlations impact both the superconducting and normal state properties of YBCO.
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- Christenson, A., et al.
(författare)
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The Swedish Youth with Obesity cohort: Profile of an ongoing prospective study
- 2023
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Ingår i: Obesity. - 1930-7381. ; 31:6, s. 1678-1685
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Tidskriftsartikel (refereegranskat)abstract
- ObjectiveAs there is a lack of studies on adolescents and young adults with obesity, the Swedish Youth with Obesity cohort was set up to describe the long-term results of medical, as well as surgical, obesity interventions in youth. This article describes the study protocol. MethodsSince 2018, the study has continuously recruited patients aged between 16 and 25 years who have been admitted for obesity treatment at a specialist obesity clinic in Stockholm, Sweden. Participants provide data from blood tests, questionnaires, and anthropometric measurements. Data are collected longitudinally at enrollment and after 18 months and 3, 4, 5, and 10 years. ResultsIn the first 500 participants (76% female), the mean age was 21 (SD 3.0) years and the mean BMI was 41.3 (SD 6.1) kg/m(2) at enrollment. Almost half of the participants (44.4%) reported that both parents were born outside the Nordic countries. The proportion of participants who smoked at least sometimes was 28.4%. ConclusionsThe longitudinally collected data from the Swedish Youth with Obesity cohort will become a valuable source for answering various research questions regarding long-term results of medical and surgical obesity treatment in adolescents and young adults with obesity.
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- Felipe-Lucia, María R., et al.
(författare)
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Conceptualizing ecosystem services using social–ecological networks
- 2022
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Ingår i: Trends in Ecology & Evolution. - : Elsevier BV. - 0169-5347 .- 1872-8383. ; 37:3, s. 211-222
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Tidskriftsartikel (refereegranskat)abstract
- Social–ecological networks (SENs) represent the complex relationships between ecological and social systems and are a useful tool for analyzing and managing ecosystem services. However, mainstreaming the application of SENs in ecosystem service research has been hindered by a lack of clarity about how to match research questions to ecosystem service conceptualizations in SEN (i.e., as nodes, links, attributes, or emergent properties). Building from different disciplines, we propose a typology to represent ecosystem service in SENs and identify opportunities and challenges of using SENs in ecosystem service research. Our typology provides guidance for this growing field to improve research design and increase the breadth of questions that can be addressed with SEN to understand human–nature interdependencies in a changing world.
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