414 research outputs found
Interplay of antiferromagnetism, ferromagnetism, and superconductivity in EuFe2(As1-xPx)2 single crystals
No full textWe report a systematic study of the influence of antiferromagnetic and ferromagnetic phases of Eu2+ moments on the superconducting phase upon doping the As site by isovalent P, which essentially acts like chemical pressure on EuFe2As2. Bulk superconductivity with transition temperatures of 22 and 28 K are observed for x = 0.16 and 0.20 samples, respectively. The Eu ions order antiferromagnetically for x = 0.22 whereupon the Eu ions order ferromagnetically and superconductivity is fully suppressed. Density-functional-theory-based calculations reproduce the observed experimental findings consistently. We discuss in detail the coexistence of superconductivity and magnetism in a tiny region of the phase space and comment on the competition of ferromagnetism and superconductivity in the title compound.DFG [SPP-1458
Electrical resistivity and specific heat of single-crystalline EuFe2As2: A magnetic homologue of SrFe2As2
No full textWe have grown single crystals of EuFe(2)As(2), and investigated its electrical transport and thermodynamic properties. Electrical resistivity and specific-heat measurements clearly establish the intrinsic nature of magnetic phase transitions at 20 and 195 K. While the high-temperature phase transition is associated with the itinerant moment of Fe, the low-temperature phase transition is due to magnetic order of localized Eu moments. Band-structure calculations point out a very close similarity of the electronic structure with SrFe(2)As(2). Magnetically, the Eu and Fe(2)As(2) sublattices are nearly decoupled.DFG Research Unit 960 and BRNS [2007/37/28
High-temperature superconductivity in Eu0.5K0.5Fe2As2
No full textEuFe(2)As(2) shows a spin-density wave (SDW) type transition at 190 K and antiferromagnetic (AF) order below 20 K. Here, we have studied the effect of K substitution on the SDW transition at high temperature and AF Eu order at low temperature. 50% K substitution suppresses the SDW transition and in turn gives rise to high-temperature superconductivity below T(c) = 32 K, as observed in the electrical resistivity, AC susceptibility, as well as magnetization. A well defined anomaly in the specific heat provides additional evidence for bulk superconductivity. Below 10 K, short-range magnetic order of the Eu moments is suggested by a broad feature in the specific-heat data. Electronic structure calculations reveal very close similarity with the nonmagnetic superconductor Sr(0.5)K(0.5)Fe(2)As(2), but yield localized 4f magnetic moments for the remaining Eu atoms.DFG Research Unit 960; BRNS [2007/37/28
Helge S. Kragh, Conceptions of Cosmos [Book Review]
No full textHelge S. Kragh, historian of science and prolific author of books (and a member of the editorial board
of this journal), has given us nothing less than a thorough history of cosmology, from biblical myths to
the present view of accelerated expansion. It’s a noble thing to try, and even if it isn’t always perfectly
accurate, Conceptions of Cosmos makes a real contribution to the literature
I remember life as an Estonian at Seabrook
No full textIn this "I remember" memoir, Helge Kangur recalls her Estonian upbringing at Seabrook. She realizes now how fortunate she was to grow up in such a diverse community. The Seabrook Educational and Cultural Center has been soliciting current and past residents of Seabrook Farms for an "I remember" project. Residents are asked to create narratives regarding their experiences at Seabrook Farms. These memories help preserve the history and multi-cultural heritage of Seabrook Farms
Conventional electronic structure of MgB2 and ZrB2: LDA vs. de Haas-v. Alphen & ARPES data
No full textWe compare full potential LDA band calculations of the Fermi surfaces areas and band masses of MgB2 and ZrB2 previously reported (1,3-5) and new dHvA data. Discrepancies in areas in MgB2 can be removed by a small shift of sigma bands relative to pi bands. Comparison of effective masses lead to orbit averaged el-ph coupling constants lambda(sigma)=1.3 and lambda(pi)=0.5, whereas for ZrB2 only weak el-ph coupling with lambda < 0.3 is found. The ARPES data(6) can be also well described by the LDA showing the presence of surface states
Renaissancen og middelalderen som periodiseringsbegreber:et essay
No full textThe essay discusses the traditional and the occasionally exaggerated use of periodisations in general historical studies. The terms 'the Middle Ages' and 'the Renaissance' have had very long and complicated histories of their own. Of the two terms "the Middle Ages", which was originally a pejorative expression, has appeared to be the strongest of the two, whereas the term 'the Renaissance' has had a much more chaotic history in historiography. During the last 150 years of historical writing and thinking it has gone from the highest success (due to Burchardt 1861) to the deepest downfall (around 1930). The author argues for the preservation of the term 'the Renaissance' for three reasons: (1) The period of the Renaissance coincides with the emergence of the modern, strong power state (from the 14th and 15th centuries onwards) in contrast to the medieval, decentralized, feudal political system, (2) the break-through of the secularisation of science, the humanities, culture and art (during the 15th and 16th centuries), and not in the least (3) the new consciousness of history (the here and now concept!), which arose in Italy in the 15th century, and which broke the millennial, traditional Christian explanation of the course of history
Evidence for a reentrant superconducting state in EuFe2As2 under pressure
No full textWe studied the temperature-pressure phase diagram of EuFe2As2 by electrical resistivity measurements. The spin-density-wave transition at T-0 associated with the FeAs-layers is continuously suppressed with increasing pressure, while the antiferromagnetic ordering temperature of the Eu2+ moments seems to be nearly pressure independent up to 2.6 GPa. Above 2 GPa a sharp drop of the resistivity, rho(T), indicates the onset of superconductivity at T-c approximate to 29.5 K. Surprisingly, on further reducing the temperature, rho(T) is increasing again and exhibiting a maximum caused by the ordering of the Eu2+ moments, a behavior which is reminiscent of reentrant superconductivity as it is observed in the ternary Chevrel phases or in the rare-earth nickel borocarbides
Fitness-AQA Dataset
No full textLargest Fine-grained Exercise Action Quality Assessment Dataset.
Dataset available from the following webpage: https://github.com/ParitoshParmar/Fitness-AQA.
If you find our work useful, please consider citing our ECCV 2022 conference paper that can be found at:
https://link.springer.com/chapter/10.1007/978-3-031-19839-7_7
or
https://arxiv.org/abs/2202.14019
Bibtex file:
@article{parmar2022domain,
title={Domain Knowledge-Informed Self-Supervised Representations for Workout Form Assessment},
author={Parmar, Paritosh and Gharat, Amol and Rhodin, Helge},
journal={arXiv preprint arXiv:2202.14019},
year={2022}
}Only available for non-commercial purposes. Users agree to terms and conditions of usage
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