75 research outputs found
Magnetic ordering in ErFe6Sn6
No full textWe have determined the magnetic structures of the Er and Fe sublattices in ErFe6Sn6 by high-resolution neutron powder diffraction and Mossbauer spectroscopy on the Er-166, Fe-57 and Sn-119 isotopes. The crystal space group is orthorhombic Cmcm. The Fe sublattice is antiferromagnetic with a Neel temperature of 560(5) K and it orders along the [100] direction with a magnetic space group C(p)m'c'm' and a propagation vector [010]. The Fe magnetic moment at 1.5 K is 2.4 +/- 0.6 mu(B). The Er sublattice orders independently of the Fe sublattice at 4.8 +/- 0.4 K and comprises a ferromagnetic mode along [100] and an antiferromagnetic mode along [010], with a propagation vector [0 1/2 0] i.e. cell-doubling along [010]. The magnetic space group of the Er sublattice within the magnetic unit cell is Pbc'm', a subgroup of Cmcm. At 1.5 K the ferromagnetic and antiferromagnetic components of the Er3+ magnetic moment (determined by a combination of neutron diffraction and magnetization measurements) are 5.9 +/- 0.1 and 4.9 +/- 1.5 mu(B), respectively, yielding a net Er moment of 7.7 1.5 AB. The Er3+ magnetic moment derived from Er-166 Mossbauer spectroscopy is 8.5 (1) mu(B)
Henri Temianka Correspondence; (cadogan)
No full textThis collection contains material pertaining to the life, career, and activities of Henri Temianka, violin virtuoso, conductor, music teacher, and author. Materials include correspondence, concert programs and flyers, music scores, photographs, and books.https://digitalcommons.chapman.edu/temianka_correspondence/1524/thumbnail.jp
Magnetic order in R2Ni17 intermetallics: a neutron-diffraction investigation
No full textThe crystal and magnetic structures of hexagonal intermetallic compounds of the type R2Ni17 with R = Y, Tb, Dy, Ho and Er have been investigated by neutron powder diffraction at 20 and 200 K. The crystal structures at 200 K, which is above the magnetic ordering temperature for these compounds, have been refined and show that they crystallize in the hexagonal Th2Ni17 structure (space group P6(3)/mmc). The magnetic structure at 20 K has a magnetic propagation vector (k) over right arrow = 0 and consists of a ferrimagnetic alignment of R and Ni moments. At 20 K, compounds with R = Tb, Dy and Ho are collinear ferrimagnets with moments aligned in the basal plane of the hexagonal unit cell, whilst the compound with R = Er is an axial collinear ferrimagnet. The low-temperature magnitudes of the R moments at 2b and 2d sites are markedly different, with an almost free ion value at the 2b site, whilst the 2d site moment is substantially reduced from its free ion value. (C) 2002 Elsevier Science B.V. All rights reserved
comments on Cadogan and Lee
No full textHenseler, J., & Schuberth, F. (2023). Partial least squares as a tool for scientific inquiry: comments on Cadogan and Lee. European Journal Of Marketing, 57(6), 1737-1757. https://doi.org/10.1108/EJM-06-2021-0416 --- %ABS3% ---Funding Information: Additionally, the first author gratefully acknowledges financial support from FCT Fundação para a Ciência e a Tecnologia (Portugal), national funding through a research grant from the Information Management Research Center – MagIC/NOVA IMS (UIDB/04152/2020). The first author also acknowledges a financial interest in the composite-based SEM software ADANCO and its distributor, Composite Modeling.Abstract Purpose In their paper titled “A Miracle of Measurement or Accidental Constructivism? How PLS Subverts the Realist Search for Truth,” Cadogan and Lee (2022) cast serious doubt on PLS’s suitability for scientific studies. The purpose of this commentary is to discuss the claims of Cadogan and Lee, correct some inaccuracies, and derive recommendations for researchers using structural equation models. Design/methodology/approach This paper uses scenario analysis to show which estimators are appropriate for reflective measurement models and composite models, and formulates the statistical model that underlies PLS Mode A. It also contrasts two different perspectives: PLS as an estimator for structural equation models vs. PLS-SEM as an overarching framework with a sui generis logic. Findings There are different variants of PLS, which include PLS, consistent PLS, PLSe1, PLSe2, proposed ordinal PLS and robust PLS, each of which serves a particular purpose. All of these are appropriate for scientific inquiry if applied properly. It is not PLS that subverts the realist search for truth, but some proponents of a framework called “PLS-SEM.” These proponents redefine the term “reflective measurement,” argue against the assessment of model fit and suggest that researchers could obtain “confirmation” for their model. Research limitations/implications Researchers should be more conscious, open and respectful regarding different research paradigms. Practical implications Researchers should select a statistical model that adequately represents their theory, not necessarily a common factor model, and formulate their model explicitly. Particularly for instrumentalists, pragmatists and constructivists, the composite model appears promising. Researchers should be concerned about their estimator’s properties, not about whether it is called “PLS.” Further, researchers should critically evaluate their model, not seek confirmation or blindly believe in its value. Originality/value This paper critically appraises Cadogan and Lee (2022) and reminds researchers who wish to use structural equation modeling, particularly PLS, for their statistical analysis, of some important scientific principles.publishersversionpublishe
Coexistence of long-ranged magnetic order and superconductivity in the pnictide superconductor SmFeAsO(1-x)F(x) (x=0, 0.15)
No full textPowder neutron-diffraction measurements on both SmFeAsO and the fluorine-doped superconductor,
SmFeAsO0.85F0.15, show that the Sm sublattice orders magnetically. In both cases we observe a simple layered
antiferromagnetic arrangement of the 0.5B Sm moments. This provides direct evidence that long-ranged
magnetic order of the samarium moments coexists with superconductivity in the SmFeAsO1−xFx system
A revised magnetic phase diagram for Fe<sub>x</sub>Mn<sub>5-x</sub>Si<sub>3</sub>
No full textThe magnetic and crystal structures of the series FexMn5-xSi3 (x=4,3.5,3,2,1) have been reinvestigated by neutron powder diffraction between 315 and 8 K. Fe atoms are found to preferentially occupy the 4d site of the hexagonal D8(8) structure (P6(3)/mcm). The compound Fe4MnSi3 orders ferromagnetically below 300 K. Refinement of the neutron data for this compound indicates that the moments are aligned at similar to40degrees off the c axis. A high moment at the 6g site is due to a large Mn moment which is forced into a ferromagnetic alignment with the Fe moments. Associated with this moment is a moderate magnetic entropy change, with a maximum value of 4 J kg-1 K-1 for a magnetic field change of 5 T. The magnetic structure of Fe3.5Mn1.5Si3 is similar to that of Fe4MnSi3, but the Curie point is lower, below 240 K. A feature for this composition is the appearance of a spiral structure below 60 K. The compounds with x=1, 2, and 3 are all antiferromagnets with a spiral structure observed for Fe3Mn2Si3 at all temperatures up to the Neel point of 150 K. Two separate antiferromagnetic structures exist for Fe2Mn3Si3, one between 120 and 45 K and another structure for temperatures below 45 K. Similar features in the magnetic ordering are exhibited by FeMn4Si3. At temperatures between 70 and 95 K, the magnetic structure is similar to that of the low temperature phase of Fe2Mn3Si3. Accompanying the magnetic transition at 70 K is a structural distortion to space group Cmcm, a feature also observed for Mn5Si3
Dipole-field-induced spin disorder in a nanocomposite soft magnet
No full textpeer reviewedWe report on a study of a magnetic nanocomposite of the Nanoperm type (Fe89Zr7B3Cu1) by magnetic small-angle neutron scattering (SANS). The understanding of the magnetic microstructure of these materials leaves much to be desired since we lack techniques capable of resolving the spin structure in the bulk with nanoscale resolution. Here, we present an analysis of the SANS signal by which one cannot only characterise the nanoscale structure of the spin system, but which allows to identify origin and structure of the perturbing field. In Nanoperm, an unusual angular anisotropy of the scattering suggests that the local spin misalignment decorates, as the most important perturbing field, dipole stray fields around the crystalline phase of the composite
A search for field-induced ordering in the optimally doped Ba(Fe, Co)(2)As-2 superconductor
No full textA Fe-57 Mossbauer search for field-induced magnetic order in optimally doped Ba(Fe1-xCox)(2)As-2 in fields of up to 6 T showed no changes that could be attributed to field-induced order. We also observed no difference between the normal (30 K) and superconducting states (5 K). Any field-induced order is certainly less than 1% of the order present in the parent BaFe2As2.This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Quinn, Katherine, D. H. Ryan, P. C. Canfield, S. L. Bud'ko, and J. M. Cadogan. "A search for field-induced ordering in the optimally doped Ba (Fe, Co) 2 As 2 superconductor." Journal of Applied Physics 113, no. 17 (2013): 17E127, and may be found at DOI: 10.1063/1.4795421. Posted with permission.</p
Education in Europe: anything but uniform. Europe: Magazine of the European Community No. 329, September 1993
No full textThe Old Testament Source of Rev 21:3c
No full textThis paper intends an assessment of the textual form of Rev 21:3c as an OT reference; as such it may have something to contribute to the discussion commenced by Menken and continued by Schuchard on deciphering the form of the OT in the NT. Even though other aspects of Revelation study may be vital, the limitations of this research preclude more than the most cursory excursion, if any at all, into the ongoing dialogue on the use of the OT in the NT,language, style, authorship, unity, symbolism, the historical context of Revelation, or whether the author of the Gospel, the Epistles, and the Apocalypse are one and the same• Moreover, regrettably, textual references do not include the literature of either the Qumran community or the Pseudepigrapha but are limited to the MT, LXX, and other non-LXX texts of the Greek QT
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