Results 1 to 10 of about 666,938 (405)

Competing Orders in FeAs Layers [PDF]

Physical Review Letters, 2008
Using the unrestricted Hartree-Fock approximation and Landau theory we identify possible phases competing with superconductivity in FeAs layers. We find that close to half-filling the transition from the paramagnet to the magnetically ordered phase is first-order making anharmonicities relevant and leading to a rich phase diagram.
Lorenzana J, Seibold G, Ortix C, Grilli M   +3 more
openaire   +9 more sources

Quasiparticle Band Structure and Density Functional Theory: Single-Particle Excitations and Band Gaps in Lattice Models [PDF]

, 1999
We compare the quasiparticle band structure for a model insulator obtained from the fluctuation exchange approximation (FEA) with the eigenvalues of the corresponding density functional theory (DFT) and local density approximation (LDA). The discontinuity in the exchange-correlation potential for this model is small and the FEA and DFT band structures ...
C. De Dominicis, D. W. Hess, D. W. Hess, G. Baym, H. J. Shulz, H. J. Vidberg, J. J. Deisz, J. J. Deisz, J. M. Luttinger, J. P. Perdew, J. P. Perdew, J. W. Serene, J. W. Serene, K. Takegahara, L. J. Sham, L. J. Sham, L. J. Sham, L. J. Sham, L. J. Sham, N. D. Mermin, N. E. Bickers, O. Gunnarsson, P. Hohenberg, R. O. Jones, R. W. Godby, W. E. Pickett, W. Knorr, W. Kohn, W. P. Su   +28 more
arxiv   +3 more sources

MuSR studies of RE(O,F)FeAs (RE = La, Nd, Ce) and LaOFeP systems: possible incommensurate/stripe magnetism and superfluid density [PDF]

Phys. Rev. Lett. 102, 087001 (2009), 2008
Muon spin relaxation (MuSR) measurements in iron oxy-pnictide systems have revealed: (1) commensurate long-range order in undoped LaOFeAs; (2) Bessel function line shape in La(O0.97F0.03)FeAs which indicates possible incommensurate or stripe magnetism; (3) anomalous weak magnetism existing in superconducting LaOFeP, Ce(O0.84F0.16)FeAs, and Nd(O0.88F0 ...
J. P. Carlo, Y. J. Uemura, T. Goko, G. J. MacDougall, J. A. Rodriguez‐Rivera, Weiqiang Yu, G. M. Luke, Pengcheng Dai, Nic Shannon, S. Miyasaka, Shigenori Suzuki, S. Tajima, Genfu Chen, W. Z. Hu, J. L. Luo, N. L. Wang   +15 more
arxiv   +3 more sources

Raman spectra in iron-based quaternary CeO$_{1-x}$F$_x$FeAs and LaO$_{1-x}$F$_x$FeAs [PDF]

Supercond. Sci. Technol. 22, 015017(2009), 2008
Raman spectra have been measured on iron-based quaternary CeO$_{1-x}$F$_x$FeAs and LaO$_{1-x}$F$_x$FeAs with varying fluorine doping at room temperatures. A group analysis has been made to clarify the optical modes. Based on the first principle calculations, the observed phonon modes can be assigned accordingly. In LaO$_{1-x}$F$_x$FeAs, the E$_g$ and A$
Song‐Chuan Zhao, Dong Hou, Yizhang Wu, Tian‐Long Xia, A M Zhang, G F Chen, Jinming Luo, N L Wang, J. H. Wei, Zhong-Yi Lu, Q M Zhang   +10 more
arxiv   +3 more sources

Tunneling spectroscopy of $sπ$ pairing state as a model for FeAs superconductors [PDF]

arXiv, 2008
We present the self-consistent Bogoliubov-de Gennes calculations of an $s\pi$ pairing state of two band superconductivity as a model for the FeAs superconductors. The $s\pi$ state is an s-wave pairing state with an internal $\pi$ phase, that is, nodeless gaps on each band but with the opposite sign.
Han-Yong Choi, Yunkyu Bang
arxiv   +3 more sources

3D FEA modelling of laminated composites in bending and their failure mechanisms [PDF]

, 2014
keywords: 3D keywords: 3D keywords: 3D keywords: 3D keywords: 3DAbstract This paper developed three-dimensional (3D) Finite Element Analysis (FEA) to investigate the effect of fibre lay-up on the initiation of failure of laminated composites in bending ...
Berbinau, Bowles, Brøndsted, Budiansky, Gibson, H.R. Le, Halpin, Hull, Hyer, Jing, Kant, Kassapoglou, Kaw, Lee, Lekhnitskiĭ, Lemanski, Liu, M. Meng, M.J. Rizvi, Pagano, Pagano, Pipes, Pipes, Puppo, S.M. Grove, Soutis, Soutis, Tang, Tang, Tsai, Tsai, Voyiadjis, Wang, Wang, Whitney, Yang   +35 more
core   +3 more sources

Band structure of SrFeAsF and CaFeAsF as parent phases for a new group of oxygen-free FeAs superconductors [PDF]

, 2008
By means of first-principle FLAPW-GGA calculations, we have investigated the electronic properties of the newly discovered layered quaternary systems SrFeAsF and CaFeAsF as parent phases for a new group of oxygen-free FeAs superconductors. The electronic bands, density of states, Fermi surfaces, atomic charges, together with Sommerfeld coefficients and
I. R. Shein, A. L. Ivanovskiĭ
arxiv   +3 more sources

Mechanical and FEA-Assisted Characterization of Fused Filament Fabricated Triply Periodic Minimal Surface Structures

Journal of Composites Science, 2021
This paper investigates the mechanical behavior of additive manufactured Triply Periodic Minimal Surface (TPMS) structures, such as Gyroid, Schwarz Diamond and Schwarz Primitive.
N. Kladovasilakis, Konstantinos Tsongas, D. Tzetzis   +2 more
semanticscholar   +1 more source

An Overview of Methods and a New Three-Dimensional FEA and Analytical Hybrid Technique for Calculating AC Winding Losses in PM Machines

IEEE transactions on industry applications, 2021
This article proposes a new hybrid analytical and numerical finite element (FE) based method for calculating ac eddy current losses in wire windings and demonstrates its applicability for axial flux permanent magnet electric machines.
N. Taran, D. Ionel, V. Rallabandi, G. Heins, D. Patterson   +4 more
semanticscholar   +1 more source

Biomechanics in Removable Partial Dentures: A Literature Review of FEA-Based Studies

BioMed Research International, 2021
The present study was aimed at reviewing the studies that used finite element analysis (FEA) to estimate the biomechanical stress arising in removable partial dentures (RPDs) and how to optimize it.
M. Mousa, J. Abdullah, N. Jamayet, M. El-Anwar, K. Ganji, M. Alam, A. Husein   +6 more
semanticscholar   +1 more source