Navegação Ciências Exatas e da Terra por Assunto "Difração de nêutrons"

Resultados 1-6 de 6

    • Large resistivity change and phase transition in the antiferromagnetic semiconductors LiMnAs and LaOMnAs 

      Beleanu, Andreea; Kiss, Janos; Kreiner, Guido; Köhler, Christian; Müchler, Lukas; Schnelle, Walter; Burkhardt, Ulrich; Chadov, Stanislav; Medvediev, Sergiy; Ebke, Daniel; Felser, Claudia; Cordier, Gerhard; Albert, Barbara; Hoser, Andreas; Bernardi, Fabiano; Larkin, Timofei I.; Pröpper, Daniel; Boris, Alexander V.; Keimer, Bernhard (2013) [Artigo de periódico]
      Antiferromagnetic semiconductors are new alternative materials for spintronic applications and spin valves. In this work, we report a detailed investigation of two antiferromagnetic semiconductors AMnAs (A = Li, LaO), which ...

    • Magnetic behavior of the NixFe1−xNb2O6 quasi-one-dimensional system : isolation of Ising chains by frustration 

      Sarvezuk, Paulo Willian Carvalho; Gusmao, Miguel Angelo Cavalheiro; Cunha, Joao Batista Marimon da; Isnard, Olivier (2012) [Artigo de periódico]
      Physical properties of the NixFe1−xNb2O6 compounds are investigated combining x-ray and neutron powder diffraction with magnetic and calorimetry measurements as well as 57Fe Mössbauer spectroscopy. This system is known to ...

    • Mesoscopic magnetic states in metallic alloys with strong electronic correlations : a percolative scenario for CeNi/sub 1-x/Cu/sub x/ 

      Marcano, N.; Gómez Sal, J.C.; Espeso, José Ignacio; De Teresa, J.M.; Algarabel, P.A.; Paulsen, C.; Iglesias, Jose Roberto (2007) [Artigo de periódico]
      We present evidence for the existence of magnetic clusters of approximately 20 Å in the strongly correlated alloy system CeNi1-xCux (0.7 ≤ x ≤ 0.2) based on small angle neutron scattering experiments as well as the occurrence ...

    • A new approach for the determination of multiple cation locations and ordering, using the example of natural and heat-treated columbites 

      Kinast, Eder Julio; Isnard, Olivier; Cunha, Joao Batista Marimon da; Vasconcellos, Marcos Antonio Zen; Santos, Carlos Alberto dos (2011) [Artigo de periódico]
      A new approach is proposed to determine unambiguously the location of four cations within the crystal structure of a natural AB2O6 columbite-type compound and derivatives, when submitted to order–disorder transitions caused ...

    • Structural and spectroscopic investigation of the charge-ordered, short-range ordered, and disordered phases of the Co3O2BO3 ludwigite 

      Galdino, Carlos William; Freitas, Daniele; Medrano, Cynthia Paola Contreras; Sánchez, D. R.; Souza, Rodolfo Tartaglia; Rabello, L. P.; Mendonça, Alberto Aguiar; Ghivelder, Luis; Continentino, Mucio Amado; Zapata, Maximiliano Jesús Moreno; Pinheiro, Carlos Basílio; Azevedo, Gustavo de Medeiros; Rodríguez-Velamazán, J. A.; Garbarino, Gaston; Núñez-Regueiro, M.D.; Granado, E. (2021) [Artigo de periódico]
      Charge ordering is prone to occur in crystalline materials with mixed-valence ions. It is presumably accompanied by a structural phase transition, with possible exceptions in compounds that already present more than one ...

    • Suppression of magnetic ordering in quasi-one-dimensional FexCo1−xNb2O6 compounds 

      Sarvezuk, Paulo Willian Carvalho; Kinast, Eder Julio; Colin, C. V.; Gusmao, Miguel Angelo Cavalheiro; Cunha, Joao Batista Marimon da; Isnard, Olivier (2011) [Artigo de periódico]
      We present a systematic investigation of the series of compounds FexCo1−xNb2O6 by means of x-ray and neutron powder diffraction combined with magnetic measurements, carried out in the paramagnetic as well as in the ordered ...