1 Crismat-ismra
نویسنده
چکیده
In the manganite Nd0.5Ca0.5MnO3, charge ordering occurs at much higher temperature than the antiferromagnetic order (TCO = 250K, TN = 160K). the magnetic behavior of the phase TN < T < TCO is puzzling: its magnetization and susceptibility are typical of an antiferromagnet while no magnetic order is detected by neutron diffraction.We have undertaken an extensive study of the cristallographic, electric and magnetic properties of Nd0.5Ca0.5MnO3 and established its phase diagram as a function of temperature and magnetic field. The charge disordered, paramagnetic phase above TCO present ferromagnetic correlations. An antiferromagnetic CE phase prevails below TN , with complete charge and orbital ordering. In the intermediate temperature range, charge ordering occurs while orbital ordering sets in progressively, with no magnetic order. Strong magnetic fields destroy the charge ordered phases in a fisrt order transition towards a ferromagnetic state. .
منابع مشابه
SCANDAL - A FACILITY FOR ELASTIC NEUTRON SCATTERING STUDIES IN THE 50–130 MeV RANGE
J. Blomgren∗1, J. Klug1,5, P. Mermod1, L. Nilsson1, S. Pomp1, A. Öhrn1, Michael Österlund1, A.V. Prokofiev2, U. Tippawan1,3, J.F. Lecolley4, F.R. Lecolley4, N. Marie-Noury4, I. Sagrado-Garcia4, G. Ban4, G. Iltiss4, J.-M. Fontbonne4 1Department of Neutron Research, Uppsala University, Sweden 2The Svedberg Laboratory, Uppsala University, Sweden 3Fast Neutron Research Facility, Chiang Mai Universi...
متن کاملChaotic scattering on surfaces and collisional damping of collective modes
Klaus Morawetz, Michael Vogt, Uwe Fuhrmann, Pavel Lipavský, Václav Špička 1 LPC, IN2P3-CNRS, ISMRA, 6 Bd du Marechal Juin, Caen, 14050, France 2 GANIL, B.P. 5027, Bd Henri Becquerel, 14076 Caen Cedex 5, France 3 Fachbereich Physik, University Rostock, D-18055 Rostock, Germany 4 Institute of Philosophy, University Rostock, D-18055 Rostock, Germany 5 Institute of Physics, Academy of Sciences, Cuk...
متن کاملHigh-efficiency thermoelectric Ba8Cu14Ge6P26: bridging the gap between tetrel-based and tetrel-free clathrates† †Electronic supplementary information (ESI) available: Calculated and experimental powder XRD patterns; tables with crystallographic information; SEM and EDS results; additional DSC, thermal conductivities, and ZT figures. CCDC 1568106. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c7sc03482b
Department of Chemistry, Iowa State Unive Department of Chemistry, University of Ca [email protected] Laboratoire CRISMAT, ENSICAEN, CNRS, U Thermal Energy Conversion Research an Laboratory, Pasadena, CA 91109, USA Department of Physics, University of Califo Ames Laboratory, Iowa State University, Am † Electronic supplementary informatio experimental powder XRD patterns; tab SEM and EDS result...
متن کاملExperimental Evidence for Spinodal Decomposition in Multifragmentation of Heavy Systems
G. TĂBĂCARU, B. BORDERIE, M.F. RIVET, P. CHOMAZ,M. COLONNA, J.D. FRANKLAND, A. GUARNERA, M. PÂRLOG, B. BOURIQUET, A. CHBIHI, S. SALOU, J.P. WIELECZKO, G. AUGER, CH.O. BACRI, N. BELLAIZE, R. BOUGAULT, R. BROU, P. BUCHET, J.L. CHARVET, J. COLIN,D. CUSSOL, R. DAYRAS, A. DEMEYER, D. DORÉ, D. DURAND, E. GALICHET, E. GERLIC, B. GUIOT, S. HUDAN, D. GUINET, P. LAUTESSE, F. LAVAUD, J.L. LAVILLE, J.F. LE...
متن کاملControlling superstructural ordering in the clathrate-I Ba8M16P30 (M = Cu, Zn) through the formation of metal–metal bonds† †Electronic supplementary information (ESI) available: Experimental details, tables of crystal structure refinements and structural parameters and associated CIFs, synchrotron X-ray and neutron powder diffraction Rietveld refinement plots, additional TEM and elemental analysis figures, LMTO DOS and band structure diagrams. See DOI: 10.1039/c7sc00354d Click here for additional data file.
Department of Chemistry, University of Cal CA 95616, USA. E-mail: [email protected] Chemical and Engineering Materials Divisi Ridge, Tennessee 37830, USA Laboratoire CRISMAT, ENSICAEN, CNRS U F-14050 Caen, France † Electronic supplementary information tables of crystal structure renements an CIFs, synchrotron X-ray and neutron p plots, additional TEM and elemental an structure diagrams. See D...
متن کامل