Results 101 to 110 of about 17,348 (202)

Metallic "Ferroelectricity" in the Pyrochlore Cd2Re2O7

Physical review letters, 2004
A class of materials known as ``ferroelectric metals'' was discussed theoretically by Anderson and Blount in 1965 [Phys. Rev. Lett. 14, 217 (1965)], but to date no examples of this class have been reported. Here we present measurements of the elastic moduli of Cd2Re2O7 through the 200 K cubic-to-tetragonal phase transition.
Sergienko, I. A., Keppens, V., McGuire, M., Jin, R., He, J., Curnoe, S. H., Sales, B. C., Blaha, P., Singh, D. J., Schwarz, K., Mandrus, D.   +10 more
openaire   +3 more sources

Chemical trends of superconducting properties in pyrochlore oxides

, 2006
Chemical trends of fundamental superconducting parameters and normal-state properties are described for a family of pyrochlore oxide superconductors. Particularly, the change of Tc from 1.0 K for alpha-pyrochlore Cd2Re2O7 to 3.3 K (A = Cs), 6.3 K (Rb ...
Allen, Arai, Bednorz, Brühwiler, Brühwiler, Hanawa, Harima, Hiroi, Hiroi, Hiroi, Hiroi, Hiroi, Hisatomo Harima, Jun-Ichi Yamaura, Kadowaki, Kazakov, Khasanov, Khasanov, Koda, Kunes, Kuroki, Mackenzie, Magishi, Mandrus, Marsiglio, Miyake, Muramatsu, Muramatsu, Ohmichi, Saniz, Saniz, Schneider, Schuck, Shigeki Yonezawa, Singh, Sleight, Vyaselev, Vyaselev, Yamaura, Yonezawa, Yonezawa, Yonezawa, Zenji Hiroi   +42 more
core   +1 more source

Synthesis and NEXAFS and XPS Characterization of Pyrochlore-Type Bi_1.865Co_1/2Fe_1/2Ta₂O_9+Δ

Chemistry
A cubic pyrochlore with the composition Bi1.865Co1/2Fe1/2Ta2O9+Δ (space group Fd-3m, a = 10.5013(8) Å) was synthesized from oxide precursors using solid-phase reactions.
Nadezhda A. Zhuk, Sergey V. Nekipelov, Olga V. Petrova, Aleksandra V. Koroleva, Aleksey M. Lebedev, Boris A. Makeev   +5 more
doaj   +1 more source

Spin-lattice coupling in frustrated antiferromagnets

, 2009
We review the mechanism of spin-lattice coupling in relieving the geometrical frustration of pyrochlore antiferromagnets, in particular spinel oxides. The tetrahedral unit, which is the building block of the pyrochlore lattice, undergoes a spin-driven ...
Becca, F, Capriotti, L, Parola, A, Sorella, S   +3 more
core   +1 more source

'CHEMICAL ASSEMBLY' SYNTHESIS OF PIEZO-PHASE NANOSIZE POWDERS USED FOR PIEZO-CERAMICS MANUFACTURING

Вестник Донского государственного технического университета, 2018
'Chemical assembly' method of the nanoprecursors multifunctional matrixes which skeleton structure is similar to the structure of a final reaction product is developed.
Larisa E. PUSTOVAYA, Aleksey A. NESTEROV, Vladimir V. КRIKOV, Alexander S. PAKHOMOV   +3 more
doaj  

Features of Synthesis, Crystal Structure, Thermal and Electrical Properties, XPS/NEXAFS Study of Pyrochlore-Type Bi₂Cr_0.5Co_0.5Nb₂O_9+Δ

Chemistry
The phase-pure cubic pyrochlore of the Bi2Cr0.5Co0.5Nb2O9+Δ composition can be successfully synthesized by a modified sol–gel method (Pecini method-PM) and a traditional solid-phase method (SPM).
Nadezhda A. Zhuk, Nikolay A. Sekushin, Maria G. Krzhizhanovskaya, Vladislav V. Kharton, Danil V. Sivkov, Sergey V. Nekipelov   +5 more
doaj   +1 more source

Four-coloring model and frustrated superfluidity in the diamond lattice

, 2013
We propose a novel four-coloring model which describes "frustrated superfluidity" of $p$-band bosons in the diamond optical lattice. The superfluid phases of the condensate wavefunctions on the diamond-lattice bonds are mapped to four distinct colors at ...
Chern, Gia-Wei, Wu, Congjun
core   +1 more source

The spin-1/2 Heisenberg ferromagnet on the pyrochlore lattice: A Green's function study

Condensed Matter Physics, 2018
We consider the pyrochlore-lattice quantum Heisenberg ferromagnet and discuss the properties of this spin model at arbitrary temperatures. To this end, we use the Green's function technique within the random-phase (or Tyablikov) approximation as well as ...
T. Hutak, P. Müller, J. Richter, T. Krokhmalskii, O. Derzhko   +4 more
doaj   +1 more source

Phase competition in the double-exchange model on the frustrated pyrochlore lattice

, 2010
Competition between the ferromagnetic double-exchange interaction and the super-exchange antiferromagnetic interaction is theoretically studied in the presence of geometrical frustration.
Furukawa, Nobuo, Motome, Yukitoshi
core   +1 more source

Process—structure correlations in co-precipitation synthesized lanthanum zirconates

Materials Research Express
Rare Earth Zirconates with pyrochlore/flourite structure have attracted interests owing to their immense potential in modern technological applications.
Saideep Shirish Bhat, K A Irshad, Mahima Almeida, M Sivakumar, P Vairavel, S C Gurumurthy, Raghavendra K G   +6 more
doaj   +1 more source