Results 101 to 110 of about 17,445 (204)

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

Degenerate perturbation theory of quantum fluctuations in a pyrochlore antiferromagnet

, 2006
We study the effect of quantum fluctuations on the half-polarized magnetization plateau of a pyrochlore antiferromagnet. We argue that an expansion around the easy axis limit is appropriate for discussing the ground state selection amongst the ...
Balents, Leon, Bergman, Doron L., Fiete, Gregory A., Shindou, Ryuichi   +3 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

'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

Cluster-glass phase in pyrochlore XY antiferromagnets with quenched disorder

, 2018
We study the impact of quenched disorder (random exchange couplings or site dilution) on easy-plane pyrochlore antiferromagnets. In the clean system, order-by-disorder selects a magnetically ordered state from a classically degenerate manifold.
Andrade, Eric C., Hoyos, José A., Rachel, Stephan, Vojta, Matthias   +3 more
core   +1 more source

Pyrochlore Antiferromagnet: A Three-Dimensional Quantum Spin Liquid

, 1998
The quantum pyrochlore antiferromagnet is studied by perturbative expansions and exact diagonalization of small clusters. We find that the ground state is a spin-liquid state: The spin-spin correlation functions decay exponentially with distance and the ...
A. B. Harris, A. B. Harris, A. Chubukov, B. Canals, C. L. Henley, C. Lacroix, G. Ferey, G. Ferey, H. Nakamura, J. C. Bonner, J. N. Reimers, J. N. Reimers, J. N. Reimers, M. J. P. Gingras, M. Mekata, M. Shiga, M. Shiga, M. Shiga, N. Elstner, P. Chandra, P. Lecheminant, P. W. Anderson, P. W. Anderson, R. Ballou, R. Liebmann, S. T. Bramwell   +25 more
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

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

Ground State Phase Diagram of Generic XY Pyrochlore Magnets with Quantum Fluctuations

, 2013
Motivated by recent experimental and theoretical progress on the Er2Ti2O7 pyrochlore XY antiferromagnet, we study the problem of quantum order-by-disorder in pyrochlore XY systems. We consider the most general nearest-neighbor pseudo spin-1/2 Hamiltonian
Gingras, Michel J. P., Hao, Zhihao, Wong, Anson W. C.   +2 more
core   +1 more source