Zobrazeno 1 - 10
of 575
pro vyhledávání: '"Pralong, V"'
Gigantic magnetic field polarization and magnetoelectric coupling in a ferrimagnetic oxide CaBaCo4O7
Autor:
Caignaert, V., Maignan, A., Singh, K., Simon, Ch., Pralong, V., Raveau, B., Mitchell, J. F., Zheng, H., Huq, A., Chapon, L.
The single crystal study of CaBaCo4O7, a non collinear ferrimagnet (TC=64K), with a polar orthorhombic space group (Pbn21) between 4 K and 293 K, shows the appearance below TC of a large electric polarization along its c axis, reaching 17mC.m-2 at 10
Externí odkaz:
http://arxiv.org/abs/1302.5541
Publikováno v:
Journal of superconductivity and Novel Magnetism, Vol. 25, Pg. 627 - 632 (2012)
The comparative study of the substitution of zinc and lithium for iron in the "114" ferrites, YBaFe4O7 and CaBaFe4O7, shows that these diamagnetic cations play a major role in tuning the competition between ferrimagnetism and magnetic frustration in
Externí odkaz:
http://arxiv.org/abs/1203.6220
Publikováno v:
Journal of Materials Chemistry, Vol. 22, Pg. 4728 (2012)
The study of the ferrites YBaFe4-xGaxO7 shows that the substitution of Ga for Fe in YBaFe4O7 stabilizes the hexagonal symmetry for 0.40 < x < 0.70, at the expense of the cubic one. Using combined measurements of a. c. and d. c. magnetization, we esta
Externí odkaz:
http://arxiv.org/abs/1202.6166
Publikováno v:
Physical Review B, Vol. 83, Pg. 214428 (2011)
The d.c. magnetization and magnetic relaxation studies of the calcium doped samples, Y0.95Ca0.05BaCo2O5.5 and YBa0.95Ca0.05Co2O5.5, show the existence of a magnetic glass like behaviour in the family of cobaltites for the first time. Our investigatio
Externí odkaz:
http://arxiv.org/abs/1106.6253
Publikováno v:
Physical Review B, Vol. 83, Pg. 094409 (2011)
An oxygen hyperstoichiometric ferrite CaBaFe4O7+\delta (\delta \approx 0.14) has been synthesized using "soft" reduction of CaBaFe4O8. Like the oxygen stoichiometric ferrimagnet CaBaFe4O7, this oxide also keeps the hexagonal symmetry (space group: P6
Externí odkaz:
http://arxiv.org/abs/1103.2939
Autor:
Kundu, Asish K., Seikh, Md. Motin, Srivastava, Akhilesh, Mahajan, S., Chatterjee, R., Pralong, V., Raveau, B.
Publikováno v:
J. Applied Physics, 110, 073904 (2011)
A comparative study of the effect of Fe and Ni doping on the bismuth based perovskite La0.6Bi0.4MnO3.1, a projected spintronics magnetic semiconductor has been carried out. The doped systems show an expressive change in magnetic ordering temperature.
Externí odkaz:
http://arxiv.org/abs/1102.4471
Publikováno v:
Chemistry of Materials, Vol. 22, Pg 6467-6473 (2010)
The triple "magnetic-transport-structural" transition versus temperature in three series of "114" cobaltites - Y1-xYbxBaCo4O7, Y1-xCaxBaCo4O7 and Yb1-xCaxBaCo4O7 - has been studied using magnetic, transport and differential scanning calorimetric meas
Externí odkaz:
http://arxiv.org/abs/1012.1449
Publikováno v:
J. Appl. Phys., 109, 093916 (2011)
The effect of oxygen content on the magnetic and transport properties of the ferromagnetic Eu0.9Ca0.1BaCo2O5.5+{\delta} has been carried out. Unlike the increase in TC with calcium content, paradoxally the TC value decreases with the increase in oxyg
Externí odkaz:
http://arxiv.org/abs/1010.1897
Publikováno v:
Chemistry of Materials, Vol. 22, Pages 2885 - 2891, 2010
The substitution of zinc for iron in YBaFe4O7 has allowed the oxide series YBaFe4-xZnxO7, with 0.40 < x < 1.50, belonging to the "114" structural family to be synthesized. These oxides crystallize in the hexagonal symmetry (P63mc), as opposed to the
Externí odkaz:
http://arxiv.org/abs/1005.0480
Publikováno v:
J. Mater. Sci., 46 (2011) 681
Investigation of the oxygen-deficient 112-type ordered oxides of the type LnBaCoMnO5+\delta (Ln = Nd, Eu) evidences certain unusual magnetic behavior at low temperatures, compared to the LnBaCo2O5+\delta cobaltites. One observes that the substitution
Externí odkaz:
http://arxiv.org/abs/1003.2262