Zobrazeno 1 - 10
of 92
pro vyhledávání: '"Kant, Ch."'
Autor:
Sushkov, A. B., Kant, Ch., Schiebl, M., Shuvaev, A. M., Pimenov, Anna, Pimenov, Andrei, Lorenz, B., Park, S., Cheong, S-W., Mostovoy, Maxim, Drew, H. D.
Publikováno v:
Physical Review B 90, 054417 (2014)
The origin of the colossal magnetodielectric effect in DyMn2O5 [1] has been an outstanding question in multiferroics. Here, we report the activation of the electric dipole mode at 4-5 cm-1 in an applied magnetic field which fully accounts for the CMD
Externí odkaz:
http://arxiv.org/abs/1403.3717
Autor:
Schmidt, M., Wang, Zhe, Kant, Ch., Mayr, F., Toth, S., Islam, A. T. M. N., Lake, B., Tsurkan, V., Loidl, A., Deisenhofer, J.
Publikováno v:
Phys. Rev. B 87, 224424 (2013)
We report on optical transmission spectroscopy of the Cr-based frustrated triangular antiferromagnets CuCrO2 and alpha-CaCr2O4, and the spinels CdCr2O4 and ZnCr2O4 in the near-infrared to visible-light frequency range. We explore the possibility to s
Externí odkaz:
http://arxiv.org/abs/1210.3938
Publikováno v:
Eur. Phys. J. B (2012) 85: 164
We report on a systematic optical investigation of w\"ustite. In addition, the sample under consideration, Fe0.93O, has been characterized in detail by electrical transport, dielectric, magnetic and thermodynamic measurements. From infrared reflectiv
Externí odkaz:
http://arxiv.org/abs/1203.1201
Publikováno v:
Phys. Rev. Lett. 108, 177203 (2012)
We report a linear dependence of the phonon splitting \Delta\omega on the non-dominant exchange coupling constant J_{nd} in the antiferromagnetic transition-metal monoxides MnO, FeO, CoO, NiO, and in the frustrated antiferromagnetic oxide spinels CdC
Externí odkaz:
http://arxiv.org/abs/1109.4809
We propose a novel mechanism for exchange-induced exciton-magnon absorptions via hopping between two antiferromagnetically coupled sites and a simultaneous magnetic dipole transition to an excited orbital state. The obtained selection rules correspon
Externí odkaz:
http://arxiv.org/abs/1109.0295
Publikováno v:
Supercond. Sci. Technol. 24 (2011) 045009
We report on structural, susceptibility, conductivity, and heat-capacity studies of FeSe0.5Te0.5 single crystals with 2% substitution of Mn for Fe. Mn-doped samples show a higher onset temperature, a narrower width of the superconducting transition,
Externí odkaz:
http://arxiv.org/abs/1010.5597
Autor:
Tsurkan, V., Deisenhofer, J., Günther, A., Kant, Ch., von Nidda, H. -A. Krug, Schrettle, F., Loidl, A.
Publikováno v:
Eur. Phys. J. B 79, 289-299 (2011)
We report on structural, magnetic, conductivity, and thermodynamic studies of FeSe$_{0.5}$Te$_{0.5}$ single crystals grown by self-flux and Bridgman methods. The samples were prepared from starting materials of different purity at various temperature
Externí odkaz:
http://arxiv.org/abs/1006.4453
Magnetic and superconducting transitions in Ba$_{1-x}$K$_x$Fe$_{2}$As$_{2}$ studied by specific heat
Publikováno v:
Phys. Rev. B 81, 014529 (2010)
We report on specific heat measurements in Ba$_{1-x}$K$_x$Fe$_{2}$As$_{2}$ ($x\le 0.6$). For the underdoped sample with $x=0.2$ both the spin-density-wave transition at $T = 100$ K and the superconducting transition at 23 K can be identified. The ele
Externí odkaz:
http://arxiv.org/abs/0910.0389
Autor:
Kant, Ch., Deisenhofer, J., Rudolf, T., Mayr, F., Schrettle, F., Loidl, A., Gnezdilov, V., Wulferding, D., Lemmens, P., Tsurkan, V.
Publikováno v:
Phys. Rev. B 80, 214417 (2009)
We report on infrared, Raman, magnetic susceptibility, and specific heat measurements on CdCr2O4 and ZnCr2O4 single crystals. We estimate the nearest-neighbor and next-nearest neighbor exchange constants from the magnetic susceptibility and extract t
Externí odkaz:
http://arxiv.org/abs/0906.3639
Publikováno v:
J. Phys.: Conf. Ser. 200, 032032 (2010)
We analyzed the magnetic susceptibilities of several Cr spinels using two recent models for the geometrically frustrated pyrochlore lattice, the Quantum Tetrahedral Mean Field model and a Generalized Constant Coupling model. Both models can describe
Externí odkaz:
http://arxiv.org/abs/0905.4903