Zobrazeno 1 - 10
of 257
pro vyhledávání: '"Guntherodt, G."'
Autor:
Gasparov, L. V., Arenas, D., Choi, K. -Y., Guntherodt, G., Berger, H., Forro, L., Margaritondo, G., Struzhkin, V. V., Hemley, R.
Publikováno v:
Journal of Applied Physics 97, 10A922 (2005)
We report the results of a low-temperature (300K-15K) high-pressure (up to 22GPa) Raman study of the Verwey transition in magnetite (Fe3O4). We use additional Raman modes observed below the Verwey transition to determine how the transition temperatur
Externí odkaz:
http://arxiv.org/abs/0907.2456
Publikováno v:
PRB 79, 144303 (2009)
We report Raman scattering data of single crystals of magnetite (Fe3O4) with Verwey transition temperatures (Tv) of 123 and 117K, respectively. Both single crystals reveal broad electronic background extending up to 900 wavenumbers (~110 meV). Redist
Externí odkaz:
http://arxiv.org/abs/0907.1424
Autor:
Venkatesh, R., Pattabiraman, M., Angappane, S., Rangarajan, G., Sethupathi, K., Karatha, Jessy, Fecioru-Morariu, M., Ghadimi, R. M., Guntherodt, G.
The magnetocaloric effect in single crystalline Nd_{0.7}Sr_{0.3}MnO_{3} is investigated by measuring the field-induced adiabatic change in temperature which reveals a single negative peak around 130 K well below the Curie temperature (T_C=203 K). In
Externí odkaz:
http://arxiv.org/abs/0706.1610
Autor:
Guerrero, R., Aliev, F. G., Villar, R., Hauch, J., Fraune, M., Guntherodt, G., Rott, K., Bruckl, H., Reiss, G.
Publikováno v:
Appl. Phys. Lett. 87, 042501 (2005)
We report on tunnelling magnetoresistance (TMR), current-voltage (IV) characteristics and low frequency noise in epitaxially grown Fe(110)/MgO(111)/Fe(110) magnetic tunnel junctions (MTJs) with dimensions from 2x2 to 20x20 um2. The evaluated MgO ener
Externí odkaz:
http://arxiv.org/abs/cond-mat/0609423
Recently a new propagating mode of coupled charge and spin oscillations was predicted in a two dimensional electron gas with a sufficiently strong Rashba interaction. We show that Coulomb interactions qualitatively modifies the spectrum and increases
Externí odkaz:
http://arxiv.org/abs/cond-mat/0511534
Publikováno v:
Physics Reports, 376, 1-103 (2003)
An overview of one- and two-dimensional quantum spin systems based on transition-metal oxides and halides of current interest is given, such as spin-Peierls, spin-dimer, geometrically frustrated and ladder systems. The most significant and outstandin
Externí odkaz:
http://arxiv.org/abs/cond-mat/0301413
Autor:
Lemmens, Peter, Grove, M., Fischer, M., Guntherodt, G., Kotov, Valeri N., Kageyama, H., Onizuka, K., Ueda, Y.
Publikováno v:
Phys. Rev. Lett. 85, 2605 (2000).
We present a Raman light scattering study of the two-dimensional quantum spin system SrCu2(BO3)2 and show that the magnetic excitation spectrum has a rich structure, including several well-defined bound state modes at low temperature, and a scatterin
Externí odkaz:
http://arxiv.org/abs/cond-mat/0003094
Single crystals of the optimally doped, moderately and strongly overdoped high temperature superconductor Tl2Ba2CuO6+x (Tl-2201) with Tc=80, 56 and 30K, respectively, have been investigated by polarized Raman scattering. By taking the peak position o
Externí odkaz:
http://arxiv.org/abs/cond-mat/9809159
Electronic Raman scattering in Tl-2201 has been investigated in order to test whether the scattering cross-section in high temperature superconductors depends on the number of CuO2-planes, i.e. sheets or specific details of the Fermi surface. The exp
Externí odkaz:
http://arxiv.org/abs/cond-mat/9609237
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