Zobrazeno 1 - 10
of 406
pro vyhledávání: '"Polla, G."'
Autor:
Abate, N., Toro, J., Polla, G., Irurzun, I., Passanante, S., Vega, D., Granja, L., Quintero, M.
Publikováno v:
In Ceramics International 15 December 2023 49(24) Part A:39945-39951
Publikováno v:
In Public Health January 2023 214:10-19
We have carried out an investigation of the structural, magnetic, transport and superconducting properties of Fe$_{1+z}$Te$_{1-x-y}$Se$_x$S$_y$ ceramic compounds, for $z=0$ and some specific Se (0$\leq$ x $\leq$ 0.5) and S (0 $\leq$ y $\leq$0.12) con
Externí odkaz:
http://arxiv.org/abs/1507.07853
The influence of the grain size in the magnetic properties of phase separated manganites is an important issue evidenced more than a decade ago. The formation of long range ordered phases is suppressed as the grain size decreases giving place to a me
Externí odkaz:
http://arxiv.org/abs/1410.0222
Pressure sensitivity (up to 1 GPa) of the electrical resistivity and of the ac susceptibility was measured for low electron doping levels of Ca$_{1-x}$Y$_x$MnO$_3$ (CYMO) and of Ca$_{1-x}$Sm$_x$MnO$_3$ (CSMO) ceramic samples (0.05 $\leq$ x $\leq$ 0.1
Externí odkaz:
http://arxiv.org/abs/cond-mat/0310044
Autor:
Sacanell, J., Quintero, M., Curiale, J., Garbarino, G., Acha, C., Freitas, R. S., Ghivelder, L., Polla, G., Leyva, G., Levy, P., Parisi, F.
Publikováno v:
Journal of Alloys and Compounds 369 / 1-2 (2004) pp. 74-77
We have studied the effect of irreversibility induced by repeated thermal cycles on the electric transport and magnetization of polycrystalline samples of La0.5Ca0.5MnO3 and La0.325Pr0.3Ca0.375MnO3. An increase of the resistivity and a decrease of th
Externí odkaz:
http://arxiv.org/abs/cond-mat/0309073
Autor:
Aliaga, H., Causa, M. T., Tovar, M., Butera, A., Alascio, B., Vega, D., Leyva, G., Polla, G., Konig, P.
We present a study of the magnetic properties of the electron doped manganites Ca1-xYxMnO3 (for 0<=x<=0.25) in the paramagnetic regime. For the less doped samples (x<=0.1) the magnetic susceptibility, c(T), follows a Curie-Weiss (CW) law only for T >
Externí odkaz:
http://arxiv.org/abs/cond-mat/0211242
Autor:
Levy, P., Parisi, F., Sacanell, J., Granja, L., Quintero, M., Curiale, J., Polla, G., Leyva, G., Freitas, R. S., Ghivelder, L., Acha, C., Koo, T. Y., Cheong, S. W.
We have studied magnetic and transport properties on different manganese oxide based compounds exhibiting phase separation: polycrystalline La5/8-yPryCa3/8MnO3 (y=0.3) and La1/2Ca1/2Mn1-zFezO3 (z = 0.05), and single crystals of La5/8-yPryCa3/8MnO3 (y
Externí odkaz:
http://arxiv.org/abs/cond-mat/0208199
Autor:
Levy, P., Parisi, F., Quintero, M., Granja, L., Curiale, J., Sacanell, J., Leyva, G., Polla, G., Freitas, R. S., Ghivelder, L.
Publikováno v:
Phys Rev. B 65, 140401(R) (2002)
We have measured magnetic and transport response on the polycrystalline La$_{5/8-y}$Pr$_y$Ca$_{3/8}$MnO$_3$ ($y=0.30$, average grain size 2 microns) compound. In the temperature range where ferromagnetic metallic and insulating regions coexist we obs
Externí odkaz:
http://arxiv.org/abs/cond-mat/0202261
Publikováno v:
Phys. Rev. Lett. 137001 (2002)
The time dependent response of the magnetic and transport properties of Fe-doped phase separated (PS) manganite La$_{0.5}$Ca$_{0.5}$MnO$_{3}$ is reported. The nontrivial coexistence of ferromagnetic (FM) and non FM regions induces a slow dynamics whi
Externí odkaz:
http://arxiv.org/abs/cond-mat/0202263