Abstract (EN):
We report high resolution measurements of the electrical resistivity (rho, d rho/dT) and thermopower (S, dS/dT) measurements near the magnetic and structural transition of the layered Tb5Si2Ge2 compound, which are fairly close but not fully coupled. The analysis of the transport properties confirms a split magneto/structural transition, with T-s similar to 97 K and T-s similar to 107 K for the structural transition (on cooling and heating respectively; 1st-order transition). The magnetic transition occurs only at T-c similar to 112 K and without hysteresis (2nd-order transition). The magnetic critical behavior of resistivity is analyzed, obtaining an almost classical mean field exponent (alpha similar to 0.59) for T > T-c. For the structural phase, and below Ts, we obtain a rather different exponent (alpha similar to 1.06).
Idioma:
Inglês
Tipo (Avaliação Docente):
Científica
Contacto:
ampereira@fc.up.pt
Nº de páginas:
3