3 papers
cond-mat.supr-con2005
Lower critical field and intragrain critical current density in the ruthenate-cuprate RuSrGdCeCuO
M. G. das Virgens, S. García, L. Ghivelder
The lower critical field of the grains, , and the intragrain critical current density, , were determined for the superconducting ruthenate-cuprate RuSrGd$_{1.5…
cond-mat.supr-con2004
Intergranular pinning potential and critical current in the magnetic superconductor RuSr2Gd1.5Ce0.5Cu2O10
M. G. das Virgens, S. Garcia, M. A. Continentino +1
The intergranular pinning potential U and the critical current density Jc for polycrystalline RuSr2Gd1.5Ce0.5Cu2O10 ruthenate-cuprate were determined at zero magnetic field and tem…
cond-mat.mtrl-sci2003
Abrupt field-induced transition triggered by magnetocaloric effect in phase-separated manganites
L. Ghivelder, R. S. Freitas, M. G. das Virgens +7
The occurrence at low temperatures of an ultrasharp field-induced transition in phase separated manganites is analyzed. Experimental results show that magnetization and specific he…