[1] Univ Fed Sao Carlos, Grp Supercondutividade & Magnetismo, Ctr Multidisciplinar Desenvolvimento Mat Ceram, Dept Fis, BR-13565905 Sao Carlos, SP, Brazil
[2] Univ Fed Parana, Dept Fis, BR-81531990 Curitiba, Parana, Brazil
[3] Univ Paris 06, Lab Mineral & Crystallog Paris, F-75252 Paris, France
[4] Univ Paris 07, Lab Mineral & Crystallog Paris, F-75252 Paris, France