Investigation

Main Publications

1 - V. S. Amaral, J. P. Araújo, Yu. G. Pogorelov, J. B. Sousa, P. B. Tavares,  J. M. Vieira, J. M. B. Lopes dos Santos, A. A. C. S. Lourenço, P. A. Algarabel, "Anomalous Low-Field Magnetization in La_2/3Ca_1/3MnO₃ near the Critical Point: Stable Clusters?", Journal of Applied Physics, 83 (11) June 1 (1998) 7154-7156. (pdf file 79 kB)

2 - P. B. Tavares, V. S. Amaral, J.P. Araújo, A.A.C.S. Lourenço, J.M. Vieira, J.B. Sousa, “Deposition of LaCaMnO₃ thin films using aerosol-assisted metalorganic chemical vapor deposition (MOCVD) substrate and annealing effects”, Journal of Magnetism and Magnetic Materials 196-197 (1999) 490-492.

3 - A.A.C.S. Lourenço, J.P. Araújo, V. S. Amaral, P. B. Tavares, J.B. Sousa, J.M. Vieira, E. Alves, M.F. da Silva, J.C. Soares, “Properties of epitaxial LaCaMnO laser ablated thin films on (100) and (110) SrTiO₃ substrates”, Journal of Magnetism and Magnetic Materials 196-197 (1999) 495-497.

4 - P. B. Tavares, V. S. Amaral, J. P. Araújo, J. B.Sousa, A.A.C.S. Lourenço, J. M. Vieira, “Substrate, annealing and Mn excess effects on La-Ca-MnO₃ thin films grown by metalorganic chemical vapor deposition: a way to room-temperature Tc”, Journal of Applied Physics, 85 (8) april 15 (1999) 5411-5413. (pdf file 257 kB)

5 - V. S. Amaral, A.A.C.S. Lourenço, J.P. Araújo, P. B. Tavares, E. Alves, J.B. Sousa, J.M. Vieira, M.F. da Silva, J.C. Soares, “Anisotropic transport properties of epitaxial La_2/3Ca_1/3MnO₃ thin films with different growth orientations (invited)”, Journal of Magnetism and Magnetic Materials 211 (2000) 1-8.

6 - V. S. Amaral, A.A.C.S. Lourenço, J.P. Araújo, A.M. Pereira, J.B. Sousa, P. B. Tavares, J.M. Vieira, E. Alves, M.F. da Silva, J.C. Soares, “Anisotropic electrical transport in epitaxial La_2/3Ca_1/3MnO₃ thin films”, Journal of Applied Physics, 87 (8) 15 april 2000 5570-5572. (pdf file 66 kB)

7 - J.P. Araújo, V.S. Amaral, P.B. Tavares, F. Lencart-Silva, A.A.C.S. Lourenço, E. Alves, J.B. Sousa, J.M. Vieira, “Cadmium addition to vacancy doped Lanthanum manganites: from metallic to insulator behaviour”, Journal of Magnetism and Magnetic Materials, 226-230 (2001) 797-799.

8 - J.P. Araújo, V.S. Amaral, P.B. Tavares, F. Lencart-Silva, A.A.C.S. Lourenço, J.B. Sousa, J.M. Vieira, “Doping manganites by La-site vacancies and Ca ions: bulk ceramics and thin films”, Journal of Magnetism and Magnetic Materials, 226-230 (2001), pp. 821-823. .

9 - V.S. Amaral, J.P. Araújo, Yu. G. Pogorelov, J.M.B. Lopes dos Santos, P.B. Tavares, A.A.C.S. Lourenço, J.B. Sousa, J.M. Vieira, “Anomalous magnetic behaviour in La_2/3Ca_1/3MnO₃ near the critical point: stable clusters and crossover to uniform ferromagnetism”, Journal of Magnetism and Magnetic Materials, 226-230 (2001) 837-839.

10 - V.S. Amaral, J.P. Araújo, A.A.C.S. Lourenço, P.B. Tavares, Yu. G. Pogorelov, J.B. Sousa, J.M. Vieira, “Non-linear conduction in LaCaMnO₃ thin films: interface tunneling effects”, Journal of Magnetism and Magnetic Materials, 226-230 (2001) 942-944.

11 - J.P. Araújo, J.G. Correia, V.S. Amaral, P.B. Tavares, F. Lencart-Silva, A.A.C.S. Lourenço, J.B. Sousa, J.M. Vieira, J.C. Soares, “Hyperfine fields at Cd site on La_0.67Cd_0.25MnO₃ CMR manganites”, Hyperfine Interactions, 133 (1-4) (2001) 89-94. (pdf file 83 kB)

12 - V.S. Amaral, J.P. Araujo, Y.G. Pogorelov, P.B. Tavares, J.B. Sousa, J.M. Vieira, “Discontinuous transition effects in manganites: magnetization study in the paramagnetic phase”, Journal of Magnetism and Magnetic Materials, 242 (2002) Part 2  655-658. 

13 - P.B. Tavares, V.S. Amaral, D. Araújo, M.C. Oliveira, J.M. Vieira, “Substrate and Composition Effects on BSCCO Thin Films Deposited by Aerosol MOCVD”, Key Engineering Materials, 230-232 (2002) 173-176.

14 - M.C. Oliveira, P.B. Tavares, J.M. Vieira, “Towards the Preparation of Superconductor Bi₂Sr₂CaCu₂O_8+delta Films by Electrodeposition”, Key Engineering Materials, 230-232 (2002) 144-147.

15 – V.S. Amaral, J.P. Araújo, Y.G. Pogorelov, J.B. Sousa, P.B. Tavares, J.M. Vieira, P.A. Algarabel, M.R. Ibarra, “Tricritical Points in La-based Ferromagnetic Manganites”, Journal of Applied Physics, 93 (10) 15 May 2003, pp 7646-7648 part 3. (pdf file 128 kB)

16 – F. Figueiras, J.P. Araújo, V.S. Amaral, P.B. Tavares, A.B. Lopes, J.M. Vieira, “Phase and Structural Study of Self-doped La_1-x-yCa_xVac_yMnO_3+delta”, Acta Physica Polonica A, 105 (1-2): 173-182 JAN-FEB 2004.

17 – M.S.Reis, A.M. Gomes, J.P. Araujo, P.B. Tavares, J.S. Amaral, I.S. Oliveira, V.S. Amaral, “Charge-Ordering and Magnetoelastic Coupling Effects on the Magnetocaloric Properties of Manganites”, Acta Physica Polonica A 105 (1-2): 163-171 JAN-FEB 2004.

18 – M.S. Reis, A.M. Gomes, J.P. Araújo, P.B. Tavares, I.S. Oliveira, V.S. Amaral, “Positive and ‘colossal’ magnetocaloric effect due to charge ordering in CMR manganites”, Journal of Magnetism and Magnetic Materials 272–276 (2004) 2393–2394. (pdf file 189 kB)

19 – A.M. Gomes, M.S. Reis, A.P. Guimarães, P.B. Tavares, J.P. Araújo, V.S. Amaral, “Magnetocaloric effect on the Pr_0,43Gd_0,25Ca_0,32MnO₃ manganite”, Journal of Magnetism and Magnetic Materials 272–276 (2004) 2385–2386. (pdf file 219 kB)

20 – A.M.L. Lopes, J.P. Araújo, A.M. Gomes, M.S. Reis, V.S. Amaral, P.B. Tavares, “Cadmium doping at Mn site in Pr_0,5Ca_0,5MnO₃”, Journal of Magnetism and Magnetic Materials 272–276 (2004) 1767–1768. (pdf file 293 kB)

21 – F. Figueiras, J.P. Araúo, V.S. Amaral, P.B. Tavares, J.B. Sousa, J.M. Vieira, “Structural and magnetic study of self- doped La_1-x-yCa_xVac_yMnO₃”, Journal of Magnetism and Magnetic Materials 272–276 (2004) 1753–1755. (pdf file 229 kB)


Other publications 

 PhD thesis complete pdf file (1652 kB) (Português)
    Abstract (English) (Português)

1 - J. P. Araújo,  P. B. Tavares, V. S. Amaral, A. A. C. S. Lourenço, J. B. Sousa, J. M. Vieira, "Giant Magnetoresistance in La_1-xCa_xMnO₃ Ceramics and Thin Films", Key Engineering Materials, 132-136 (1997) pp. 1416-1419.

2 - P. B. Tavares, V. S. Amaral, J. P. Araújo, A. A. C. S. Lourenço, J. B. Sousa, J. M. Vieira, "Deposition of Magnetoresistive La_1-xCa_xMnO₃ Thin Films by Aerosol-assisted MOCVD", Key Engineering Materials, 132-136 (1997) pp. 1412-1415.

3 - L. H. M. Carvalho, T. de Koe, P. B. Tavares, "An Improved Molybdenum Blue Method for Simultaneous Determination of  Inorganic Phosphate and Arsenate", Ecotoxicology and Environmental Restoration, 1, (1997) 13-19.

4 - J. P. Araújo, Yu. G. Pogorelov, V. S. Amaral, J. B. Sousa, P. B. Tavares, J. M. Vieira, "Anomalous Low-Field Magnetization in La_1-xCa_xMnO₃ near Critical Point", V. G. Bar’yakhtar et al (eds.), "Frontiers in Magnetism of Reduced Dimensions Systems" (1998) pp. 153-158, Kluwer Academic Publishers.

5 - Pedro Bandeira Tavares, "Trabalhos Práticos de Química-Física", Série Didáctica - Ciências Puras, nº10, UTAD, Vila Real (1995) - ISBN: 972-669-164-4.