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Study of superconductor materials


The research project which we are presenting in the area of conventional and critical high temperature superconductors, in essence, is an integrated program which involves three research groups from the GW Institute of Physics of UNICAMP and various national and international collaborations from different participating groups. The participating groups had been developing over four years a FAPESP thematic project (process no. 91/00573-0) which ended in December 1995. This project is a continuation of the thematic project referred to above and also contains new research themes which emerged in the last few years. The participating groups of this project are: the group of optical and magnetic properties of solids (GPOMS) of DEQ-IFGW. This group emerged recently from the fusion of the Magnetic Properties Laboratory (MPL) and the Spectroscopy Laboratory (SL); Laboratory for Materials and Devices (LMD) DFA-IFGW; Laboratory of Materials and Low Temperatures (LMLT) DESCM-IFGW. The resources requested in the present project will be used principally in the improvement of the research infrastructure common to all the participating groups (measurement of AC and DC magnetization, AC and DC resistivity, preparation of samples, etc.), as well as, the implementation and/or improvement of experimental techniques by each one of the groups. The team responsible for this project proposal and its execution is made up of independent groups but in an integrated mode and with mutual collaboration, which in a responsible and participative manner share a common objective. The activities of each group in the project are defined in an articulated and cooperative manner, and are as follows: preparation of samples (monocrystalline, monocrystalline, thin films and dopings), measurements of R vs. T e Jc (LMD, LMLT), DC susceptibility with SQUID (PML), Raman (SL). That is, the preparation of samples will be carried out in the LMD, the basic macroscopic characterization of the superconductor state will be carried out in the LMD and in the LMLT, and the microscopic study with EPR and Raman in the MPL and SL respectively. With the experience which each group already has in the research activities in which it is proposed to act, we believe that the project will be feasibly completed within the proposed timeframe. During the implementation of this project the arrival of visiting professors is envisaged, as well as the traveling of members of the team for short training courses and conferences. Taking advantage of this and of the existing collaboration agreements with other institutions, we intend to complement the proposed research activities with other techniques and materials. We hope that this project, even though long term, will generate other lines of research and characterization techniques, which will contribute towards obtaining new superconductor materials, training of personnel specialized in the area, in the supply of samples to other interested groups and in the widening of collaborations in the area. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MARTINHO, H.; MORENO, N. O.; SANJURJO, J. A.; RETTORI, C.; GARCÍA-ADEVA, A. J.; HUBER, D. L.; OSEROFF, S. B.; RATCLIFF, W.; CHEONG, S. W.; PAGLIUSO, P. G.; et al. Magnetic properties of the frustrated antiferromagnetic spinel ZnCr2O4 and the spin-glass Zn1-xCdxCr2O4 (x=0.05,0.10). Physical Review B, v. 64, n. 2, p. 244081-244086, . (95/04721-4)

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