Study of strongly correlated electronic and magnetic systems

• Grant number: 00/08649-6
• Support type: Research Projects - Thematic Grants
• Duration: November 01, 2001 - February 28, 2007
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal researcher: Marcelo Knobel
• Grantee: Marcelo Knobel
• Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Pesquisadores principais: Carlos Rettori ; Gaston Eduardo Barberis ; Oscar Ferreira de Lima
• Associated grant(s): 06/52642-2 - Pressure temperature phase diagrams of in plane doped cerhin5., AR.EXT; 05/50430-5 - Saul Benjamin Oseroff | San Diego State University - Estados Unidos, AV.EXT; 02/10691-6 - Dan Davidov | The Hebrew University of Jerusalem - Israel, AV.EXT; 02/08075-5 - Saul Benjamim Oseroff | San Diego State University - Estados Unidos, AV.EXT

Abstract

This Research Plan aim at exploring several topics in the study of materials that display properties derived from the strong correlation between charge carriers as well as between magnetic moments. The proponents, which are part of the Physics Institute of UNICAMP, are: Group of Magnetic and Optical Properties of Solids (GPOMS), from the Quantum Electronics Dept. (DEQ) and Laboratory of Materials and Low Temperatures (LMBT), from the Condensed Matter Physics Dept. (DFMC).We propose to carry on studies on several superconducting and magnetic systems, having singlecrystalline, polycrystalline or amorphous structure. The systems that are exclusively magnetic include a variety of materials that can display mixed valence, Kondo lattice, giant magnetoresistance (manganites) and granularity effects at nanometer scale. The systems that are exclusively superconducting include high, as well as low, critical temperature materials, whose electrical, magnetic and optical properties will be studied by us. We plan to study topics on vortex dynamics, factors influencing the critical current, resistive transitions and Hall effect, the gap symmetry, and the effect of magnetic ion substitutions. In particular, the coexistence of superconductivity and ordered magnetic phases will be studied in some materials.We expect to get relevant results that can help us to correlate microscopic and macroscopic properties, by employing current theoretical models as well as developing new ones. In the experimental work we plan to use different sample preparation techniques and several characterization methods, such as: X-ray diffraction, calorimetry, AC and DC resistivity, AC and DC magnetic susceptibility, magnetization, Electronic Paramagnetic Resonance (EPR), microwave absorption, and Raman scattering. Finally, we hope this Project can also contribute to educate well skilled people on the mentioned research areas. (AU)

Scientific publications

(4)

(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)

ADRIANO‚ C.; LORA-SERRANO‚ R.; GILES‚ C.; DE BERGEVIN‚ F.; LANG‚ JC; SRAJER‚ G.; MAZZOLI‚ C.; PAOLASINI‚ L.; PAGLIUSO‚ PG. Magnetic structure of Sm_ {2} IrIn_ {8} determined by x-ray resonant magnetic scattering. Physical Review B, v. 76, n. 10, p. 104515, 2007.

URBANO‚ RR; BITTAR‚ EM; PIRES‚ MA; FERREIRA‚ L.M.; BUFAIÇAL‚ L.; RETTORI‚ C.; PAGLIUSO‚ PG; MAGILL‚ B.; OSEROFF‚ SB; THOMPSON‚ JD; OTHERS. Multiband effects in the electron spin resonance of Gd^{3+} in the intermediate-valence compound YbAl_ {3} and its reference compound LuAl_ {3}. Physical Review B, v. 75, n. 4, p. 045107, 2007.

LORA-SERRANO‚ R.; GILES‚ C.; GRANADO‚ E.; GARCIA‚ DJ; MIRANDA‚ E.; AGÜERO‚ O.; FERREIRA‚ L.M.; DUQUE‚ JGS; PAGLIUSO‚ PG. Magnetic structure and enhanced T_ {N} of the rare-earth intermetallic compound TbRhIn_ {5}: Experiments and mean-field model. Physical Review B, v. 74, n. 21, p. 214404, 2006.

PIRES‚ MA; ISRAEL‚ C.; IWAMOTO‚ W.; URBANO‚ RR; AGÜERO‚ O.; TORRIANI‚ I.; RETTORI‚ C.; PAGLIUSO‚ PG; WALMSLEY‚ L.; LE‚ Z.; OTHERS. Role of oxygen vacancies in the magnetic and dielectric properties of the high-dielectric-constant system CaCu_ {3} Ti_ {4} O_ {12}: An electron-spin resonance study. Physical Review B, v. 73, n. 22, p. 224404, 2006.