| Grant number: | 11/22050-4 |
| Support Opportunities: | Regular Research Grants |
| Start date: | April 01, 2012 |
| End date: | March 31, 2014 |
| Field of knowledge: | Physical Sciences and Mathematics - Physics - Condensed Matter Physics |
| Principal Investigator: | Valdeci Pereira Mariano de Souza |
| Grantee: | Valdeci Pereira Mariano de Souza |
| Host Institution: | Instituto de Geociências e Ciências Exatas (IGCE). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil |
Abstract
The main objective of this project is theexploration and understanding of the thermodynamic and transportproperties of strongly correlated electrons systems. For thispurpose, it is planned the acquisition of a cryo-free 4Hecryostat. The latter will be equipped with a sample holder, which inturn is attached to a closed cycle 3He system. This setup willenable to perform experiments in the temperature range 0.3 - 300 Kat magnetic fields up to 12 T. In a first stage, experimental setsfor resistivity, dielectric constant and pyroelectric coefficientwill be installed in this cryostat. Materials of interest include i) the recently discovered iron-based superconductors andii) charge-transfer salts. For the Fe-based superconductors,a remarkable aspect refers to the intricate interplay betweenmagnetic ordering of Fe-3d moments, the structural phasetransition observed in underdoped samples and the superconductingdome. The possibility of preparing new materials of this family withhigher Tc than that achieved in the present (Tc = 55 K)constitute a topic of particular interest in the literature.Charge-transfer salts offer an unique possibility of studyingelectronic correlation phenomena in a "clean" environment, sincethe various phases can be tuned by means of chemical pressure and/orapplication of external pressure. Various fundamental aspects, forinstance, a detailed investigation of the transport properties ofthe pure hexagonal phase of FeSe_1-x, as well as the explorationof the charge-ordered phase in charge-transfer salts are planned. Aclose collaboration is intended with research groups in Brazil andabroad. (AU)
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