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High pressure studies in SrFe2As2, CaMn2Bi2 and CeAuBi2 compounds

Grant number: 17/25269-3
Support type:Scholarships abroad - Research Internship - Doctorate (Direct)
Effective date (Start): April 23, 2018
Effective date (End): April 22, 2019
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal researcher:Pascoal Jose Giglio Pagliuso
Grantee:Mário Moda Piva
Supervisor abroad: Joe D. Thompson
Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Research place: Los Alamos National Laboratory, United States  
Associated to the scholarship:15/15665-3 - Studies of orbital differentiation effects in the magnetic and superconducting properties of FeAs based compounds, BP.DD


In many compounds, including the cuprates, the Fe-based and the heavy-fermion superconductors, the suppression of a magnetic order leads to unusual ground states such as unconventional superconductivity and non-Fermi-liquid states. These ground states can be tuned by chemical substitution, magnetic fields, uniaxial strain, and applied hydrostatic pressure. In particular, applied pressure is an ideal non-symmetric-breaking tuning parameter, as there is no introduction of disorder in the system. Therefore, the application of external pressure is a desirable route to suppress magnetic ordered states and induce novel ground states. This project proposes to explore this route by means of electrical resistivity and AC calorimetry experiments under high pressures (~10 GPa) and low temperatures (~300 mK) for SrFe2As2, CaMn2Bi2 and CeAuBi2. All compounds order antiferromagnetically at 204 K, 150 K and 12 K, respectively. The first is a Fe-based superconductor, in which high pressure experiments will shed new light on the relation of structural distortions and the appearance of superconductivity. The latter two are new materials in which the suppression of the antiferromagnetic order may lead to unusual ground states. It is worth mentioning that the experiments performed at the Los Alamos National Laboratory (LANL) will reach ranges of temperature and pressure which cannot be achieved at our group in Brazil. Also, LANL is one of the most renowned laboratories in the world, performing cutting-edge scientific research, and Prof. Dr. Joe D. Thompson is a world-renowned expert in experiments under high pressures, with an extensive list of high impact publications and numerous citations. Moreover, Dr. Priscila Rosa is also a great expert in experiments under high pressures and will help in my supervision. Therefore, this internship abroad will allow the advancement of the results acquired in my project to ranges that cannot be achieved at my research group. This internship also will provide the knowledge of several experimental techniques, such as AC calorimetry under pressure, which I intend to perform at my research group afterwards. Further, this project will strengthen the collaboration between UNICAMP and LANL, and provide a successful route for the exchange of students. In this regard, this internship will bring an extensive list of benefits to me and to my group in Brazil, which are of great value to the development of my academic life and science in Brazil. (AU)

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Scientific publications (6)
(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)
FREITAS, G. S.; PIVA, M. M.; GROSSI, R.; JESUS, C. B. R.; SOUZA, J. C.; CHRISTOVAM, D. S.; OLIVEIRA, N. F.; LEAO, J. B.; ADRIANO, C.; LYNN, J. W.; PAGLIUSO, P. G. Tuning the crystalline electric field and magnetic anisotropy along the CeCuBi2-xSbx series. Physical Review B, v. 102, n. 15 OCT 20 2020. Web of Science Citations: 0.
PIVA, M. M.; TARTAGLIA, R.; FREITAS, G. S.; SOUZA, J. C.; CHRISTOVAM, D. S.; THOMAS, S. M.; LEAO, J. B.; RATCLIFF, W.; LYNN, J. W.; LANE, C.; ZHU, J-X; THOMPSON, J. D.; ROSA, P. F. S.; ADRIANO, C.; GRANADO, E.; PAGLIUSO, P. G. Electronic and magnetic properties of stoichiometric CeAuBi2. Physical Review B, v. 101, n. 21 JUN 18 2020. Web of Science Citations: 0.
PIVA, M. M.; ZHU, W.; RONNING, F.; THOMPSON, J. D.; PAGLIUSO, P. G.; ROSA, P. F. S. CeAu2Bi: A new nonsymmorphic antiferromagnetic compound. PHYSICAL REVIEW MATERIALS, v. 3, n. 7 JUL 23 2019. Web of Science Citations: 0.
PIVA, M. M.; THOMAS, S. M.; FISK, Z.; ZHU, J-X; THOMPSON, J. D.; PAGLIUSO, P. G.; ROSA, P. F. S. Putative hybridization gap in CaMn2Bi2 under applied pressure. Physical Review B, v. 100, n. 4 JUL 8 2019. Web of Science Citations: 1.
GARCIA, FERNANDO A.; IVASHKO, OLEH; MCNALLY, DANIEL E.; DAS, LAKSHMI; PIVA, MARIO M.; ADRIANO, C.; PAGLIUSO, PASCOAL G.; CHANG, JOHAN; SCHMITT, THORSTEN; MONNEY, CLAUDE. Anisotropic magnetic excitations and incipient Neel order in Ba(Fe1-xMnx)(2)As-2. Physical Review B, v. 99, n. 11 MAR 14 2019. Web of Science Citations: 1.
PIVA, M. M.; AJEESH, M. O.; CHRISTOVAM, D. S.; DOS REIS, R. D.; JESUS, C. B. R.; ROSA, P. F. S.; ADRIANO, C.; URBANO, R. R.; NICKLAS, M.; PAGLIUSO, P. G. High-pressure studies on heavy-fermion antiferromagnet CeCuBi2. JOURNAL OF PHYSICS-CONDENSED MATTER, v. 30, n. 37 SEP 19 2018. Web of Science Citations: 0.

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