Studies of orbital differentiation effects in the magnetic and superconducting properties of FeAs based compounds

• Grant number: 15/15665-3
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: November 01, 2015
• End date: December 31, 2019
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Pascoal Jose Giglio Pagliuso
• Grantee: Mário Moda Piva
• Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated scholarship(s): 17/25269-3 - High pressure studies in SrFe2As2, CaMn2Bi2 and CeAuBi2 compounds, BE.EP.DD

Abstract

The first iron based superconductor found was the La(O1-xFx)As in 2008. Although of its relative low transition temperature (Tc) of 26 K, the finding of this new compound opened a new path for superconductivity in such a way that the FeAs based superconductors are broadly discussed in the scientific community until the present days. Compounds with a Tc as high as 56 K can be synthesized by the self-flux or tin-flux technique today. However, the first provides a great risk to the grower, due to the As excess. In the latter case, there is tin incorporation in the single crystals, which results in low quality samples. Therefore, this project aims to explore the In-flux technique to synthesize single crystalline samples of the family AFe2As2 (122) (A = Ba, Sr e Ca). Previous works have already shown the efficiency of this technique in the synthesis of high quality single crystals of the BaFe2As2 compound. The AFe2As2 (A = Ba, Sr e Ca) single crystals will be studied by combined experiments of several macroscopic techniques (as resistivity, specific heat and magnetic susceptibility) and microscopic (ESR and NMR). These studies seek a generalization of the understanding of the Fe 3d orbital occupation in the FeAs compounds as a function of the Fe-As distance, in all the families with similar structures, and its relation to the suppression of the spin density wave phase and the induction of the superconducting state. With these experiments, a more general understanding of the role of the orbital differentiation in the microscopic of the pairing mechanism in these systems will be achieved. (AU)

Scientific publications

(17)

(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)

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.; et al. Electronic and magnetic properties of stoichiometric CeAuBi2. Physical Review B, v. 101, n. 21, JUN 18 2020. (17/10581-1, 19/04196-3, 17/25269-3, 15/15665-3, 18/11364-7)

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.; et al. Tuning the crystalline electric field and magnetic anisotropy along the CeCuBi2-xSbx series. Physical Review B, v. 102, n. 15, OCT 20 2020. (17/10581-1, 17/25269-3, 18/11364-7, 15/16191-5, 19/04196-3, 15/15665-3, 19/26247-9)

CHRISTOVAM, D. S.; FREITAS, G. S.; PIVA, M. M.; SOUZA, J. C.; MALCOLMS, M. O.; CANTON, O. L.; LEAO, J. B.; RATCLIFF, W.; LYNN, J. W.; ADRIANO, C.; et al. Evolution of the magnetic properties in the antiferromagnet Ce2RhIn8 simultaneously doped with Cd and Ir. Physical Review B, v. 102, n. 19, NOV 20 2020. (19/04196-3, 06/60440-0, 18/11364-7, 17/10581-1, 09/09247-3, 19/26247-9, 18/26512-1, 15/15665-3)

PIVA, MARIO M.; RAHN, MAREIN C.; THOMAS, SEAN M.; SCOTT, BRIAN L.; PAGLIUSO, PASCOAL G.; THOMPSON, JOE D.; SCHOOP, LESLIE M.; RONNING, FILIP; ROSA, PRISCILA F. S.. Robust Narrow-Gap Semiconducting Behavior in Square-Net La3Cd2As6. CHEMISTRY OF MATERIALS, v. 33, n. 11, p. 4122-4127, JUN 8 2021. (17/10581-1, 15/15665-3)

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. (17/10581-1, 12/04870-7, 15/15665-3, 12/05903-6, 17/25269-3)

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. (17/10581-1, 15/15665-3, 17/25269-3)

DE FIGUEIREDO, A. G.; CANTARINO, M. R.; NETO, W. R. DA SILVA; PAKUSZEWSKI, K. R.; GROSSI, R.; CHRISTOVAM, D. S.; SOUZA, J. C.; PIVA, M. M.; FREITAS, G. S.; PAGLIUSO, P. G.; et al. Orbital localization and the role of the Fe and As 4p orbitals in BaFe2As2 probed by XANES. Physical Review B, v. 105, n. 4, JAN 21 2022. (17/10581-1, 18/11364-7, 19/05150-7, 15/15665-3, 20/12283-0, 20/13701-0, 19/23879-4, 19/04196-3)

KANEKO, U. F.; PIVA, M. M.; JESUS, C. B. R.; SALETA, M. E.; URBANO, R. R.; PAGLIUSO, P. G.; GRANADO, E.. Evidence of precursor orthorhombic domains well above the electronic nematic transition temperature in Sr(Fe1-xCox)(2)As-2. JOURNAL OF PHYSICS-CONDENSED MATTER, v. 31, n. 49, DEC 11 2019. (17/10581-1, 15/15665-3)

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, p. 7-pg., 2019-03-14. (15/15665-3, 17/10581-1, 17/25269-3)

LANE, CHRISTOPHER; PIVA, M. M.; ROSA, P. F. S.; ZHU, JIAN-XIN. Correlation versus hybridization gap in CaMn2Bi2. SCIENTIFIC REPORTS, v. 13, n. 1, p. 8-pg., 2023-06-07. (17/25269-3, 17/10581-1, 15/15665-3)

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.; et al. Tuning the crystalline electric field and magnetic anisotropy along the CeCuBi2-xSbx series. PHYSICAL REVIEW B, v. 102, n. 15, p. 7-pg., 2020-10-20. (15/16191-5, 17/25269-3, 17/10581-1, 18/11364-7, 19/26247-9, 15/15665-3, 19/04196-3)

CHRISTOVAM, D. S.; FREITAS, G. S.; PIVA, M. M.; SOUZA, J. C.; MALCOLMS, M. O.; CANTON, O. L.; LEAO, J. B.; RATCLIFF, W.; LYNN, J. W.; ADRIANO, C.; et al. Evolution of the magnetic properties in the antiferromagnet Ce2RhIn8 simultaneously doped with Cd and Ir. PHYSICAL REVIEW B, v. 102, n. 19, p. 9-pg., 2020-11-20. (18/26512-1, 06/60440-0, 17/10581-1, 09/09247-3, 18/11364-7, 19/26247-9, 15/15665-3, 19/04196-3)

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, p. 7-pg., 2019-07-08. (17/25269-3, 17/10581-1, 15/15665-3)

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. (15/15665-3, 17/10581-1, 17/25269-3)

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. (15/15665-3, 17/25269-3, 17/10581-1)

PIVA, M. M.; XIANG, L.; THOMPSON, J. D.; BUD'KO, S. L.; RIBEIRO, R. A.; CANFIELD, P. C.; ROSA, P. F. S.. Effects of external pressure on the narrow-gap semiconductor Ce3Cd2As6. PHYSICAL REVIEW B, v. 105, n. 9, p. 7-pg., 2022-03-30. (17/25269-3, 15/15665-3, 17/10581-1)

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.; et al. Electronic and magnetic properties of stoichiometric CeAuBi2. PHYSICAL REVIEW B, v. 101, n. 21, p. 7-pg., 2020-06-18. (18/11364-7, 15/15665-3, 19/04196-3, 17/25269-3, 17/10581-1)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

PIVA, Mário Moda. Novos materiais complexos sob pressão. 2019. Doctoral Thesis - Universidade Estadual de Campinas (UNICAMP). Instituto de Física Gleb Wataghin Campinas, SP.