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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Putative hybridization gap in CaMn2Bi2 under applied pressure

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Piva, M. M. [1, 2] ; Thomas, S. M. [1] ; Fisk, Z. [3] ; Zhu, J-X [1] ; Thompson, J. D. [1] ; Pagliuso, P. G. [2] ; Rosa, P. F. S. [1]
Total Authors: 7
[1] Los Alamos Natl Lab, Los Alamos, NM 87545 - USA
[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
[3] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92967 - USA
Total Affiliations: 3
Document type: Journal article
Source: Physical Review B; v. 100, n. 4 JUL 8 2019.
Web of Science Citations: 1

We report electrical transport measurements on CaMn2Bi2 single crystals under applied pressure. At ambient pressure and high temperatures, CaMn2Bi2 behaves as a single-band semimetal hosting Neel order at T-N = 150 K. At low temperatures, multiband behavior emerges along with an activated behavior typical of degenerate semiconductors. The activation gap is estimated to be Delta similar to 20 K. Applied pressure not only favors the antiferromagnetic order at a rate of 0.40(2) K/kbar, but it also enhances the activation gap at 20 kbar by about 70%. This gap enhancement is typical of correlated narrow-gap semiconductors such as FeSi and Ce3Bi4Pt3, and it places CaMn2Bi2 as a Mn-based hybridization-gap semiconductor candidate. Ab initio calculations based on density functional theory are shown to be insufficient to describe the ground state of CaMn2Bi2. (AU)

FAPESP's process: 17/10581-1 - Emergent phenomena in reduced dimension systems
Grantee:Pascoal Jose Giglio Pagliuso
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/15665-3 - Studies of orbital differentiation effects in the magnetic and superconducting properties of FeAs based compounds
Grantee:Mário Moda Piva
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 17/25269-3 - High pressure studies in SrFe2As2, CaMn2Bi2 and CeAuBi2 compounds
Grantee:Mário Moda Piva
Support type: Scholarships abroad - Research Internship - Doctorate (Direct)