A5051417422- Rare-earth and actinide compounds
- Iron-based superconductors research
- Topological Materials and Phenomena
- Physics of Superconductivity and Magnetism
- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- Superconductivity in MgB2 and Alloys
- Photopolymerization techniques and applications
- Corporate Taxation and Avoidance
- 2D Materials and Applications
- Intellectual Capital and Performance Analysis
Universidade Estadual de Campinas (UNICAMP)
2022-2024
In the ferromagnetic (FM) Weyl semimetal CeAlSi both space-inversion and time-reversal symmetries are broken. Our quantum oscillation (QO) data indicate that FM ordering modifies Fermi-surface topology also leads to an unusual drop in QO amplitude. phase, we find a pressure-induced suppression of anomalous loop Hall effects. This cannot be explained based on electronic band structure or magnetic structure, which nearly pressure independent. Instead, show simplified model describing...
The Weyl semimetal CeAlGe is a promising material to study nontrivial topologies in real and momentum space due the presence of topological magnetic phase. Our results at ambient pressure show that electronic properties are extremely sensitive small stoichiometric variations. In particular, Hall effect (THE) present absent some samples almost identical chemical composition. application external favors antiferromagnetic ground state. It also induces THE where it was not visible pressure....
The polarization dependence of the near edge x-ray absorption spectroscopy (XANES) is an element specific probe to real-space distribution density unoccupied states in solid-state materials. In this paper, we present Fe and As $K$-edge experiments $\mathrm{Ba}{({\mathrm{Fe}}_{1\ensuremath{-}x}{M}_{x})}_{2}{\mathrm{As}}_{2}$ ($M=\mathrm{Mn}$, Co, $x=0.0$ 0.08). reveal a strong probed XANES spectra, which concerns mainly increase intensity electronic transitions when beam set out sample's $ab$...
We present a high-resolution, angle-resolved photoemission spectroscopy study of the normal electronic state superconducting ${\mathrm{NiBi}}_{3}$. Our experimental results show complex Fermi surface structure with many sheets along $\mathrm{\ensuremath{\Gamma}}\text{\ensuremath{-}}X$ and $\mathrm{\ensuremath{\Gamma}}\text{\ensuremath{-}}Y$ directions Brillouin zone. The band presents topological (TSS) at high symmetry $\mathrm{\ensuremath{\Gamma}}$ point Dirac energy $\ensuremath{-}0.185$...
Chemical substitution is commonly used to explore new ground states in materials, yet the role of disorder often overlooked. In Mn-substituted ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$ (MnBFA), superconductivity (SC) absent, despite being observed for nominal hole-doped phases. Instead, a glassy magnetic phase emerges, associated with $S=5/2$ Mn local spins. this work, we present comprehensive investigation electronic structure MnBFA using angle-resolved photoemission spectroscopy (ARPES). We...
For a significant composition range, the suppression of spin density wave transition temperature ( T_{\text{SDW}} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mtext mathvariant="normal">SDW</mml:mtext></mml:msub></mml:math> ) in Cr- and Mn-substituted BaFe _{2} display="inline"><mml:msub><mml:mi/><mml:mn>2</mml:mn></mml:msub></mml:math> As (CrBFA MnBFA, respectively) coincides as function Cr/Mn content, despite distinct electronic...
In the ferromagnetic Weyl semimetal CeAlSi both space-inversion and time-reversal symmetries are broken. We use external pressure as an effective tuning parameter relate three observations to presence of a nontrivial topology in its regime: exceptional temperature response quantum oscillations amplitude, anomalous Hall effect (AHE), existence unusual loop (LHE). find suppression AHE LHE with increasing pressure, while Curie is enhanced. The magnetic structure electronic bands exhibit only...
The Weyl semimetal CeAlGe is a promising material to study nontrivial topologies in real and momentum space due the presence of topological magnetic phase. Our results at ambient pressure show that electronic properties are extremely sensitive small stoichiometric variations. In particular, Hall effect (THE) present absent some samples almost identical chemical composition. application external favors antiferromagnetic ground state. It also induces THE where it was not visible pressure....
Chemical substitution is commonly used to explore new ground states in materials, yet the role of disorder often overlooked. In Mn-substituted BaFe$_{2}$As$_{2}$ (MnBFA), superconductivity (SC) absent, despite being observed for nominal hole-doped phases. Instead, a glassy magnetic phase emerges, associated with $S=5/2$ Mn local spins. this work, we present comprehensive investigation electronic structure MnBFA using angle-resolved photoemission spectroscopy (ARPES). We find that causes...
The absence of superconductivity (SC) in Cr-substituted BaFe$_{2}$As$_{2}$ (CrBFA) is a well-established but poorly understood topic. It also established that the suppression spin density wave transition temperature ($T_{\text{SDW}}$) CrBFA and Mn-substituted (MnBFA) almost coincides as function Cr/Mn concentrations, irrespective putative distinct electronic effects these substitutions. In this work, we employ angle-resolved photoemission spectroscopy (ARPES) combined functional theory plus...