33 citations · 175 across the 18 of their papers we have counts for
18 papers
Evidence for a field-induced Lifshitz transition in the Weyl semimetal CeAlSi
M. M. Piva, T. Helm, J. C. Souza +4
The Weyl semimetal CeAlSi crystallises in the noncentrosymmetric tetragonal space group and exhibits ferromagnetic order below 8 K, thereby breaking both spatial inversion…
Tuning the topological character of half-Heusler systems: A comparative study on YBi ( = Pd, Pt)
J. C. Souza, M. V. Ale Crivillero, H. Dawczak-Dębicki +3
Half-Heusler systems host a plethora of different ground states, especially with non-trivial topology. However, there is still a lack of spectroscopic insight into the correspondin…
Topological Hall effect in CeAlGe
M. M. Piva, J. C. Souza, G. A. Lombardi +4
The Weyl semimetal CeAlGe is a promising material to study nontrivial topologies in real and momentum space due to the presence of a topological magnetic phase. Our results at ambi…
Topological features in the ferromagnetic Weyl semimetal CeAlSi: Role of domain walls
M. M. Piva, J. C. Souza, V. Brousseau-Couture +8
In the ferromagnetic (FM) Weyl semimetal CeAlSi both space-inversion and time-reversal symmetries are broken. Our quantum oscillation (QO) data indicate that the FM ordering modifi…
Magnetic interactions of 4 electrons in the topological insulator chalcogenide BiSe
J. C. Souza, M. Carlone, G. G. Lesseux +5
The gap opening mechanism of a topological insulator, the quantum anomalous Hall effect and the axion physics are still pressing open questions and a microscopic viewpoint to furth…
Slow crystalline electric field fluctuations in the Kondo lattice SmB
M. Carlone, J. C. Souza, J. Sichelschmidt +7
This work reports on the temperature dependence of the electron spin resonance (ESR) of Gd-doped SmB single crystals at X- and Q-band microwave frequencies in differen…
Orbital localization and the role of the Fe and As orbitals in BaFeAs probed by XANES
A. G. de Figueiredo, M. R. Cantarino, W. R. da Silva Neto +9
The polarization dependence of the near edge x-ray absorption spectroscopy (XANES) is an element specific probe to the real-space distribution of the density of unoccupied states i…
Microscopic probe of magnetic polarons in antiferromagnetic EuInSb
J. C. Souza, S. M. Thomas, E. D. Bauer +4
Colossal magnetoresistance (CMR) emerges from intertwined spin and charge degrees of freedom in the form of ferromagnetic clusters also known as trapped magnetic polarons. As a res…
Tuning the nontrivial topological properties of the Weyl semimetal CeAlSi
M. M. Piva, J. C. Souza, V. Brousseau-Couture +6
In the ferromagnetic Weyl semimetal CeAlSi both space-inversion and time-reversal symmetries are broken. We use external pressure as an effective tuning parameter and relate three…
Surface excitations relaxation in the Kondo insulator SmGdB
J. C. Souza, M. König, M. V. Ale Crivillero +7
The interplay between non-trivial topological states of matter and strong electronic correlations is one of the most compelling open questions in condensed matter physics. Due to e…
Systematic manipulation of the surface conductivity of SmB
M. Victoria Ale Crivillero, M. König, J. C. Souza +5
We show that the resistivity plateau of SmB at low temperature, typically taken as a hallmark of its conducting surface state, can systematically be influenced by different sur…
Quantum Criticality in a Layered Iridate
Kousik Samanta, Jean C. Souza, Danilo Rigitano +3
Iridates provide a fertile ground to investigate correlated electrons in the presence of strong spin-orbit coupling. Bringing these systems to the proximity of a metal-insulator qu…
Hyperfine Couplings as a Probe of Orbital Anisotropy in Heavy Fermion Materials
P. Menegasso, J. C. Souza, I. Vinograd +5
The transferred hyperfine interaction between nuclear and electron spins in an heavy fermion material depends on the hybridization between the -electron orbitals and those surro…
Metallic islands in the Kondo insulator SmB
J. C. Souza, P. F. S. Rosa, J. Sichelschmidt +7
The predicted interplay between Kondo physics and non-trivial topology in SmB has stimulated many experimental reports, some of which are in apparent contradiction. The origi…
Tuning the crystalline electric field and magnetic anisotropy along the CeCuBiSb series
G. S. Freitas, M. M. Piva, R. Grossi +8
We have performed X-ray powder diffraction, magnetization, electrical resistivity, heat capacity and inelastic neutron scattering (INS) to investigate the physical properties of th…
Electronic and magnetic properties of stoichiometric CeAuBi
M. M. Piva, R. Tartaglia, G. S. Freitas +13
We report the electronic and magnetic properties of stoichiometric CeAuBi single crystals. At ambient pressure, CeAuBi orders antiferromagnetically below a Néel tempera…
Colossal magnetoresistance in a nonsymmorphic antiferromagnetic insulator
P. F. S. Rosa, Yuanfeng Xu, S. K. Kushwaha +14
Here we investigate antiferromagnetic EuInSb, a nonsymmorphic Zintl phase. Our electrical transport data show that EuInSb is remarkably insulati…
Revisiting the Possible 4f7 5d1 Ground State of Gd Impurities in SmB6 by Electron Spin Resonance
J. C. Souza, P. F. S. Rosa, U. Burkhardt +5
The search for topological states in strongly correlated electron systems has renewed the interest in the Kondo insulator SmB6. One of the most intriguing previous results was an a…