33 citations · 255 across the 24 of their papers we have counts for
21 papers
Uniaxial stress tuning of the anomalous Hall effect in Mn3Ge
G. A. Lombardi, L. O. Kutelak, M. M. Piva +6
Tunable electronic properties in magnetic materials lead to novel physical phenomena that have the potential to be exploited in the design of new spintronic devices. Here, we repor…
Importance of the semimetallic state for the quantum Hall effect in HfTe
M. M. Piva, R. Wawrzyńczak, Nitesh Kumar +5
At ambient pressure, HfTe is a material at the boundary between a weak and a strong topological phase, which can be tuned by changes in its crystalline structure or by the ap…
Superconducting pairing symmetry in MoTe
M. M. Piva, L. O. Kutelak, R. Borth +4
Topological superconductors have long been sought for their potential use in quantum computing. The type-II Weyl semimetal MoTe is an obvious candidate, exhibiting a supercon…
Observation of the anomalous Hall effect in a layered polar semiconductor
Seo-Jin Kim, Jihang Zhu, Mario M. Piva +10
Progress in magnetoelectric materials is hindered by apparently contradictory requirements for time-reversal symmetry broken and polar ferroelectric electronic structure in common…
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…
Effects of external pressure on the narrow gap semiconductor CeCdAs
M. M. Piva, L. Xiang, J. D. Thompson +4
Here we report the magnetic and electronic properties of recently discovered CeCdAs. At ambient pressure, CeCdAs presents a semiconducting behav…
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…
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…
The planar triangular magnet AgCrSe: magnetic frustration, short range correlations, and field tuned anisotropic cycloidal magnetic order
M. Baenitz, M. M. Piva, S. Luther +25
Our studies evidence an anisotropic magnetic order below ~K. Susceptibility data in small fields of about 1~T reveal an antiferromagnetic (AFM) order for , whe…
Robust narrow-gap semiconducting behavior in square-net LaCdAs
Mario M. Piva, Marein C. Rahn, Sean M. Thomas +6
ABSTRACT: Narrow-gap semiconductors are sought-after materials due to their potential for long-wavelength detectors, thermoelectrics, and more recently non-trivial topology. Here w…
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…
Competition between electronic correlations and hybridization in CaMnBi
Christopher Lane, M. M. Piva, P. F. S. Rosa +1
We study the interplay between electronic correlations and hybridization in the low-energy electronic structure of CaMnBi, a candidate hybridization-gap semiconductor. Util…
CeAuBi: a new nonsymmorphic antiferromagnetic compound
M. M. Piva, W. Zhu, F. Ronning +3
Here we report the structural and electronic properties of CeAuBi, a new heavy-fermion compound crystallizing in a nonsymmorphic hexagonal structure (). The Ce$^{3+}…
Putative hybridization gap in CaMnBi under applied pressure
M. M. Piva, S. M. Thomas, Z. Fisk +4
We report electrical transport measurements on CaMnBi single crystals under applied pressure. At ambient pressure and high temperatures, CaMnBi behaves as a…
Anisotropic magnetic excitations and incipient Néel order in Ba(FeMn)As
Fernando A. Garcia, Oleh Ivashko, Daniel E. McNally +7
It is currently understood that high temperature superconductivity (SC) in the transition metal substituted iron arsenides Ba(Fe)As is promoted b…
Pressure effects on the structural and superconducting transitions in La3Co4Sn13
L. Mendonça-Ferreira, F. B. Carneiro, M. B. Fontes +8
La3Co4Sn13 is a superconducting material with transition temperature at Tc = 2.70 K, which presents a superlattice structural transition at T* ~ 150 K, a common feature for this cl…
Magnetotransport properties in the magnetic phase of BaFeTAs (T = Co,Ni): A magnetic excitations approach
J. P. Peña, M. M. Piva, P. F. S. Rosa +6
Because of their complex Fermi surfaces, the identification of the physical phenomena contributing to electronic scattering in the Fe-based superconductors is a difficult task. Her…
The role of magnetic excitations in magnetoresistance and Hall effect of slightly TM-substituted BaFeAs compounds (TM = Mn, Cu, Ni)
J. P. Peña, M. M. Piva, C. B. R. Jesus +10
We report on electrical resistivity, magnetoresistance (MR) and Hall effect measurements in four non-superconducting BaFeTMAs (TM = Mn, Cu and Ni) single crystals w…
Possible unconventional superconductivity in substituted BaFeAs revealed by magnetic pair-breaking studies
P. F. S. Rosa, C. Adriano, T. M. Garitezi +8
The possible existence of a sign-changing gap symmetry in BaFeAs-derived superconductors (SC) has been an exciting topic of research in the last few years. To further i…