533 citations · 3.2k across the 59 of their papers we have counts for
23 papers · 1 filter
YNiSn: A candidate Dirac semimetal
G. S. Freitas, C. Kaufmann Ribeiro, F. B. Carneiro +16
We report the synthesis and physical properties of the new compound YNiSn, which crystallizes in the orthorhombic \textit{Cmcm} structure. The material exhibits semimetallic be…
Anomalous Hall Effect in Bismuth
Bruno Camargo, Piort Gierlowski, Andrei Alaferdov +4
We report the occurrence of ferromagnetic-like anomalous Hall effect (AHE) below mT in bismuth single and policrystals. The signatures of ferromagnetism in transport are not c…
Bosonic topological insulator intermediate state in the superconductor-insulator transition
M. C. Diamantini, A. Yu. Mironov, S. V. Postolova +7
A low-temperature intervening metallic regime arising in the two-dimensional superconductor-insulator transition challenges our understanding of electronic fluids. Here we develop…
Comment on: "Revealing common artifacts due to ferromagnetic inclusions in highly oriented pyrolytic graphite", by M. Sepioni, R.R. Nair, I.-Ling Tsai, A.K. Geim and I.V. Grigorieva, EPL 97 (2012) 47001
D. Spemann, M. Rothermel, P. Esquinazi +3
This comment addresses several issues in the paper by Sepioni et al., where it is stated that the ferromagnetism in pristine highly oriented pyrolytic graphite (HOPG) reported by s…
Nernst effect and dimensionality in the quantum limit
Zengwei Zhu, Huan Yang, Benoit Fauque +2
Nernst effect, the transverse voltage generated by a longitudinal thermal gradient in presence of magnetic field has recently emerged as a very sensitive, yet poorly understood, pr…
Signatures of Electron Fractionalization in Ultraquantum Bismuth
Kamran Behnia, Luis Balicas, Yakov Kopelevich
Because of the long Fermi wavelength of itinerant electrons, the quantum limit of elemental bismuth (unlike most metals) can be attained with a moderate magnetic field. The quantiz…
Charge Ordering in Amorphous WO Films
Yakov Kopelevich, Robson R. da Silva, Aline Rougier +1
We report on the observation of highly anisotropic viscous electronic conducting phase in amorphous WO films that occurs below a current (I)- and frequency (f)- dependent…
Oscillating Nernst-Ettingshausen effect in Bismuth across the quantum limit
Kamran Behnia, Marie-Aude Measson, Yakov Kopelevich
In elemental Bismuth, 10 atoms share a single itinerant electron. Therefore, a moderate magnetic field can confine electrons to the lowest Landau level. We report on the first…
Nernst effect in semi-metals: the meritorious heaviness of electrons
Kamran Behnia, Marie-Aude Measson, Yakov Kopelevich
We present a study of electric, thermal and thermoelectric transport in elemental Bismuth, which presents a Nernst coefficient much larger than what was found in correlated metals.…
First direct observation of Dirac fermions in graphite
S. Y. Zhou, G. -H. Gweon, J. Graf +7
Originating from relativistic quantum field theory, Dirac fermions have been recently applied to study various peculiar phenomena in condensed matter physics, including the novel q…
Ferromagnetic and superconducting instabilities in graphite
Y. Kopelevich, S. Moehlecke, R. R. da Silva
We review our recent work on magnetic properties of graphite and related carbon materials. The results demonstrate that a structural disorder, topological defects, as well as adsor…
Anomalous Hall Effect in Graphite
Y. Kopelevich, J. C. Medina Pantoja, R. R. da Silva +2
We report on the experimental observation of an anomalous Hall effect (AHE) in highly oriented pyrolytic graphite samples. The overall data indicate that the AHE in graphite can be…
Universal Magnetic-Field-Driven Metal-Insulator-Metal Transformations in Graphite and Bismuth
Y. Kopelevich, J. C. Medina Pantoja, R. R. da Silva +1
Applied magnetic field induces metal - insulator and re-entrant insulator-metal transitions in both graphite and rhombohedral bismuth. The corresponding transition boundaries plott…
Phase analysis of quantum oscillations in graphite
Igor A. Luk'yanchuk, Yakov Kopelevich
The quantum de Haas van Alphen (dHvA) and Shubnikov de Haas (SdH) oscillations measured in graphite were decomposed by pass-band filtering onto contributions from three different g…
Local Ferromagnetism in Microporous Carbon with the Structural Regularity of Zeolite Y
Y. Kopelevich, R. R. da Silva, J. H. S. Torres +2
Magnetization M(H,T) measurements have been performed on microporous carbon (MC) with a three-dimensional nano-array structure corresponding to that of a zeolite Y supercage. The o…
Magnetothermal Conductivity of Highly Oriented Pyrolytic Graphite in the Quantum Limit
R. Ocaña, P. Esquinazi, H. Kempa +2
We report on the magnetic field (0TT) dependence of the longitudinal thermal conductivity of highly oriented pyrolytic graphite in the temperature range 5 K…
Metal-Insulator-Metal Transitions, Superconductivity and Magnetism in Graphite
Y. Kopelevich, P. Esquinazi, J. H. S. Torres +4
This article reviews recent results of magnetotransport and magnetization measurements performed on highly oriented pyrolitic graphite (HOPG) and single crystalline Kish graphite s…
Landau Level Quantization and Possible Superconducting Instabilities in Highly Oriented Pyrolitic Graphite
Y. Kopelevich, V. V. Lemanov, S. Moehlecke +1
Measurements of the basal-plane resistivity rho_a(T,H) performed on highly oriented pyrolitic graphite, with magnetic field H parallel to the c-axis in the temperature interval 2 -…
Reentrant Metallic Behavior of Graphite in the Quantum Limit
Y. Kopelevich, J. H. S. Torres, R. R. da Silva +3
Magnetotransport measurements performed on several well-characterized highly oriented pyrolitic graphite and single crystalline Kish graphite samples reveal a reentrant metallic be…
Field-induced metal-insulator Field-induced metal-insulator transition in the c-axis resistivity of graphite
H. Kempa, P. Esquinazi, Y. Kopelevich
We show that the resistivity perpendicular and parallel to the basal planes of different graphite samples show similar magnetic-field-driven metal-insulator-transitions…
Ferromagnetism in Oriented Graphite Samples
P. Esquinazi, A. Setzer, R. Hoehne +6
We have studied the magnetization of various, well characterized samples of highly oriented pyrolitic graphite (HOPG), Kish graphite and natural graphite to investigate the recentl…
Magnetic-Field-Driven Superconductor-Insulator-Type Transition in Graphite
H. Kempa, Y. Kopelevich, F. Mrowka +4
A magnetic-field-driven transition from metallic- to semiconducting-type behavior in the basal-plane resistance takes place in highly oriented pyrolytic graphite at a field $H_c \s…
Ferromagnetic- and Superconducting-like Behavior of Graphite
Y. Kopelevich, P. Esquinazi, J. H. S. Torres +1
We have identified ferromagnetic- and superconducting-like magnetization hysteresis loops in highly oriented pyrolytic graphite samples below and above room temperature. We also fo…