J
J. F. Oliveira
Publications - 5
Citations - 54
J. F. Oliveira is an academic researcher. The author has contributed to research in topics: Mott transition & Phase transition. The author has an hindex of 3, co-authored 5 publications receiving 28 citations.
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Journal ArticleDOI
Pressure-induced Anderson-Mott transition in elemental tellurium
J. F. Oliveira,M. B. Fontes,Marcus V. O. Moutinho,S. E. Rowley,Elisa Baggio-Saitovitch,Marcello B. Silva Neto,Carsten Enderlein +6 more
TL;DR: In this paper, it was shown that a high-quality tellurium single crystal undergoes a quantum phase transition at low temperatures from an Anderson insulator to a correlated disordered metal at around 17 kbar.
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Magnetic, electronic, structural, and thermal properties of the Co 3 O 2 BO 3 ludwigite in the paramagnetic state
C. W. Galdino,D. C. Freitas,C. P. C. Medrano,R. Tartaglia,D. Rigitano,J. F. Oliveira,A. A. Mendonça,Luis Ghivelder,Mucio A. Continentino,D. R. Sanchez,E. Granado +10 more
TL;DR: The mixed-valent homometallic ludwigite was investigated in this paper and phase transitions associated with changes in the Co oxidation state in each of its four crystallographic sites were observed.
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Quantum percolation phase transition and magnetoelectric dipole glass in hexagonal ferrites
S. E. Rowley,Thomas Vojta,A. T. Jones,A. T. Jones,W. Guo,J. F. Oliveira,Finlay D. Morrison,N. Lindfield,E. Baggio Saitovitch,Bernard Enrico Watts,James F. Scott +10 more
TL;DR: In this paper, the authors reported the results of tuning the magnetic ordering temperature in hexagonal ferrites to zero by chemical substitution and found that this produces a form of compositionally tuned, insulating, ferrimagnetic quantum criticality.
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Magnon excitations and quantum critical behavior of the ferromagnet U 4 Ru 7 Ge 6
M. P. Nascimento,Mucio A. Continentino,A. López,Ana de Leo,D. C. Freitas,J. Larrea,Carsten Enderlein,J. F. Oliveira,E. M. Baggio-Saitovitch,Jiří Pospíšil,M. B. Fontes +10 more
TL;DR: In this paper, an extensive study of the ferromagnetic heavy-fermion compound (U) was performed and the authors showed that the low-temperature magnetic behavior of this soft ferromagnet is dominated by the excitation of gapless spin-wave modes.
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The pressure-dependence of the band gap of tellurium
TL;DR: In this paper, the authors present a pressure dependent study of the gap size of tellurium up to 22kbar, studied by temperature dependent electrical transport and identify the gap sizes to be still well above 100 meV at their maximum pressure.