210 citations · 1.4k across the 47 of their papers we have counts for
12 papers · 1 filter
Structural and spectroscopic investigation of the charge-ordered, short-range ordered, and disordered phases of the CoOBO ludwigite
C. W. Galdino, D. C. Freitas, C. P. C. Medrano +13
In this work, we investigate the representative case of the homometallic Co ludwigite CoCoOBO ( space group) with four distinct Co crystallographic si…
Avalanche-like metamagnetic transition in (LaNd)CaMnO manganites
L. Ghivelder, G. G. Eslava, R. S. Freitas +2
We investigate the behavior of ultrasharp metamagnetic transitions in La(5/8-y)Nd(y)Ca(3/8)MnO(3) manganites. These compounds change from a low temperature ferromagnetic metallic s…
Coupled magnetic and elastic properties in LaPr(CaSr)MnO manganites
G. G. Eslava, F. Parisi, P. L. Bernardo +4
We investigate a series of manganese oxides, the La0.225Pr0.4(Ca1-xSrx)0.375MnO3 system. The x = 0 sample is a prototype compound for the study of phase separation in manganites, w…
Magnetocaloric effect in manganites: metamagnetic transitions for magnetic refrigeration
M. Quintero, J. Sacanell, L. Ghivelder +3
We present a study of the magnetocaloric effect in La5/8-yPryCa3/8MnO3 (y=0.3) and Pr0.5Ca0.09Sr0.41MnO3 manganites. The low temperature state of both ystems is the result of a com…
Static critical exponents of the ferromagnetic transition in spin glass re-entrant systems
Claudia M. Haetinger, Luis Ghivelder, Jacob Schaf +1
The static critical phenomenology near the Curie temperature of the re-entrant metallic alloys Au_0.81Fe_0.19, Ni_0.78Mn_0.22, Ni_0.79Mn_0.21 and amorphous a-Fe_0.98Zr_0.08 is stud…
Equilibrium tuned by a magnetic field in phase separated manganite
M. Quintero, F. Parisi, G. Leyva +1
We present magnetic and transport measurements on La5/8-yPryCa3/8MnO3 with y = 0.3, a manganite compound exhibiting intrinsic multiphase coexistence of sub-micrometric ferromagneti…
Experimental observation of quantum entanglement in low dimensional spin systems
T. G. Rappoport, L. Ghivelder, J. C. Fernandes +2
We report macroscopic magnetic measurements carried out in order to detect and characterize field-induced quantum entanglement in low dimensional spin systems. We analyze the pyrob…
Dynamic phase separation in La(5/8-y)Pr(y)Ca(3/8)MnO(3)
L. Ghivelder, F. Parisi
Detailed magnetization measurements in La_{5/8-y}Pr_{y}Ca_{3/8} MnO_{3}, including magnetic relaxation properties, demonstrate the dynamic nature of the phase separated state in ma…
Non-volatile magnetoresistive memory in phase separated LaPrCaMnO
P. Levy, F. Parisi, M. Quintero +7
We have measured magnetic and transport response on the polycrystalline LaPrCaMnO (, average grain size 2 microns) compound. In the temperature ra…
Magnetization studies of phase separation in LaCaMnO
R. S. Freitas, L. Ghivelder, P. Levy +1
We present magnetization studies in a series of phase separated LaCaMnO samples, with different low temperature fractions of the ferromagnetic (FM) and charg…
Magnetic relaxation phenomena and cluster glass properties of La{0.7-x}Y{x}Ca{0.3}MnO{3} manganites
R. S. Freitas, L. Ghivelder, F. Damay +2
The dynamic magnetic properties of the distorted perovskite system La{0.7-x}Y{x}Ca{0.3}MnO{3} (0 <= x <= 0.15) have been investigated by ac-susceptibility and dc magnetization meas…
Low-temperature specific heat of La0.78Pb0.22MnO3-d manganite
L. Ghivelder, R. S. Freitas, R. E. Rapp +3
The specific heat of the perovskite manganite La0.78Pb0.22MnO3-d was measured from 0.5 to 25 K. The results yield values of the electronic density of states, the Debye temperature,…