F.G. Chang
Henan Normal University
Charge carrierHigh-temperature superconductivityMagnetic fieldCrystal structureAnalytical chemistryMultiferroicsDielectricCeramicNéel temperaturePhase transitionRemanenceAntiferromagnetismVoltageMagnetic structureAndreev reflectionPhase boundaryField (physics)Materials scienceBiasingFerromagnetic material propertiesCondensed matter physicsProximity effect (superconductivity)MagnetizationAtmospheric temperature rangeNuclear magnetic resonanceMagnetic hysteresisOptoelectronicsLaserSuperconductivityMetalPolarity reversalCrystalOpen-circuit voltageDopingElectric fieldPhotovoltaic effectShort circuitResistive touchscreenElectrical resistivity and conductivityFerroelectricityHeterojunctionFerromagnetismBlue laserDielectric lossPolarity (physics)
8Publications
4H-index
58Citations
Publications 8
Newest
#1G.L. Song (Henan Normal University)H-Index: 3
#2J. Su (Henan Normal University)H-Index: 3
Last. F.G. Chang (Henan Normal University)H-Index: 4
view all 8 authors...
Abstract In the present study, crystal structural, dielectric, ferromagnetic properties and high temperature magnetic phase transition of Sm1-xCaxFeO3 (x = 0–0.3) by the conventional solid-state reaction method were investigated. The crystalline structure, the microstructure, the dielectric property of the Sm1-xCaxFeO3 samples was characterized by x-ray diffraction (XRD) and field emissions canning electron microscopy (FESEM). The dielectric property measurement was performed by a precision impe...
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#1Z. Chu (Henan Normal University)H-Index: 2
#2Z.P. Ma (Henan Normal University)H-Index: 1
Last. F.G. Chang (Henan Normal University)H-Index: 4
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Abstract We report I-V characteristics and remarkable photovoltaic effect of (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O 10+δ /Ag (Bi-2223/Ag) heterostructure in the temperature range between 50 K and 340 K induced by purple-laser irradiation, which is closely related to the superconductivity of Bi-2223 and the charge transfer between silver electrode and the superconductor. Obvious photo-induced voltage has been observed in the whole temperature range with two polarity reversals at a critical temperature ( T p...
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#1G.L. Song (Henan Normal University)H-Index: 3
#2Y.C. Song (Henan Normal University)H-Index: 1
Last. F.G. Chang (Henan Normal University)H-Index: 4
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Abstract Multiferroic Bi 1-x Ho x FeO 3 (x = 0, 0.05, 0.1) ceramics have been prepared by rapid liquid phase sintering method. The effect of Ho 3+ doping on the crystal structure, dielectric, ferroelectric properties, T N and T M of BiFeO 3 ceramics is studied. The result shows that all the peaks for Bi 1-x Ho x FeO 3 samples can be indexed according to the crystal structure of pure BiFeO 3 by XRD and the grain size from 1 to 5 μm is observed for BiFeO 3 samples with Ho 3+ doped. The dielectric ...
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#1F. Yang (Henan Normal University)H-Index: 3
#2Han Mengyuan (Henan Normal University)H-Index: 3
Last. F.G. Chang (Henan Normal University)H-Index: 4
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The obvious photovoltaic effect (Voc ∼ 30 μV) induced by purple-laser illumination at high Tc superconductor YBa2Cu3O6.96/Ag (YBCO/Ag) heterojunction has been observed, revealing that there exists an electrical field across the YBCO/Ag interface. It has been found that magnetic field can dramatically change the photo-induced voltage in the vicinity of superconducting transition. With increasing magnetic fields up to 3 T, the photovoltage at 74 K and 30 mW/mm2 is reduced from 15 μV to zero and th...
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#1Feng Yang (Henan Normal University)H-Index: 5
#2Han Mengyuan (Henan Normal University)H-Index: 3
Last. F.G. Chang (Henan Normal University)H-Index: 4
view all 3 authors...
Photo-induced voltage in high temperature superconductors has been reported in the early 1990’s and extensively investigated ever since, yet its nature and mechanism remain unsettled1,2,3,4,5. YBa2Cu3O7-δ (YBCO) thin films6,7,8, in particular, are intensively studied in the form of photovoltaic (PV) cell due to its adjustable energy gap9,10,11,12,13. However, high resistance of the substrate always leads to a low conversion efficiency of the device and masks the primary PV properties of YBCO8. H...
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#1F. Yang (Henan Normal University)H-Index: 3
#2Han Mengyuan (Henan Normal University)H-Index: 3
Last. F.G. Chang (Henan Normal University)H-Index: 4
view all 3 authors...
I-V characteristics of YBCO-Ag system under blue laser (λ = 450 nm) illumination were studied from 100 to 300 K and obvious photovoltaic effects were observed. All the I-V curves in the temperature range intersect at a point in the first quadrant while the laser points to the cathode electrode, indicating a zero temperature coefficient of resistivity. This implies that the outputting voltage keeps constant in a broad temperature range when a critical bias current is assigned. The intersection po...
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#1Na ZhangH-Index: 2
#2J. SuH-Index: 1
Last. F.G. ChangH-Index: 4
view all 7 authors...
We investigate the room temperature microstructure and high temperature magnetic properties of Ca2+-substituted Bi1–xCaxFeO3 (0 ≤ x ≤ 0.2) ceramics. The Bi1–xCaxFeO3 compound transforms from rhombohedral into tetragonal structure with the phase boundary lying around x = 0.1. Based on this, the magnetic modulation becomes significant and the strongest remnant magnetization Mr is obtained at x = 0.1 compound. An important observation is the ferromagnetic-like phase transition revealed at TFM = 878...
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