COMPARISON OF THE MAGNETIZATION BEHAVIORS IN PEROVSKITE COMPOUNDS La0.7-xLnxPb0.3MnO3 (Ln=Pr AND Sm)

2005 ◽  
Vol 19 (01n03) ◽  
pp. 563-568 ◽  
Author(s):  
S. L. YOUNG ◽  
H. Z. CHEN ◽  
LANCE HORNG ◽  
Y. W. HO ◽  
H.-C. I. KAO
Keyword(s):  
Cooling Curve ◽  
Zero Field ◽  
Considerable Decrease ◽  
Oxide Systems ◽  
Ionic Radii ◽  
Spin Order ◽  
Small Ionic Radius ◽  
Ferromagnetic Ordering ◽  
Zero Field Cooling ◽  
Field Cooling

The magnetization behaviors of two manganite oxide systems, La 0.7-x Ln x Pb 0.3 MnO 3 ( Ln = Pr and Sm ), have been synthesized. The replacement of La ions by Pr or Sm results in a considerable decrease in the ferromagnetic ordering temperature T C and clearly irreversible behavior in the zero-field-cooling-field-cooling curve at a low applied field, showing a short-range spin order phase. These facts are in agreement with the smaller ionic radii of Pr (0.130 nm) and Sm (0.124 nm) ions in contrast to La ion (0.136 nm), and the corresponding larger distortion of perovskite structures. The saturation magnetization M S decreases as Sm content increases relative to the increase of M S as Pr content increases. This can be interpreted in terms of the competition between suppression of ferromagnetism due to structure tuning induced by the small ionic radius of the interpolated cations into the La -site and the increase of ferromagnetically interacting spins due to the introduction of magnetic Pr or Sm ions with f-shell electrons.

scholarly journals Síntesis del superconductor YBa2Cu3O7- δ mediante sinterización por descarga luminiscente anormal

2017 ◽  
Vol 41 (158) ◽  
pp. 36
Author(s):  
Erika Yazmin Soto-Gómez ◽  
Armando Sarmiento-Santos ◽  
Carlos Arturo Parra-Vargas
Keyword(s):  
Zero Field ◽  
Zero Field Cooling ◽  
Field Cooling

En este trabajo se reporta la síntesis del superconductor YBa2Cu3O7-δ mediante el método no convencional de sinterización por plasma en el rango de descarga luminiscente anormal (DLA). Las muestras se sometieron a diferentes temperaturas y tiempos de sinterización. Como referencia se usó una muestra superconductora obtenida por el método convencional (horno resistivo). La caracterización estructural de estas muestras se hizo por difracción de rayos X y refinamiento con el método de Rietveld. El comportamiento superconductor se determinó mediante el análisis de las curvas de magnetización en función de la temperatura según los procedimientos experimentales de enfriado en campo magnético cero (zero field cooling, ZFC) y enfriado con campo magnético aplicado (field cooling, FC). Las muestras sinterizadas por DLA presentaron características estructurales (ortorrómbica Pmmm) y superconductoras con una temperatura crítica de Tc~ 92 K, similares a las obtenidas por el método convencional, pero con una significativa reducción en las temperaturas y tiempos, bajo un ambiente adecuado de presión en el proceso de sinterización. © 2017. Acad. Colomb. Cienc. Ex. Fis. Nat.

Induction technique for superconducting rings between field cooling and zero field cooling

2007 ◽  
Vol 459 (1-2) ◽  
pp. 24-26 ◽  
Author(s):  
H. González-Jorge ◽  
I. Quelle ◽  
L. Romaní ◽  
G. Domarco
Keyword(s):  
Zero Field ◽  
Induction Technique ◽  
Superconducting Rings ◽  
Zero Field Cooling ◽  
Field Cooling

Enhanced ferroelectricity and ferromagnetism in La1−xBixCrO3 by Bi3+ substitution

2007 ◽  
Vol 22 (8) ◽  
pp. 2081-2086 ◽  
Author(s):  
H-Y. Guo ◽  
J.I.L. Chen ◽  
Z-G. Ye ◽  
A.S. Arrott
Keyword(s):  
Solid Solution ◽  
Magnetic Properties ◽  
Quantum Interference ◽  
Remanent Polarization ◽  
Magnetic Hysteresis ◽  
Zero Field ◽  
Ferroelectric Hysteresis ◽  
Different Origins ◽  
Zero Field Cooling ◽  
Field Cooling

The ferroelectric and magnetic properties of the perovskite solid solution, (1 − x)LaCrO3–xBiCrO3, have been investigated. While pure LaCrO3 does not show ferroelectric hysteresis even at 77 K, the solid solution of La1−xBixCrO3 with x = 0.1, 0.2, 0.3, and 0.35 displays ferroelectric hysteresis, with the remanent polarization increasing with the increase of the Bi3+ content. Using a superconducting quantum interference device, the magnetization was measured versus temperature under field cooling (FC) and zero field cooling (ZFC) conditions. Magnetic hysteresis has been found in La1−xBixCrO3 (0.1 ⩽ x ⩽ 0.3) below the Néel temperature, TN. With the increase of Bi3+ content, TN decreases, while the magnetization below TN is enhanced. While the ferroelectric and magnetic properties could be due to different origins, the Bi substitution results in both ferroelectric and magnetic enhancements in the (1 − x)LaCrO3–xBiCrO3 solid solutions.

Calculation of the Interaction Forces between Superconductor and Permanent Magnet Using Equivalent Current Loops in Zero Field Cooling

2013 ◽  
Vol 634-638 ◽  
pp. 2436-2441
Author(s):  
Yong Yang ◽  
Xiao Jing Zheng ◽  
Tao Li ◽  
Zhi Qiang Hua
Keyword(s):  
Permanent Magnets ◽  
High Temperature Superconductors ◽  
Magnetic Bearing ◽  
Image Method ◽  
Zero Field ◽  
Vertical Force ◽  
Interaction Forces ◽  
Magnetic Dipoles ◽  
Zero Field Cooling ◽  
Field Cooling

The levitation between high temperature superconductors (HTSs) and permanent magnets (PMs) has been applied to the flywheel energy storage systems and magnetic bearing systems for the last nearly twenty years. The interaction forces acting on the levitating body are calculated by the modified frozen-image method. The magnetic dipoles are equivalent to Amperian current loops. The current intensity in loops changes linearly when the PM moves. Under the zero field cooling condition, the expression of vertical force is obtained when the PM traverses vertically, and when the PM traverses horizontally, the expressions of vertical and horizontal forces are obtained. Those expressions of vertical and horizontal forces are gained by calculating the forces between current loops and using superposition theorem of vector. The calculations agree well with the previous experimental data, which means that the deductions of the expressions are reliable.

Exchange bias induced after zero-field cooling in antiperovskite compounds Ga1-x NMn3+x

2014 ◽  
Vol 252 (3) ◽  
pp. 582-588 ◽  
Author(s):  
J. C. Lin ◽  
P. Tong ◽  
D. P. Cui ◽  
C. Yang ◽  
S. Lin ◽  
...  
Keyword(s):  
Exchange Bias ◽  
Zero Field ◽  
Zero Field Cooling ◽  
Field Cooling
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