scholarly journals Short-range impurity in the vicinity of a saddle point and the levitation of the two-dimensional delocalized states in a magnetic field

1996 ◽  
Vol 54 (3) ◽  
pp. 1928-1935 ◽  
Author(s):  
A. Gramada ◽  
M. E. Raikh
Keyword(s):  
Magnetic Field ◽  
Saddle Point ◽  
Short Range ◽  
Two Dimensional

Two-dimensional short-range scatterer in a magnetic field

1994 ◽  
Vol 49 (4) ◽  
pp. 2323-2326 ◽  
Author(s):  
S. A. Gredeskul ◽  
M. Ya. Azbel’
Keyword(s):  
Magnetic Field ◽  
Short Range ◽  
Two Dimensional

TEMPERATURE AND MAGNETIC FIELD DEPENDENCE OF CONDUCTION NOISE IN DOUBLE LAYERED La1.4Ca1.6Mn2O7 MANGANITE

2006 ◽  
Vol 06 (04) ◽  
pp. L387-L394 ◽  
Author(s):  
AJAI K. GUPTA ◽  
G. L. BHALLA ◽  
NEERAJ KHARE
Keyword(s):  
Magnetic Field ◽  
Short Range ◽  
Three Dimensional ◽  
Solid State Reaction Method ◽  
Insulator Transition ◽  
Spin Fluctuations ◽  
Excess Noise ◽  
Ferromagnetic Transition ◽  
Two Dimensional ◽  
Out Of Plane

Bulk samples of double layered manganite La 1.4 Ca 1.6 Mn 2 O 7 were prepared by solid-state reaction method. Study of magnetotransport properties revealed a metal to insulator transition at 160 K, a ferromagnetic transition at 164 K and appearance of two-dimensional short range ferromagnetic correlations around 235 K. The temperature dependence of conduction noise showed three peaks at 114 K, 165 K and 235 K which are attributed to excess noise generated due to setting up of three-dimensional out-of-plane ferromagnetic transition, two-dimensional out-of-plane ferromagnetic transition temperatures and appearance of two-dimensional short range ferromagnetic correlations respectively. In the temperature region ~ 160 K, excess noise was also generated due to the metal-insulator transition. In the paramagnetic region, conduction noise was found to remain unchanged with the applied magnetic field whereas in the ferromagnetic regions, the peaks at 114 K and 235 K got disappeared. The latter is attributed to the suppression of spin fluctuations.

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