Reentrant metal-insulator transition in the Cu-doped manganitesLa1−xPbxMnO3(x∼0.14)single crystals

2005 ◽  
Vol 72 (13) ◽  
Author(s):  
B. C. Zhao ◽  
W. H. Song ◽  
Y. Q. Ma ◽  
R. Ang ◽  
S. B. Zhang ◽  
...  
Keyword(s):  
Single Crystals ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator

Effect of uniaxial pressure on metal-insulator transition in (Sm1−yNdy)0.52Sr0.48MnO3 single crystals

2009 ◽  
Vol 94 (25) ◽  
pp. 252506 ◽  
Author(s):  
A. Murugeswari ◽  
P. Sarkar ◽  
S. Arumugam ◽  
N. Manivannan ◽  
P. Mandal ◽  
...  
Keyword(s):  
Single Crystals ◽  
Insulator Transition ◽  
Uniaxial Pressure ◽  
Metal Insulator Transition ◽  
Metal Insulator

METAL–INSULATOR TRANSITION AND THE TEMPERATURE OF THE PSEUDOGAP ANOMALY OPENING IN PRASEODYMIUM DOPED Y1-zPrzBa2Cu3O7-δ SINGLE CRYSTALS

2013 ◽  
Vol 27 (04) ◽  
pp. 1350029 ◽  
Author(s):  
R. V. VOVK ◽  
Z. F. NAZYROV ◽  
I. L. GOULATIS ◽  
A. CHRONEOS ◽  
V. M. PINTO SIMOES
Keyword(s):  
Electrical Resistivity ◽  
Single Crystals ◽  
Insulator Transition ◽  
Critical Regime ◽  
Significant Shift ◽  
Asymptotic Dependence ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
The One ◽  
Praseodymium Doping

The influence of praseodymium doping on the electrical resistivity in the ab-plane of Y 1-z Pr z Ba 2 Cu 3 O 7-δ single crystals, is investigated. It is determined that as the concentration of praseodymium (0.0 ≤ z ≤ 0.5) is rising there occurs a significant shift of the temperature regions, corresponding to the metal–insulator transitions, as well as to the regime of the implementation of the pseudogap anomaly. The part of the curves related to the metal–insulator transition are well described by means of an asymptotic dependence that corresponds to the implementation of a quantum critical regime in the system, the so-called law of the "one third".

Giant 1/f Noise in Low-Tc CMR Manganites: Evidence of the Percolation Threshold

1999 ◽  
Vol 602 ◽  
Author(s):  
V. Podzorov ◽  
M. Uehara ◽  
M. E. Gershenson ◽  
T. Y. Koo ◽  
S-W. Cheong
Keyword(s):  
Phase Separation ◽  
Single Crystal ◽  
Percolation Threshold ◽  
Single Crystals ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Percolation Network

AbstractWe observed a dramatic peak in the 1/f noise at the metal-insulator transition (MIT) in low-Tc, manganites. This many-orders-of-magnitude noise enhancement is observed for both polycrystalline and single-crystal samples of La5/8−y. Pry, Ca3/8MnO3 (y = 0.35 – 0.4) and Pr1−xCaxMnO3 (x = 0.35 – 0.5). This observation strongly suggests that the microscopic phase separation in the low-Tc, manganites causes formation of a percolation network, and that the observed MIT is a percolation threshold. It is shown that the scale of phase separation in polycrystalline samples is much smaller than that in single crystals.

scholarly journals Flicker noise in degenerately doped Si single crystals near the metal-insulator transition

Pramana ◽  
2002 ◽  
Vol 58 (2) ◽  
pp. 343-359 ◽  
Author(s):  
A K Raychaudhuri ◽  
Arindam Ghosh ◽  
Swastik Kar
Keyword(s):  
Single Crystals ◽  
Flicker Noise ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator

COEXISTENCE OF DIFFERENT TYPES OF TRANSVERSE CONDUCTIVITY IN Y1-xPrxBa2Cu3 O7-δ SINGLE CRYSTALS WITH DIFFERENT PRASEODYMIUM CONCENTRATIONS

2013 ◽  
Vol 27 (27) ◽  
pp. 1350198 ◽  
Author(s):  
R. V. VOVK ◽  
N. R. VOVK ◽  
I. L. GOULATIS ◽  
A. CHRONEOS
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Single Crystals ◽  
Insulator Transition ◽  
Superconducting Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Different Types ◽  
Transverse Conductivity ◽  
Praseodymium Doping

In this paper, the influence of praseodymium doping on the conductivity across (transverse) the basal plane of high-temperature superconducting Y 1-x Pr x Ba 2 Cu 3 O 7-δ single crystals is investigated. It is determined that an increase of praseodymium doping leads to increased localization effects and the implementation of a metal–insulator transition Y 1-x Pr x Ba 2 Cu 3 O 7-δ, which always precedes the superconducting transition. The increase of the praseodymium concentration also leads to a significant displacement of the point of the metal–insulator transition to the low temperature region.

scholarly journals Metal-insulator transition in antiferromagnetic Ba1−xKxMn2As2(0≤x≤0.4) single crystals studied by55Mn and75As NMR

2013 ◽  
Vol 88 (24) ◽  
Author(s):  
S. Yeninas ◽  
Abhishek Pandey ◽  
V. Ogloblichev ◽  
K. Mikhalev ◽  
D. C. Johnston ◽  
...  
Keyword(s):  
Single Crystals ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator
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