Transport Properties in YBa2Cu4O8/La0.67Ca0.33MnO3 Multilayers

2005 ◽  
Vol 475-479 ◽  
pp. 3761-3764
Author(s):  
K. Zhao ◽  
L. Zhang ◽  
B.L. Liang ◽  
C. Wu ◽  
J.F. Feng ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Transport Properties ◽  
Oscillatory Behavior ◽  
Spin Interaction ◽  
Ybco Layer ◽  
Magnetic Spin ◽  
Magnetoresistance Ratio

Transport properties of YBa2Cu4O8 (YBCO)/La0.67Ca0.33MnO3 (LCMO) multilayers were studied. The metal-semiconductor transition temperature shows an oscillatory behavior with a period ~ 12 nm. In contrast to that for LCMO films, the magnetoresistance ratio for multilayers is enhanced and strongly depends on the thickness of the YBCO layer. These results imply that the magnetic spin interaction between the LCMO layers may exist through the normal-conductive YBCO layer.

Photo- and exchange-field controlled line-type resonant peaks and enhanced spin and valley polarizations in a magnetic WSe2 junction

2022 ◽  
Author(s):  
Mohammad Alipour zadeh ◽  
Yaser Hajati ◽  
Imam Makhfudz
Keyword(s):  
Transport Properties ◽  
Resonant Tunneling ◽  
High Efficiency ◽  
Oscillatory Behavior ◽  
Spin Orbit Coupling ◽  
Exchange Field ◽  
Ideal Line ◽  
Transmission Resonances ◽  
Filtering Effect ◽  
Line Type

Abstract Existing resonant tunneling modes in the shape of line-type resonances can improve the transport properties of the junction. Motivated by the unique structural properties of monolayer WSe2 e.g. significant spin-orbit coupling (SOC) and large direct bandgap, the transport properties of a normal/ferromagnetic/normal (NFN) WSe2 junction with large incident angles in the presence of exchange field (h), off-resonance light (∆Ω) and gate voltage (U) is studied. In a certain interval of U, the transmission shows a gap with optically controllable width, while outside it, the spin and valley resolved transmissions have an oscillatory behavior with respect to U. By applying ∆Ω (h), an optically (electrically) switchable perfect spin and valley polarizations at all angles of incidence have been found. For large incident angles, the transmission resonances change to spin-valley-dependent separated ideal line-type resonant peaks with respect to U, resulting in switchable perfect spin and valley polarizations, simultaneously. Furthermore, even in the absence of U, applying h or ∆Ω at large incident angles can give some spin-valley dependent ideal transmission peaks, making h or ∆Ω a transmission valve capable of giving a switchable fully spinvalley filtering effect. These findings suggest some alternate methods for providing high-efficiency spin and valley filtering devices based on WSe2.

Oscillatory Behavior of the Transport Properties in Ni/Co Multilayers: A Superlattice Effect

1995 ◽  
Vol 74 (22) ◽  
pp. 4515-4518 ◽  
Author(s):  
J. M. Gallego ◽  
D. Lederman ◽  
S. Kim ◽  
Ivan K. Schuller
Keyword(s):  
Transport Properties ◽  
Oscillatory Behavior

Magnetic, Electronic - and Magneto - Transport Properties of Nanocrystalline Nd0.6Sr0.4MnO3 Manganites

2009 ◽  
Vol 67 ◽  
pp. 131-136 ◽  
Author(s):  
Kundu Sourav ◽  
Kumar Nath Tapan
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Transition Temperature ◽  
Curie Temperature ◽  
Transport Properties ◽  
Significant Variation ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Low Field

We have reported in this paper, the effect of grain size in Nd0.6Sr0.4MnO3 .We have investigated the effect of grain size on metal-insulator transition and Curie temperature. We have also reported here the variation of low field magnetoresistance with temperature and grain size. We have observed that the Curie temperature increases monotonically with particle size. The metal insulator transition temperature initially increases with particle size and then gets fixed to a certain value. In these Nd0.6Sr0.4MnO3 nanometric systems, any significant variation of magnetoresistance with particle size is not observed.

Effects of Disorder on the Transition Temperature and Transport Properties of a Low-TcA15Superconductor:Mo3Ge.

1979 ◽  
Vol 42 (1) ◽  
pp. 77-77
Author(s):  
M. Gurvitch ◽  
A. K. Ghosh ◽  
B. L. Gyorffy ◽  
H. Lutz ◽  
O. F. Kammerer ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Transport Properties ◽  
Effects Of Disorder

TRANSPORT PROPERTIES OF Ag-DOPED La0.7Ca0.3MnO3 THIN FILMS ON SILICON SUBSTRATE

2010 ◽  
Vol 24 (27) ◽  
pp. 5451-5456 ◽  
Author(s):  
H. C. JIANG ◽  
W. L. ZHANG ◽  
X. F. CAO ◽  
W. X. ZHANG ◽  
B. PENG
Keyword(s):  
Thin Films ◽  
Transition Temperature ◽  
Transport Properties ◽  
Silicon Substrate ◽  
Annealing Temperature ◽  
Rf Magnetron Sputtering ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Higher Temperature

Ag -doped La 0.7 Ca 0.3 MnO 3 (LCMO) films were prepared on silicon substrate by RF magnetron sputtering. The dependences of transport properties on annealing temperature were explored. It is shown that the resistivity of the samples decreases and the metal–insulator transition temperature shifts to higher temperature with the increase in annealing temperature. Two metal–insulator transition temperatures are presented in the R – T plots of Ag -doped LCMO films, which can be explained by the Ag 1+ substitution of La 3+ to form La 1-x Ag x MnO 3 compound. Compared with LCMO thin films, Ag -doping can observably improve the TM-I and decrease the resistivity of the samples.

Transport Properties of Coupled Semiconductor Quantum Dots

2006 ◽  
Vol 6 (11) ◽  
pp. 3329-3332 ◽  
Author(s):  
Heejun Jeong
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Transport Properties ◽  
Electronic Transport ◽  
Low Temperatures ◽  
Spin Interaction ◽  
Many Body ◽  
Conductance Measurement ◽  
Spin Configuration ◽  
Non Linear

We have measured the electronic transport properties of the coupled quantum dot devices at low temperatures. The interplay between the strong many body spin interaction and the molecular states are probed in linear and non-linear transport regime. We observe the formation of strong coherent molecular states clearly visible in the double dot conductance phase diagram. In our study, the spin configuration in multiply coupled quantum dots could be identified using Kondo phenomenon. In addition, the characteristics of the spin dependent molecular states and phase dependant tunneling have been also observed using non-linear conductance measurement of the double dots. The results suggest the importance of the diverse spin related physical issues in artificial quantum dot devices.

Synthesis and Gas Transport Properties of New High Glass Transition Temperature Ring-Opened Polynorbornenes

2002 ◽  
Vol 35 (12) ◽  
pp. 4677-4684 ◽  
Author(s):  
Armando Pineda Contreras ◽  
Mikhail A. Tlenkopatchev ◽  
Maria del Mar López-González ◽  
Evaristo Riande
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Transport Properties ◽  
Gas Transport ◽  
High Glass Transition Temperature ◽  
Gas Transport Properties
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