Temperature dependence of the strength of the interlayer coupling of anisotropic HTS in normal state

2000 ◽  
Vol 341-348 ◽  
pp. 181-182 ◽  
Author(s):  
G Sergeeva
Keyword(s):  
Temperature Dependence ◽  
Normal State ◽  
Interlayer Coupling

TEMPERATURE DEPENDENCE OF THE HALL EFFECT IN La2−xSrxCuO4 AND ABa2Cu3O7 (A=Y, Gd) HIGH TEMPERATURE SUPERCONDUCTORS

1987 ◽  
Vol 01 (03n04) ◽  
pp. 1067-1070 ◽  
Author(s):  
M. Petravić ◽  
A. Hamzić ◽  
B. Leontić ◽  
L. Forró
Keyword(s):  
High Temperature ◽  
Temperature Dependence ◽  
Hall Effect ◽  
Normal State ◽  
High Temperature Superconductors ◽  
The Other ◽  
Hall Constant ◽  
High Temperature Superconducting ◽  
Superconducting Ceramics ◽  
Hall Effect Measurements

We present Hall effect measurements in the normal state of the high temperature superconducting ceramics La2−xSrxCuO4 (x=0, 0.1, 0.15, 0.2, 0.25, 0.3), YBa2Cu3o7 and GdBa2Cu3O7 . The first family has temperature independent Hall constant for x>0, while in the other two systems RH is proportional to 1/T. From the Hall effect it follows that the transport in these compounds is hole-like.

Systematic variation for the temperature dependence of normal-state resistivity in (La1−xBax)2CuO4 system

1991 ◽  
Vol 185-189 ◽  
pp. 1239-1240 ◽  
Author(s):  
Shoichi Nagata ◽  
Mikio Nakajima ◽  
Kan-ichi Kido ◽  
Toshimi Ikeda ◽  
Susumu Chikazawa
Keyword(s):  
Temperature Dependence ◽  
Normal State ◽  
Systematic Variation ◽  
Normal State Resistivity

Temperature dependence of the normal state specific heat of κ-(BEDT-TTF)2Cu(NCS)2

1999 ◽  
Vol 103 (1-3) ◽  
pp. 2080 ◽  
Author(s):  
Nathanael A. Fortune ◽  
Guruswamy Rajaram ◽  
Keizo Murata
Keyword(s):  
Specific Heat ◽  
Temperature Dependence ◽  
Normal State

Anomalous temperature dependence of interlayer coupling in Fe/Si multilayers (abstract)

1996 ◽  
Vol 79 (8) ◽  
pp. 4775 ◽  
Author(s):  
R. P. Michel ◽  
A. Chaiken ◽  
M. A. Wall ◽  
J. W. Dykes ◽  
J. F. Ankner ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Interlayer Coupling ◽  
Anomalous Temperature Dependence ◽  
Anomalous Temperature

Out-of-Plane and in-Plane Conduction in Insulating and Strongly Underdoped Cuprates

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3203-3206
Author(s):  
C. C. Almasan ◽  
G. A. Levin ◽  
E. Cimpoiasu ◽  
T. Stein ◽  
D. A. Gajewski ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Normal State ◽  
Low Temperatures ◽  
Elementary Step ◽  
Charge Carriers ◽  
Two Dimensional ◽  
Out Of Plane ◽  
Underdoped Cuprates

We report measurements of out-of-plane (ρ c ) and in-plane (ρab) normal-state resistivities of single crystals of insulating PrBa2Cu3O 7-δ and strongly underdoped oxygen deficient YBa2Cu3O 6.41 using a flux transformer method. In the superconducting specimens, the onset of superconductivity was suppressed by a magnetic field of 9 T. We have found that the anisotropy ρc/ρab of these samples increases monotonically at low temperatures with no signs of saturation. The temperature dependence of ρc/ρab for YBa2Cu3O6.41 is well described by ρc/ρab=a +bT-2/3, but over a smaller temperature range than for insulating PrBa2Cu3O 7-δ. Both the absence of saturation of ρc/ρab and its T-2/3 dependence indicate two-dimensional conduction. This means that the average in-plane hopping distance of the localized charge carriers increases with decreasing T according to Mott's [Formula: see text] law, while the elementary step in the c-direction remains T independent, equal to the spacing between the bilayers.

PHONON ANOMALY IN RAMAN ACTIVE PHONONS OF CUPRATES IN NORMAL STATE

1999 ◽  
Vol 13 (03) ◽  
pp. 293-313 ◽  
Author(s):  
B. N. PANDA ◽  
G. C. ROUT
Keyword(s):  
Temperature Dependence ◽  
Normal State ◽  
Microscopic Theory ◽  
Temperature Limit ◽  
Model Parameters ◽  
Effective Electron ◽  
Electron Phonon Coupling ◽  
Raman Modes ◽  
Phonon Anomaly ◽  
Raman Active Phonon

We present here a microscopic theory to explain phonon anomaly in Raman active phonons of the cuprates R 2-x M x CuO 4 in normal state. We used electronic Hamiltonion of Fulde in presence of antiferromagnetism. We incorporated phonon interaction to the hybridisation between the conduction electrons of the system and the f-electrons. The spectral density is calculated by the Green fuction technique of Zubarev type at zero wave vector and low temperature limit. Temperature dependence of Raman active phonon frequencies are studied numerically to discern phonon anomalies by varying model parameters like position of f-level (∊f), the effective electron–phonon coupling strength (g), the staggered magnetic field (h) and the hybridisation parameter (V). The phonon anomalies are explained on the basis of softening, hardening and temperature dependence of different Raman modes.

Sign in / Sign up

Export Citation Format

Share Document