scholarly journals Temperature dependence of the spectral weight in p- and n-type cuprates: A study of normal state partial gaps and electronic kinetic energy

2006 ◽  
Vol 321 (7) ◽  
pp. 1547-1558 ◽  
Author(s):  
N. Bontemps ◽  
R.P.S.M. Lobo ◽  
A.F. Santander-Syro ◽  
A. Zimmers
Keyword(s):  
Kinetic Energy ◽  
Temperature Dependence ◽  
Normal State ◽  
Spectral Weight

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.

ELECTRONIC TRANSFER OF LOCAL PAIRS AND SUPERCONDUCTIVITY IN METAL OXIDE COMPOUNDS

1988 ◽  
Vol 02 (05) ◽  
pp. 851-865 ◽  
Author(s):  
I. O. KULIK
Keyword(s):  
Kinetic Energy ◽  
Oxygen Atom ◽  
Metal Oxide ◽  
Conduction Band ◽  
Normal State ◽  
Tunneling Effect ◽  
Ir Absorption ◽  
Pair Condensation ◽  
Local Pair ◽  
Local Pairs

We propose that two-electron centers (local pairs) are formed at oxygen atom(s) which preexist superconductivity. Due to the interaction of these with the conduction band electrons (presumably those at Cu – O layers) the local pairs (which are supposed to be peroxide species, [Formula: see text], in perovskite high-Tc compounds) gain kinetic energy and become mobile. Superconductivity scenario is that of local pair condensation accompanied by BCS-like ordering of conduction band electrons. Consequences of the model concerning gap (or, rather, gaps) formation, pecularities of IR absorption and tunneling effect, and transport properties in the normal state are discussed.

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

scholarly journals The pseudogap in La2–xSrxCuO4: A Raman viewpoint

2000 ◽  
Vol 78 (5-6) ◽  
pp. 483-493 ◽  
Author(s):  
J G Naeini ◽  
J C Irwin ◽  
T Sasagawa ◽  
Y Togawa ◽  
K Kishio
Keyword(s):  
Fermi Surface ◽  
Normal State ◽  
Low Temperatures ◽  
Spectral Weight ◽  
Energy Scale ◽  
Low Energy ◽  
Scattering Rate ◽  
Low Energies ◽  
Consistent Picture ◽  
Rate Suppression

We report the results of Raman scattering experiments on single crystals of La2–xSrxCuO4 (La214) as a function of temperature and doping. In underdoped compounds low-energy B1g spectral weight is depleted in association with the opening of a pseudogap on regions of the Fermi surface located near (±π, 0) and (0, ±π).The magnitude of the depletion increases with decreasing doping, and in the most underdoped samples, with decreasing temperature.The spectral weight that is lost at low energies (ω [Formula: see text] 800 cm–1) is transferred to the higher energy region normally occupied by multimagnon scattering. From the normal-state B2g spectra we have determined the scattering rate Γ(ω,T) of qausiparticles located near the diagonal directions in k-space. In underdoped compounds, Γ(ω,T) is suppressed at low temperatures for energies less than Eg(x) [Formula: see text] 800 cm–1. The doping dependence of both the two-magnon scattering and the scattering rate suppression suggest that the pseudogap is characterized by an energy scale Eg ~ J, where J is the antiferromagnetic super-exchange energy. Comparison with the results from other techniques provides a consistent picture of the pseudogap in La214.PACS Nos.: 74.25.Gz, 74.72.Dn, 78.30.Er

Temperature induced normal state redistribution of B1g spectral weight in underdoped La2-xSrxCuO4

2000 ◽  
Vol 341-348 ◽  
pp. 907-908 ◽  
Author(s):  
J.G. Naeini ◽  
K.C. Hewitt ◽  
J.C. Irwin ◽  
T. Sasagawa ◽  
Y. Togawa ◽  
...  
Keyword(s):  
Normal State ◽  
Spectral Weight
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