DISTINCTIVE FEATURES OF NOVEL SUPERCONDUCTING TRANSITIONS IN UNDERDOPED AND OVERDOPED HIGH-Tc CUPRATES

2005 ◽  
Vol 19 (01n03) ◽  
pp. 43-45
Author(s):  
S. DZHUMANOV ◽  
J. D. FAN
Keyword(s):  
Phase Transitions ◽  
Liquid State ◽  
Cooper Pair ◽  
Pair Formation ◽  
High Tc ◽  
Distinctive Features ◽  
Bose Liquid ◽  
Pair Condensation ◽  
High Tc Cuprates ◽  
Superconducting Transitions

It is argued that the new theory that combines the precursor BCS-like non-superconducting (SC) pairing and the Cooper-pair condensation into a superfluid Bose-liquid state is more plausible than the standard SC fluctuation approach in describing the distinctive features of the underdoped and overdoped high-Tc cuprates. We show that the scenarios for high-Tc superconductivity in these materials are quite different on the character of the Cooper-pair formation and SC phase transitions.

scholarly journals Unusual metallic conductivity of high-Tc cuprates

2021 ◽  
Vol 5 (3) ◽  
pp. 183-191
Author(s):  
S. Dzhumanov ◽  
Sh.R. Malikov ◽  
Sh.S. Djumanov
Keyword(s):  
Transport Theory ◽  
Charge Carriers ◽  
Cooper Pairs ◽  
Linear Temperature Dependence ◽  
Linear Temperature ◽  
High Tc ◽  
Distinctive Features ◽  
Metallic Conductivity ◽  
Temperature Dependences ◽  
High Tc Cuprates

The intrinsic mechanisms of the unusual metallic transports of three types of relevant charge carriers (large polarons, excited (dissociated) polaronic components of bosonic Cooper pairs and bosonic Cooper pairs themselves) along the CuO2 layers of high-Tc cuprates are identified and the new features of metallic conductivity in the CuO2 layers (i.e. ab -planes) of underdoped and optimally doped cuprates are explained. The in-plane conductivity of high-Tc cuprates is associated with the metallic transports of such charge carriers at their scattering by lattice vibrations in thin CuO2 layers. The proposed charge transport theory in high-Tc cuprates allows to explain consistently the distinctive features of metallic conductivity and the puzzling experimental data on the temperature dependences of their in-plane resistivity pab. In underdoped and optimally doped cuprates the linear temperature dependence of pab(T) above the pseudogap formation temperature T∗ is associated with the scattering of polaronic carriers at acoustic and optical phonons, while the different (upward and downward) deviations from the linearity in pab(T) below T∗ are caused by the pseudogap effect on the conductivity of the excited Fermi components of bosonic Cooper pairs and by the dominating conductivity of bosonic Cooper pairs themselves in the normal state of these high-Tc materials.

HOLON-PAIR CONDENSATION OF HIGH Tc CUPRATES: SUPERSYMMETRY CONDITIONS

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3455-3459 ◽  
Author(s):  
SUNG-SIK LEE ◽  
SUNG-HO SUCK SALK
Keyword(s):  
Free Energy ◽  
Symmetry Breaking ◽  
Bose Condensation ◽  
High Tc ◽  
Pair Condensation ◽  
High Tc Cuprates

Based on the t–J Hamiltonian of U(1) slave-boson symmetry it is shown from our derived free energy that symmetry breaking can occur to allow holon-pair bose condensation. Supersymmetry conditions are proposed based on our derived quasiparticle Hamiltonian involving both spinons and holons.

Mechanism of Pseudogap in High-Tc Cuprates

1998 ◽  
Vol 12 (29n31) ◽  
pp. 2935-2938
Author(s):  
Fu-Sui Liu
Keyword(s):  
Long Range ◽  
Cooper Pair ◽  
Phase Coherence ◽  
High Tc ◽  
Quasiparticle Excitation ◽  
High Tc Cuprates

This paper shows that the pseudogap (PG) of Y123 and B2212 is caused by two-local- Cu ++-spin-mediated interaction (TLSMI) in the CuO 2 plane and that PG is a gap of quasiparticle excitation which breaks a Cooper pair without long-range phase coherence.

A PAIR POTENTIAL FOR THE COOPER PAIR IN THE HIGH-Tc CUPRATES

1999 ◽  
Vol 13 (11) ◽  
pp. 1447-1453
Author(s):  
FU-SUI LIU ◽  
WAN-FANG CHEN ◽  
T.-P. CHEN ◽  
J. T. WANG
Keyword(s):  
High Pressure ◽  
Long Range ◽  
Empirical Formula ◽  
Cooper Pair ◽  
Pair Potential ◽  
Hole Doping ◽  
High Tc ◽  
Superconductive State ◽  
Set Up ◽  
High Tc Cuprates

Taking the two-local-spin-mediated interaction (TLSMI) as the pair potential for the Cooper pair and considering the long-range phase coherence (LRPC), the empirical formula of T c versus hole doping is explained and the physical picture for the pseudogap and the gap in superconductive state is set up. The superconductivity in PrBa 2 Cu 3 O 7-δ and CuCl at high pressure and Fe 1-x S is discussed.

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