Effects of disorder on superconductivity of systems with coexisting itinerant electrons and local pairs

2010 ◽  
Vol 81 (6) ◽  
Author(s):  
G. Pawłowski ◽  
R. Micnas ◽  
S. Robaszkiewicz
Keyword(s):  
Itinerant Electrons ◽  
Effects Of Disorder ◽  
Local Pairs

SUPERCONDUCTIVITY OF SYSTEMS WITH COEXISTING ITINERANT ELECTRONS AND LOCAL PAIRS

2001 ◽  
Vol 15 (23) ◽  
pp. 3125-3142 ◽  
Author(s):  
WOJCIECH R. CZART ◽  
STANISŁAW ROBASZKIEWICZ
Keyword(s):  
Phase Diagrams ◽  
Linear Response ◽  
Linear Response Theory ◽  
Real Space ◽  
Electromagnetic Properties ◽  
Site Density ◽  
Itinerant Electrons ◽  
Interaction Term ◽  
Local Pair ◽  
Local Pairs

Phase diagrams and electromagnetic properties of the system of coexisting itinerant (c)-electrons and localized (d)-electrons which can form real space local pairs are analyzed. The model considered assumes arbitrary value of the on-site density interaction of d-electrons U d , which allows investigation of the effects of reduced d-pair binding energy. The phase diagrams of the system have been evaluated within the approach which treats the on-site interaction term U d exactly and the remaining interactions within the broke symmetry HFA. Within the linear response theory the electromagnetic kernels are calculated and basic superfluid characteristics of the system are determined as a function of electron concentration, interactions and relative position of the bands. Depending on parameters the model is found to exhibit several kinds of superconducting behaviors ranging from the BCS-like to the local pair-like. The relevance of obtained results to the interpretation of experimental data for short-coherence length superconductors is pointed out.

EFFECTS OF HOLE-DOPING AND DISORDER ON THE MAGNETIC STATES OF DELAFOSSITE CuCrO2 HAVING A SPIN-3/2 ANTIFERROMAGNETIC TRIANGULAR SUBLATTICE

2013 ◽  
Vol 27 (05) ◽  
pp. 1330002 ◽  
Author(s):  
TETSUJI OKUDA ◽  
RYOICHI KAJIMOTO ◽  
MARIO OKAWA ◽  
TOMOHIKO SAITOH
Keyword(s):  
Physical Properties ◽  
Hole Doping ◽  
Spin Liquid ◽  
Effects Of Disorder ◽  
Magnetic States

In this review, we will discuss the effects of itinerant hole and disorder produced by substitutions on the magnetic states of polycrystalline delafossite oxide CuCrO 2 having a spin-3/2 antiferromagnetic triangular sublattice. First, we will show the effects of hole-doping by the substitution of nonmagnetic Mg 2+ for magnetic Cr 3+ on the physical properties of CuCrO 2, and will discuss the origin of nontrivial promotion of the 120° Néel state due to the coupling between the itinerant hole and localized spin. Next, we will show the effects of disorder introduced by the isovalent substitutions such as the nonmagnetic Ag + substitution for nonmagnetic Cu + and the nonmagnetic Al 3+ one for magnetic Cr 3+, and will discuss the possibility of appearance of unusual magnetic states such as spin liquid or spin nematic states.

scholarly journals Effects of disorder on two strongly correlated coupled chains

1997 ◽  
Vol 56 (12) ◽  
pp. 7167-7188 ◽  
Author(s):  
E. Orignac ◽  
T. Giamarchi
Keyword(s):  
Strongly Correlated ◽  
Effects Of Disorder

Coexistence of Itinerant Electrons and Self-Trapped Electrons

1990 ◽  
Vol 59 (8) ◽  
pp. 2841-2847 ◽  
Author(s):  
Shugo Suzuki ◽  
Yutaka Toyozawa
Keyword(s):  
Trapped Electrons ◽  
Itinerant Electrons
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