Change of the Ground State upon Hole Doping Unveiled by Ni Impurity in High-Tc Cuprates

ABSTRACTWe have discovered 24 K-superconductivity in a family of compounds Ln2−xCexCuO4−y (Ln=Pr, Nd, Sm). Novel feature of the superconductivity in these family of compounds is that superconductivity is produced by electron-doping in sharp contrast with high-Tc cuprates discovered so far. The effect of doping on physical properties particularly the elecronic phase diagram and transport coefficients which indicate symmetry in many respects between electron- and hole- doping is described.

Download Full-text

Low-frequency spins and the ground state in high-Tc cuprates

Solid State Communications ◽

10.1016/s0038-1098(02)00667-1 ◽

2003 ◽

Vol 126 (1-2) ◽

pp. 47-55 ◽

Cited By ~ 23

Author(s):

C. Panagopoulos ◽

J.L. Tallon ◽

B.D. Rainford ◽

J.R. Cooper ◽

C.A Scott ◽

...

Keyword(s):

Ground State ◽

Low Frequency ◽

High Tc ◽

High Tc Cuprates

Download Full-text

EFFECT OF NON-MAGNETIC IMPURITIES (Zn, Li) ON THE STRIPED STATE OF A SPIN-FERMION MODEL FOR CUPRATES

International Journal of Modern Physics B ◽

10.1142/s0217979200003563 ◽

2000 ◽

Vol 14 (29n31) ◽

pp. 3610-3616

Author(s):

A. Moreo

Keyword(s):

Experimental Data ◽

Monte Carlo ◽

The Other ◽

Hole Doping ◽

Magnetic Impurities ◽

High Tc ◽

Fermion Model ◽

Monte Carlo Techniques ◽

High Tc Cuprates ◽

Good Agreement

The presence of stripes and the effect of adding non-magnetic impurities (NMI), such as Zn or Li, to high-Tc cuprates is studied applying Monte Carlo techniques to a spin-fermion model. It is observed that adding Li is qualitatively similar to diping with equa percentages of Sr and Zn. The mobile holes (MH) are trapped by the NMI and the system remains insulating and commensurate with antiferromagnetic (AF) correlations. This behavior persists in the region % NMI >% MH . On the other hand, when % NMI <% MH magnetic and charge incommensurabilities are observed. The vertical or horizontal holerich stripes, present when % NMI =0 upon hole doping, are pinned by the impurities and tend to become diagonal, surrounding finite AF domains. The % MH -% NMI plane is investigated. Good agreement with experimental results is found in the small portion of this diagram where experimental data are available. Predictions about the expected behavior in the remaining regions are made.

Download Full-text

Some ground state characteristics of the high-Tc cuprates within t-J-U model

10.1063/5.0002280 ◽

2020 ◽

Author(s):

Chumki Tarafdar ◽

Krishanu Roy ◽

Nanda Kumar Ghosh

Keyword(s):

Ground State ◽

High Tc ◽

High Tc Cuprates

Download Full-text

Doping Dependence of Bose Condensation Energy in High Tc Cuprates

International Journal of Modern Physics B ◽

10.1142/s0217979203020788 ◽

2003 ◽

Vol 17 (18n20) ◽

pp. 3231-3235

Author(s):

Sung-Sik Lee ◽

Sung-Ho Suck Salk

Keyword(s):

Degrees Of Freedom ◽

Doping Concentration ◽

Bose Condensation ◽

Hole Doping ◽

Condensation Energy ◽

Spin Gap ◽

High Tc ◽

Doping Dependence ◽

Boson Theory ◽

High Tc Cuprates

The doping dependence of the bose condensation energy is investigated by using our SU (2) holon-pair boson theory. It is shown that the bose condensation energy U results from the interplay between the charge and spin degrees of freedom and that the doping dependence of U at T=0K is well fit by the relation, [Formula: see text] with Δ0, the spin gap at 0K; x, the hole doping concentration and α, a constant.

Download Full-text

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

International Journal of Modern Physics B ◽

10.1142/s0217979299001478 ◽

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.

Download Full-text