Electron-Doped Superconductivity in CuO2 Layered Compounds with Nd2CuO4− structure

1989 ◽  
Vol 156 ◽  
Author(s):  
H. Takagi ◽  
T. Ito ◽  
H. Matsubara ◽  
H. Watabe ◽  
T. Ido ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Physical Properties ◽  
Transport Coefficients ◽  
Sharp Contrast ◽  
Layered Compounds ◽  
Hole Doping ◽  
High Tc ◽  
Electron Doping ◽  
High Tc Cuprates ◽  
Effect Of Doping

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.

SUPERCONDUCTIVITY AND TYPES OF GAP IN HIGH-Tc CUPRATES

2001 ◽  
Vol 15 (27) ◽  
pp. 3513-3528 ◽  
Author(s):  
FU-SUI LIU ◽  
WAN-FANG CHEN
Keyword(s):  
Phase Diagram ◽  
Long Range ◽  
Phase Coherence ◽  
Xy Model ◽  
Superconducting Gap ◽  
Band Model ◽  
High Tc ◽  
Local Spin ◽  
High Tc Cuprates

This paper extends the two-local-spin-mediated interaction from three- to four-band model, gives two T c formulas using long-range phase coherence condition in quantum and classical XY-models, phase diagram, and types of the gap in Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212). This paper argues that the superconducting gap and the pseudogap are the same gap just at different temperature regions. This paper also argues that the values of T c versus x should be determined by the long-range phase coherence conditions in the classical and quantum XY-model for underdoped and overdoped regions, respectively.

scholarly journals ON THE PHASE DIAGRAM OF HIGH TC CUPRATES

1992 ◽  
Vol 4 (2) ◽  
pp. 91-94,f2
Author(s):  
Hidetoshi FUKUYAMA
Keyword(s):  
Phase Diagram ◽  
High Tc ◽  
High Tc Cuprates

The Charge Ordering Behavior of Colossal Magnetoresistive (CMR) Layered Compounds La2-2xSr1+2xMn2O7 (x = 0.5 ∼ 0.6)

2001 ◽  
Vol 7 (S2) ◽  
pp. 410-411
Author(s):  
Z. P. Luo ◽  
D. J. Miller ◽  
J. F. Mitchell
Keyword(s):  
Physical Properties ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Charge Ordering ◽  
Layered Compounds ◽  
Hole Doping ◽  
Ion Milling ◽  
Colossal Magnetoresistive ◽  
Cold Stage

In colossal magnetoresistive (CMR) materials, large changes in physical properties stem from the interplay between charge ordering (CO) coupled with orbital and magnetic orderings. Thus detailed microstructural studies are important in understanding these changes in physical properties. In-situTEM observation is a very useful approach to study CO transitions in these CMR compounds. We have recently studied the CO behavior of the three-dimensional perovskite Nd1/2Sr1+2xMnO3. in this work, we report the CO of two-dimensional naturally layered compounds La2-2xSr1+2xMn2O7 (327 phase), where x is the hole doping level and varies from 0.5 to 0.6 in this work.Thin foil TEM specimens were prepared from polycrystalline bulk samples by conventional thinning and ion milling method at liquid N2 temperature. The in-situ TEM work was carried out in the Electron Microscopy Center at Argonne National Laboratory using a Philips CM30 with a liquid N2 cold stage, and a Hitachi H-9000 with liquid He cold stage.

Pairing Interaction in the Hole-Doped High-Tc Superconductors

1998 ◽  
Vol 12 (29n31) ◽  
pp. 2954-2957
Author(s):  
Sung-Ho Suck Salk
Keyword(s):  
Phase Diagram ◽  
Scattering Theory ◽  
Hole Doping ◽  
High Tc Superconductors ◽  
Pairing Interaction ◽  
High Tc ◽  
Positively Charged ◽  
Singlet Pair

A scenario for the possibility of hole-pairing is introduced on the basis of the phase diagram involving the spingap phase and the superconducting order for high-T c superconductors. Using our earlier generalized scattering theory, a theory of hole-pairing is proposed by allowing interaction between the negatively charged singlet pair and the positively charged holes as a result of hole doping.

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

2010 ◽  
Vol 79 (2) ◽  
pp. 023706 ◽  
Author(s):  
Yoichi Tanabe ◽  
Kensuke Suzuki ◽  
Tadashi Adachi ◽  
Yoji Koike ◽  
Takayuki Kawamata ◽  
...  
Keyword(s):  
Ground State ◽  
Hole Doping ◽  
High Tc ◽  
High Tc Cuprates

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

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.

scholarly journals Superconductivity in HEA-Type Compounds

2021 ◽  
Author(s):  
Yoshikazu Mizuguchi ◽  
Aichi Yamashita
Keyword(s):  
Layered Compounds ◽  
High Entropy Alloy ◽  
Synthesis Methods ◽  
Superconducting Properties ◽  
High Tc ◽  
High Entropy ◽  
Type Transition ◽  
Structural Dimensionality ◽  
Crystal Structural ◽  
High Tc Cuprates

Since the discovery of superconductivity in a high-entropy alloy (HEA) Ti-Zr-Nb-Hf-Ta in 2014, the community of superconductor science has explored new HEA superconductors to find the merit of the HEA states on superconducting properties. Since 2018, we have developed “HEA-type” compounds as superconductors or thermoelectric materials. As well known, compounds like intermetallic compounds or layered compounds are composed of multi crystallographic sites. In a HEA-type compounds, one or more sites are alloyed and total mixing entropy satisfies with the criterion of HEA. Herein, we summarize the synthesis methods, the crystal structural variation and superconducting properties of the HEA-type compounds, which include NaCl-type metal tellurides, CuAl2-type transition metal zirconides, high-Tc cuprates, and BiS2-based layered superconductors. The effects of the introduction of a HEA site in various kinds of complicated compounds are discussed from the structural-dimensionality viewpoint.

DEPENDENCE OF MAGNETIC SUSCEPTIBILITY ON THE NEXT NEAREST HOPPING TERM FOR HIGH TC CUPRATES

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3132-3137 ◽  
Author(s):  
JAE-GON EOM ◽  
JAE-HYEON EOM ◽  
SUNG-HO SUCK SALK
Keyword(s):  
Phase Diagram ◽  
Magnetic Susceptibility ◽  
Hole Concentration ◽  
Resonance Energy ◽  
Spin Susceptibility ◽  
Resonance Peak ◽  
High Tc ◽  
Doping Dependence ◽  
Spin Singlet ◽  
High Tc Cuprates

In view of increasing emphasis on the use of next-nearest hopping t' term in the t - J Hamiltonian, we examine its effect on the spin susceptibility and its correlation with the structure of phase diagram. We find from this study that the resonance peak of spin susceptibility rapidly decreases with hole concentration in the overdoped region at which the spin singlet pairing order diminishes. It is shown that the doping dependence of resonance energy in both underdoped and overdoped regions is in agreement with observations.

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