Doping dependence of the spatially modulated dynamical spin correlations and the superconducting-transition temperature inLa2−xSrxCuO4

1998 ◽  
Vol 57 (10) ◽  
pp. 6165-6172 ◽  
Author(s):  
K. Yamada ◽  
C. H. Lee ◽  
K. Kurahashi ◽  
J. Wada ◽  
S. Wakimoto ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition ◽  
Spin Correlations ◽  
Doping Dependence ◽  
Dynamical Spin

scholarly journals INTERPLAY BETWEEN SINGLE PARTICLE COHERENCE AND KINETIC ENERGY DRIVEN SUPERCONDUCTIVITY IN DOPED CUPRATES

2004 ◽  
Vol 18 (17) ◽  
pp. 895-907 ◽  
Author(s):  
TIANXING MA ◽  
HUAIMING GUO ◽  
SHIPING FENG
Keyword(s):  
Transition Temperature ◽  
Kinetic Energy ◽  
Single Particle ◽  
Superconducting Transition Temperature ◽  
Spin Structure ◽  
Cuprate Superconductors ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Superconducting Transition ◽  
Dynamical Spin

Within the kinetic energy driven superconducting mechanism, the interplay between the single particle coherence and superconducting instability in doped cuprates is studied. The superconducting transition temperature increases with increasing doping in the underdoped regime, and reaches a maximum in the optimal doping, then decreases in the overdoped regime, however, the values of this superconducting transition temperature in the whole superconducting range are suppressed to low temperature due to the single particle coherence. Within this superconducting mechanism, we calculate the dynamical spin structure factor of cuprate superconductors, and reproduce all main features of inelastic neutron scattering experiments in the superconducting-state.

scholarly journals ANOMALOUS DOPING DEPENDENCE OF THE FLUCTUATION-INDUCED DIAMAGNETISM IN SUPERCONDUCTORS OF YBCO FAMILY

2003 ◽  
Vol 17 (04n06) ◽  
pp. 785-790 ◽  
Author(s):  
A. LASCIALFARI ◽  
A. RIGAMONTI ◽  
P. TEDESCO ◽  
L. ROMANO' ◽  
A. VARLAMOV ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Order Parameter ◽  
Theoretical Description ◽  
Recent Theory ◽  
Superconducting Transition ◽  
Layered Systems ◽  
Ginzburg Landau ◽  
Doping Dependence ◽  
Experimental Findings

SQUID magnetization measurements in oriented powders of Y1-xCaxBa2Cu3Oy from the underdoped to the overdoped regime are discussed in the light of an anomalous precursor fluctuating diamagnetism occurring above the bulk superconducting transition temperature. It is emphasized how both in the underdoped as well as in the overdoped YBCO compounds, the fluctuating magnetisation differs strongly from the predictions based on the Ginzburg-Landau anisotropic functional, at variance of what occurs in optimally doped YBCO. A theoretical description based on the extension of a recent theory for fluctuations of the order parameter in a layered systems of vortices, is briefly outlined. It is shown that such an approach, essentially assuming droplets with a local superconducting temperature above the bulk TC, accounts for most of the experimental findings, including irreversibility effects.

scholarly journals Asymmetric doping dependence of superconductivity between hole- and electron-doped triangular-lattice superconductors

2018 ◽  
Vol 32 (10) ◽  
pp. 1850122
Author(s):  
Yu Lan ◽  
Xixiao Ma ◽  
Ling Qin ◽  
Yongjun Wang ◽  
Shiping Feng
Keyword(s):  
Transition Temperature ◽  
Kinetic Energy ◽  
Triangular Lattice ◽  
Superconducting Transition Temperature ◽  
Narrow Range ◽  
Superconducting Transition ◽  
Optimal Doping ◽  
Doping Dependence ◽  
Wide Range ◽  
Doped Mott Insulator

Within the framework of kinetic-energy-driven superconductivity, the asymmetric doping dependence of superconductivity between the hole- and electron-doped triangular-lattice superconductors has been studied. It is shown that although the superconducting transition temperature has a dome-shaped doping dependence for both the hole- and electron-doped triangular-lattice superconductors, superconductivity appears over a wide range of doping in the hole-doped case, while it only exists in a narrow range of doping in the electron-doped case. Moreover, the maximum superconducting transition temperature around optimal doping in the electron-doped triangular-lattice superconductors is lower than that of the hole-doped counterparts. The theory also shows that the asymmetric doping dependence of superconductivity between the hole- and electron-doped cases may be a common feature for a doped Mott insulator.

scholarly journals Enhancing Superconductivity of the Nonmagnetic Quasiskutterudites by Atomic Disorder

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5830
Author(s):  
Andrzej Ślebarski ◽  
Maciej M. Maśka
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
High Temperature Superconductors ◽  
Superconducting Phase ◽  
Length Scale ◽  
Superconducting Transition ◽  
Atomic Disorder ◽  
Strong Inhomogeneity ◽  
Related Compounds

We investigated the effect of enhancement of superconducting transition temperature Tc by nonmagnetic atom disorder in the series of filled skutterudite-related compounds (La3M4Sn13, Ca3Rh4Sn13, Y5Rh6Sn18, Lu5Rh6Sn18; M= Co, Ru, Rh), where the atomic disorder is generated by various defects or doping. We have shown that the disorder on the coherence length scale ξ in these nonmagnetic quasiskutterudite superconductors additionally generates a non-homogeneous, high-temperature superconducting phase with Tc⋆>Tc (dilute disorder scenario), while the strong fluctuations of stoichiometry due to increasing doping can rapidly increase the superconducting transition temperature of the sample even to the value of Tc⋆∼2Tc (dense disorder leading to strong inhomogeneity). This phenomenon seems to be characteristic of high-temperature superconductors and superconducting heavy fermions, and recently have received renewed attention. We experimentally documented the stronger lattice stiffening of the inhomogeneous superconducting phase Tc⋆ in respect to the bulk Tc one and proposed a model that explains the Tc⋆>Tc behavior in the series of nonmagnetic skutterudite-related compounds.

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