Critical Doping in Overdoped High-Tc Superconductors: a Quantum Critical Point?

Tallon, J. L.; Loram, J. W.; Williams, G. V. M.; Cooper, J. R.; Fisher, I. R.; Johnson, J. D.; Staines, M.P.; Bernhard, C.

doi:10.1002/(sici)1521-3951(199909)215:1<531::aid-pssb531>3.0.co;2-w

Cited by 139 publications

(113 citation statements)

References 27 publications

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“…Moreover, in our results, the peak of the Hall number is found to be at p∼0.15, to the left of the optimal doping point (p=0.16). For a doping level of p∼0.15 the value expected for T * , the pseudogap crossover temperature, roughly matches 180 K [30]. Quantum oscillation experiments [18,[31][32][33] showed that while there is a large hole-like Fermi surface in the overdoped regime, there are only small pockets in the underdoped regime.…”

Section: Indications Of An Electronic Phase Transition In Two-mentioning

confidence: 67%

Indications of an Electronic Phase Transition in Two-Dimensional SuperconductingYBa2Cu3O7−xThin Films Induced by Electrostatic Doping

et al. 2012

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Section: Indications Of An Electronic Phase Transition In Two-mentioning

confidence: 67%

Indications of an Electronic Phase Transition in Two-Dimensional SuperconductingYBa2Cu3O7−xThin Films Induced by Electrostatic Doping

et al. 2012

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“…The parallels with several families of materials where the superconducting dome has been discovered in the vicinity of purely electronic ordered phase, dressing the quantum critical point [16][17][18] strengthen the viewpoint of excitonic superconductivity in 1T-TiSe 2 . On the other hand, the continuous development of the soft phonon mode in the vicinity of the CDW transition, both in Cu-intercalated and pure and pressurized material [8,34,35], suggests that the lattice deformation may not be regarded as a secondary effect that simply follows the electronic ordering.…”

Section: Fig 1 (Color Online)mentioning

confidence: 83%

“…The dependence of the superconducting transition temperature on the copper content shows a domelike structure, characteristically found in phase diagrams of cuprate high-temperature superconductors, some heavy fermion compounds and layered organics [15][16][17]. The superconductivity in those compounds is thought to be tightly related to neighboring antiferromagnetic ordering, with superconductivity appearing around a (purely electronic) quantum critical point (QCP) [16,18]. On the other hand the case of 1T-TiSe 2 signals the possibility of a novel state, where superconductivity emerges around a new type of quantum critical point, unrelated to magnetic degrees of freedom [4,8].…”

mentioning

confidence: 98%

Pressure Induced Superconductivity in Pristine1T−TiSe2

et al. 2009

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“…The normal state of the underdoped and optimally doped SC region also shows unusual non-Fermiliquid (FL) behaviors. There are increasing evidence for a Quantum Critical Point (QCP) around the optimal doping which is responsible for the unusual properties of the SC and the normal phase [7,8,9,10]. For the electrondoped (n-type) cuprates, on the other hand, antiferromagnetism survives until the superconductivity appears over a narrow range of x around the optimal x ∼ 0.15.…”

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confidence: 99%

Commensurate Spin Dynamics in the Superconducting State of an Electron-Doped Cuprate Superconductor

Kurahashi²,

et al. 2003

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We report neutron scattering studies on single crystals of the electron-doped (n-type) superconducting cuprate Nd2−x Cex CuO4 (x=0.15) with Tc = 18 K and 25 K. Unlike the hole-doped (p-type) superconducting cuprates where incommensurate magnetic fluctuations commonly exist, the n-type cuprate shows commensurate magnetic fluctuations at the tetragonal (1/2 1/2 0) reciprocal points both in the superconducting and in the normal state. A spin gap opens up when the n-type cuprate becomes superconducting, as in the optimally doped p-type La2−x Srx CuO4. The gap energy, however, increases gradually up to about 4 meV as T decreases from Tc to 2 K, which contrasts with the spin pseudogap behavior with a T-independent gap energy in the superconducting state of p-type cuprates. High-T c superconductivity emerges when charge carriers, holes or electrons, are doped into an antiferromagnetic Mott insulator [1,2,3]. Mechanism of the superconductivity lies on their common two-dimensional CuO 2 planes into which the charge carriers go. One of the issues in understanding the mechanism is question of the electron-hole symmetry. Electronic structure of the optimally doped cuprates shows evidence for the electron-hole symmetry. [4,5] Their phase diagrams over doping concentrations, however, are asymmetric.[6] For hole doping, antiferromagnetism rapidly weakens and is replaced by a spin-glass-like phase with characteristics of incommensurate spin correlations and pseudo-gap in transport measurements. The pseudo-gap temperature, T * , is well defined in the underdoped region and decreases with doping. The system becomes superconducting (SC) over a wide range of the hole concentration, x, around the optimal x = 0.15. The SC state has incommensurate spin correlations with a T-independent spin gap. The normal state of the underdoped and optimally doped SC region also shows unusual non-Fermiliquid (FL) behaviors. There are increasing evidence for a Quantum Critical Point (QCP) around the optimal doping which is responsible for the unusual properties of the SC and the normal phase [7,8,9,10]. For the electrondoped (n-type) cuprates, on the other hand, antiferromagnetism survives until the superconductivity appears over a narrow range of x around the optimal x ∼ 0.15. The normal state of the n-type cuprates shows FermiLiquid T 2 behavior in resistivity rather than the linear behavior of the hole-doped (p-type) cuprates. Therefore, investigating similarities and differences of the n-type and p-type cuprates would be crucial to understanding physics of the high-T c superconductivity. Compared to a large number of studies on the hole-doped cuprates using various techniques, however, only a small number of key experiments have been done on electron-doped cuprates [4,5,11,12] mainly because it is difficult to grow large single crystals and to prepare homogeneous superconducting samples by post-growth heat treatment.In this paper, we report neutron scattering measurements on single crystals of the electron-doped (n-type) superconducting cuprate N...

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Critical Doping in Overdoped High-Tc Superconductors: a Quantum Critical Point?

Cited by 139 publications

References 27 publications

Indications of an Electronic Phase Transition in Two-Dimensional SuperconductingYBa2Cu3O7−xThin Films Induced by Electrostatic Doping

Indications of an Electronic Phase Transition in Two-Dimensional SuperconductingYBa2Cu3O7−xThin Films Induced by Electrostatic Doping

Pressure Induced Superconductivity in Pristine1T−TiSe2

Commensurate Spin Dynamics in the Superconducting State of an Electron-Doped Cuprate Superconductor

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