Superfluid density in cuprate high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductors: A new paradigm

Tallon, J. L.; Loram, J. W.; Cooper, J. R.; Panagopoulos, C.; Bernhard, C.

doi:10.1103/physrevb.68.180501

Cited by 157 publications

(166 citation statements)

References 27 publications

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“…With the common form of the electron Cooper pair, we also show that there is a coexistence of the electron Cooper pair and short-range AF correlation, and hence the short-range AF fluctuation can persist into the SC state. These results are qualitatively consistent with experiments 4,5,3 in the underdoped regime. In the present picture, each lattice site is singly occupied by a spin-up or -down electron at the half-filling, then the spins are coupled antiferromagnetically without AFLRO.…”

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confidence: 92%

Kinetic energy driven superconductivity in doped cuprates

2003

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Within the t-J model, the mechanism of superconductivity in doped cuprates is studied based on the partial charge-spin separation fermion-spin theory. It is shown that dressed holons interact occurring directly through the kinetic energy by exchanging dressed spinon excitations, leading to a net attractive force between dressed holons, then the electron Cooper pairs originating from the dressed holon pairing state are due to the charge-spin recombination, and their condensation reveals the superconducting ground state. The electron superconducting transition temperature is determined by the dressed holon pair transition temperature, and is proportional to the concentration of doped holes in the underdoped regime. With the common form of the electron Cooper pair, we also show that there is a coexistence of the electron Cooper pair and antiferromagnetic short-range correlation, and hence the antiferromagnetic short-range fluctuation can persist into the superconducting state. Our results are qualitatively consistent with experiments. 74.20.Mn, 74.62.Dh, 74.25.Dw Since the discovery of high-temperature superconductivity (HTSC) in doped cuprates, much effort has concentrated on the superconducting (SC) mechanism 1 . Much experimental evidence, including the factor of 2e occurring in the flux quantum and in the Josephson effect, as well as the electrodynamic and thermodynamic properties, supports the pairing theory 2 . The single common feature of cuprate superconductors is the presence of the two-dimensional (2D) CuO 2 plane 3 , then it is believed that the relatively high SC transition temperature T c is closely related to doped CuO 2 planes. The undoped state of cuprate superconductors is a Mott insulator with antiferromagnetic (AF) long-range order (AFLRO), then changing the carrier concentration by ionic substitution or increasing the oxygen content turns these compounds into the SC state leaving the AF short-range correlation still intact 3 . Moreover, the superfluid density in the underdoped regime vanishes more or less linearly with doping, and the SC transition temperature T c is proportional to a positive power of the concentration of doped holes δ (T c ∝ δ in doped CuO 2 ) 4,5 . Therefore there is a general consensus that the HTSC to holes interaction via a magnetic medium, and short-range AF correlation coexists with the SC state.In conventional superconductors, the electrons interact by exchanging phonons. Since this interaction leads to a net attractive force between electrons, the system can lower its potential energy by forming electron Cooper pairs 6 . These electron Cooper pairs condense into a coherent macroscopic quantum state and can move freely without resistance. As a result, pairing in the conventional superconductors is always related to an increase in kinetic energy which is overcompensated for by the lowering of the potential energy 6 . On the contrary, it has been argued that the SC transition in doped cuprates is determined by the need to reduce the frustrated kinetic energy 7 , where ...

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confidence: 92%

Kinetic energy driven superconductivity in doped cuprates

2003

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“…10 53 and YBCO 88 , which report either relaxation rate σ measured by muon spin rotation (µSR) technique, or the inverse square of the penetration depth λ extracted from the µSR data, field-dependent thermodynamic measurements, or electron spin resonance (ESR) studies. Both σ and λ −2 should be proportional to S φ .…”

Section: Superfluid Densitymentioning

confidence: 99%

Hypothesis of two-dimensional stripe arrangement and its implications for the superconductivity in high-Tccuprates

Fine

2004

Phys. Rev. B

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The hypothesis that holes doped into high-Tc cuprate superconductors organize themselves in two-dimensional (2D) array of diagonal stripes is discussed, and, on the basis of this hypothesis, a new microscopic model of superconductivity is proposed and solved. The model describes two kinds of hole states localized either inside the stripes or in the antiferromagnetic domains between the stripes. The characteristic energy difference between these two kinds of states is identified with the pseudogap. The onset of superconductivity is caused by the interaction, which is assumed to be mediated by the transverse fluctuations of stripes. The superconducting (SC) order parameter predicted by the model has two components, whose quantum phases exhibit a complex dependence on the the center-of-mass coordinate. The model predictions for the tunneling characteristics and for the dependence of the critical temperature (Tc) on the superfluid density show good quantitative agreement with a number of experiments. The model, in particular, predicts that the SC peaks in the tunneling spectra are asymmetric, only when ∆/Tc > 4, where ∆ is the SC gap. It is also proposed that, at least in some high-Tc cuprates, there exist two different superconducting states corresponding to the same doping concentration and the same critical temperature. Finally, the checkerboard pattern in the local density of states observed by scanning tunneling microscopy in Bi2Sr2CaCu2O 8+δ is interpreted as coming from the states localized around the centers of stripe elements forming the 2D superstructure.

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“…Surprisingly the same torque magnetometery [13,15,18] with the conventional logarithmic field dependence [18], one obtains surprisingly high upper critical fields H c2 > 120 Tesla and a very large Ginzburg-Landau parameter, κ = λ H /ξ > 450 even at temperatures close to T c . The in-plane low-temperature magnetic field penetration depth is λ H ≈ 220 nm in optimally doped Bi-2212 (see, for example [23]). Hence the zero temperature coherence length ξ turns out to be about the lattice constant, ξ 0.5nm.…”

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confidence: 99%

Normal-State Diamagnetism of Charged Bosons in Cuprate Superconductors

Alexandrov

2006

Phys. Rev. Lett.

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Normal state orbital diamagnetism of charged bosons quantitatively accounts for recent highresolution magnetometery results near and above the resistive critical temperature T c of superconducting cuprates. Our parameter-free descriptions of normal state diamagnetism, T c , upper critical fields and specific heat anomalies unambiguously support the 3D Bose-Einstein condensation of preformed real-space pairs with zero off-diagonal order parameter above T c at variance with phase fluctuation scenarios of cuprates.

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Superfluid density in cuprate high-Tcsuperconductors: A new paradigm

Cited by 157 publications

References 27 publications

Kinetic energy driven superconductivity in doped cuprates

Kinetic energy driven superconductivity in doped cuprates

Hypothesis of two-dimensional stripe arrangement and its implications for the superconductivity in high-Tccuprates

Normal-State Diamagnetism of Charged Bosons in Cuprate Superconductors

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