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Takenaka, K.; Mizuhashi, K.; Takagi, H.; Uchida, Satoshi

doi:10.1103/physrevb.50.6534

Cited by 269 publications

(178 citation statements)

References 22 publications

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“…Recent data [27] suggests that the critical doping level for the disappearance of the pseudogap in c-axis transport may be higher than p = 0.22 at least in Bi-2212. The pseudogap has less influence than the resonance mode on abplane properties as shown by work on the anisotropy of dc transport [28]. Also on theoretical grounds, a gap in the fluctuation spectrum will not give the upward step in the scattering rate that we observe [7].…”

mentioning

confidence: 79%

High-transition-temperature superconductivity in the absence of the magnetic-resonance mode

Hwang

Timusk

2004

Nature

221

293

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mentioning

confidence: 79%

High-transition-temperature superconductivity in the absence of the magnetic-resonance mode

Hwang

Timusk

2004

Nature

221

293

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“…Indeed, ρ c shows a typical upturn below a characteristic temperature T * ρ c . [10][11][12][13] This means that the DOS around the Fermi level is decreased by the opening of some kind of a gap below T * ρ c . The T * ρ c has been found to coincide well with T * χ , 13) below which magnetic susceptibility gradually decreases.…”

Section: Introductionmentioning

confidence: 99%

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

et al. 2014

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To investigate the relationship between the pseudogap and superconductivity, we measured both the in-plane (ρ ab ) and out-of-plane (ρ c ) resistivity for oxygen-controlled Bi 2 Sr 2 CaCu 2 O 8+δ single crystals subject to magnetic fields (parallel to the c axis) of up to 17.5 T. The onset temperature for the superconductive fluctuation, T sc f , is determined by the large positive in-plane magnetoresistance (MR) and negative out-of-plane MR observed near T c , whereas the pseudogap opening temperature T * is determined by the semiconductive upturn of the zero-field ρ c . T sc f was found to scale roughly as T c , with a decreasing temperature interval between them upon doping. On the other hand, T * starts out much higher than T sc f but decreases monotonically upon doping; finally, at a heavily overdoped state, it is not observed above T sc f . These results imply that the pseudogap is not a simple precursor of superconductivity, but that further study is needed to determine whether or not T * exists below T sc f in the heavily overdoped state.

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“…As the temperature dependence of the pairing peak is a key point, other possible contributions have to be discussed. We can exclude any contribution of the underdoped layer itself because the c-axis conductance of underdoped YBCO increases with temperature in this temperature range 20 , and because no specific energy dependence is expected. In this linear-response experiment, the current is directly proportional to Imχ, which is independent of the strength of the external field.…”

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confidence: 99%

Pairing fluctuations in the pseudogap state of copper-oxide superconductors probed by the Josephson effect

et al. 2008

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The phase diagram of high-temperature superconductors is still to be understood 1 . In the low-carrier-doping regime, a loss of spectral weight in the electronic excitation spectrum-the so-called pseudogap-is observed above the superconducting temperature T c , and below a characteristic temperature T * (ref. 2). First observed in the spin channel by NMR measurements, the pseudogap has also been observed in the charge channel by scanning probe microscopy and photoemission experiments, for instance 2 . An important issue to address is whether this phenomenon is related to superconductivity or to a competing 'hidden' order. In the superconductivity case, it has been suggested that superconducting pairing fluctuations may be responsible, but this view remains to be tested experimentally. Here, we have designed a Josephson-like experiment to probe directly the fluctuating pairs in the normal state. We show that fluctuations survive only in a restricted range of temperature above T c , well below T * , and therefore cannot explain the opening of the pseudogap at higher temperature.Angle-resolved photoemission spectroscopy 3,4 and scanning tunnelling spectroscopy 5 showed a characteristic energy of the pseudogap that merges with the superconducting gap when the temperature is lowered below T c . This reveals a smooth crossover rather than a sharp transition line between the pseudogap regime and the superconducting state, and has led to the superconducting precursor scenario. As opposed to the conventional Bardeen-Cooper-Schrieffer (BCS) transition, where pairing and condensation occur simultaneously at T c , in underdoped cuprates fluctuating pairs may form at T * , with no long-range coherence, and condense in the superconducting state at T c (refs 6,7). Difficulties in confirming (or invalidating) this scenario arise from the fact that most of the experimental techniques used to investigate the pseudogap are sensitive only to the one-particle excitations, and therefore cannot provide a test of pairing above T c . Owing to its ability to probe the properties of the superconducting wavefunction, the Josephson effect is a natural way to address the fluctuation issue.In a second-order phase transition, the susceptibility is given by the linear response of the order parameter to a suitable external field. In the case of the superconducting phase transition, the role of the external field can be played by the rigid pair field of a second superconductor below its own T c (refs 8,9). In a Josephson junction in which one side of the junction is the fluctuating superconductor of interest above its T c , whereas the other side is a superconductor below its T c , the coupling between the pairing fluctuations and the well-established pair field gives rise to an excess current I ex proportional to the imaginary part of the frequency-and wavenumber-dependent pair susceptibility χ(ω, q). For a conventional superconductor above its T c (ref. 9)where Γ 0 = (16k B /h)(T − T c ) is the relaxation rate of the fluctuations, ξ(T ) is the ...

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Interplane charge transport inYBa2Cu3
K. Takenaka
¹
,
K. Mizuhashi
²
,
H. Takagi
³

et al.

Cited by 269 publications

References 22 publications

High-transition-temperature superconductivity in the absence of the magnetic-resonance mode

High-transition-temperature superconductivity in the absence of the magnetic-resonance mode

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Pairing fluctuations in the pseudogap state of copper-oxide superconductors probed by the Josephson effect

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Interplane charge transport inYBa2Cu3K. Takenaka1, K. Mizuhashi2, H. Takagi3 et al.

Cited by 269 publications

References 22 publications

High-transition-temperature superconductivity in the absence of the magnetic-resonance mode

High-transition-temperature superconductivity in the absence of the magnetic-resonance mode

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi2Sr2CaCu2O8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Pairing fluctuations in the pseudogap state of copper-oxide superconductors probed by the Josephson effect

Contact Info

Product

Resources

About

Interplane charge transport inYBa2Cu3
K. Takenaka
¹
,
K. Mizuhashi
²
,
H. Takagi
³

et al.

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements