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Vedeneev, S. I.; Jansen, A. G. M.; Haanappel, E.; Wyder, P.

doi:10.1103/physrevb.60.12467

Cited by 60 publications

(62 citation statements)

References 36 publications

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“…6(c) and (d), it can be concluded that the observed negative magnetoresistance corresponds to a suppression of the semiconducting-like behavior in ρ c (T ), which can in turn be interpreted as the magnetic-field induced suppression of the pseudogap. In previous measurements 33 we have shown that all ρ c (H) curves for Bi2201 single crystal with T c ≃ 7 K (overdoped) have a pronounced break-point in the derivative well above the ρ c (H) peak, which shifts to higher fields with decreasing temperature and at T ≃ T c disappears. The field position of these break-points in the derivative coincide with the H * c2 values determined from the ρ ab (H) curves.…”

Section: Pseudogapmentioning

confidence: 99%

“…In previous measurements 33 we have pointed out that in overdoped samples (T c = 7 K) the maxima of ρ c (H) coincide with the field positions of ρ ab (H) = 0.4ρ n ab where ρ n ab is the normal-state resistivity. The observed maximum in ρ c (H) is a property of the mixed state and results from a competition between the "semiconducting" behavior of ρ c and the superconducting transition.…”

Section: Pseudogapmentioning

confidence: 99%

“…Due to the lack of a sufficient amount of Bi2201 single crystals and especially crystals with different doping levels, the transport properties of this system have not previously been investigated in detail. Owing to the low critical temperature of Bi2201, 25 T magnetic fields are sufficient to suppress superconductivity in these samples in the T → 0 limit, even at optimal doping 33 . We have suppressed superconductivity in single crystals using a 28 T resistive magnet at the Grenoble High Magnetic Field Laboratory, in order to measure the in-plane R ab and the out-of-plane R c resistances in the normal state in magnetic fields applied perpendicular and parallel to the ab-plane.…”

Section: Introductionmentioning

confidence: 99%

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Metal-to-insulator crossover and pseudogap in single-layerBi2+xSr2−xCu1+<

Vedeneev

Maude

2004

Phys. Rev. B

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The in-plane ρ ab (H) and the out-of-plane ρc(H) magneto-transport in magnetic fields up to 28 T has been investigated in a series of high quality, single crystal, hole-doped La-free Bi2201 cuprates for a wide doping range and over a wide range of temperatures down to 40 mK. With decreasing hole concentration going from the overdoped (p=0.2) to the underdoped (p=0.12) regimes, a crossover from a metallic to and insulating behavior of ρ ab (T ) is observed in the low temperature normal state, resulting in a disorder induced metal insulator transition. In the zero temperature limit, the normal state ratio ρc(H)/ρ ab (H) of the heavily underdoped samples in pure Bi2201 shows an anisotropic 3D behavior, in striking contrast with that observed in La-doped Bi2201 and LSCO systems. Our data strongly support that that the negative out-of-plane magnetoresistance is largely governed by interlayer conduction of quasiparticles in the superconducting state, accompanied by a small contribution of normal state transport associated with the field dependent pseudogap. Both in the optimal and overdoped regimes, the semiconducting behavior of ρc(H) persists even for magnetic fields above the pseudogap closing field Hpg. The method suggested by Shibauchi et al. (Phys. Rev. Lett. 86, 5763, (2001)) for evaluating Hpg is unsuccessful for both under-and overdoped Bi2201 samples. Our findings suggest that the normal state pseudogap is not always a precursor of superconductivity.

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Section: Pseudogapmentioning

confidence: 99%

Section: Pseudogapmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metal-to-insulator crossover and pseudogap in single-layerBi2+xSr2−xCu1+<

Vedeneev

Maude

2004

Phys. Rev. B

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“…Cuprates within the homologous family have similar carrier concentrations, resistivities, anisotropies and layeredness, but largely different T c . For Bi-based cuprates the three-layer compound Bi 2 Sr 2 Ca 2 Cu 3 O 10+δ (Bi-2223) has a maximum T c of ∼ 110 K, the two-layer compound Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212) has a T c ∼ 95 K and a single-layer compound Bi 2 Sr 2 CuO 6+δ (Bi-2201) has an optimal (with respect to Oxygen doping) T c that ranges from ∼ 30 K for Bi/Pb and Sr/La substituted crystals [46] to just few K in the pure Bi-2201 compound [5,[47][48][49]. According to Ref.…”

Section: Introductionmentioning

confidence: 99%

“…The high T c leads to an extended region of thermally activated flux-flow. The complex physics of anisotropic pinning and melting of the vortex lattice [4] makes it hard, if at all possible [5], to confidently obtain H c2 from flux-flow characteristics at T < T c (H).…”

Section: Introductionmentioning

confidence: 99%

Low anisotropy of the upper critical field in a strongly anisotropic layered cuprateBi2.15Sr1.9CuO6+δ:Evidence for a paramagnetically limited superconductivity

et al. 2014

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We study angular-dependent magnetoresistance in a low Tc layered cuprate Bi2.15Sr1.9CuO 6+δ . The low Tc ∼ 4 K allows complete suppression of superconductivity by modest magnetic fields and facilitate accurate analysis of the upper critical field Hc2. We observe an universal exponential decay of fluctuation conductivity in a broad range of temperatures above Tc and propose a new method for extraction of Hc2(T ) from the scaling analysis of the fluctuation conductivity at T > Tc. Our main result is observation of a surprisingly low Hc2 anisotropy ∼ 2, which is much smaller than the effective mass anisotropy of the material ∼ 300. We show that the anisotropy is decreasing with increasing field and saturates at a small value when the field reaches the paramagnetic limit. We argue that the dramatic discrepancy of high field and low field anisotropies is a clear evidence for paramagnetically limited superconductivity.

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Superconducting Elements, Alloys, and Compounds

Buckel¹,

Kleiner

2004

Superconductivity

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Temperature dependence of the upper critical field ofBi2Sr2CuO

Cited by 60 publications

References 36 publications

Metal-to-insulator crossover and pseudogap in single-layerBi2+xSr2−xCu1+<

Metal-to-insulator crossover and pseudogap in single-layerBi2+xSr2−xCu1+<

Low anisotropy of the upper critical field in a strongly anisotropic layered cuprateBi2.15Sr1.9CuO6+δ:Evidence for a paramagnetically limited superconductivity

Superconducting Elements, Alloys, and Compounds

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