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Yurgens, A.; Winkler, Dag; Claeson, T.; Ono, Shimpei; Ando, Yoichi

doi:10.1103/physrevlett.90.147005

Cited by 69 publications

(70 citation statements)

References 34 publications

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“…Their phase diagrams show that for samples with p=0.16 and under, the pseudogap closing temperature T * is over 300 K. These temperatures lie outside the range of our measurements. While for the overdoped sample with p=0.2, the value of T * =22 K found in our work agrees well with the pseudogap phase diagram of Yurgens et al 58 .…”

Section: Pseudogapsupporting

confidence: 93%

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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: Pseudogapsupporting

confidence: 93%

“…Yurgens et al 58 measured the intrinsic-tunneling spectra of a La-doped Bi2201 (T c =32 K) at T = 4.5 -300 K in order to determine the pseudogap phase diagram. Their phase diagrams show that for samples with p=0.16 and under, the pseudogap closing temperature T * is over 300 K. These temperatures lie outside the range of our measurements.…”

Section: Pseudogapmentioning

confidence: 99%

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

Vedeneev

Maude

2004

Phys. Rev. B

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“…It is seen that R c (T ) exhibits an upturn at T < T * ∼ 110 K, indicating opening of the c-axis PG. According to previous studies [30,46,50] such a T * corresponds to a near optimally doped (OP) (slightly underdoped) Bi-2201. A superconducting transition occurs at a much lower T c 4 K. The c-axis field of 14 T completely suppresses the superconducting transition but does not change significantly the PG characteristics due to a large disparity of superconducting and PG scales in this low-T c compound [30].…”

Section: Methodsmentioning

confidence: 94%

“…The c-axis transport is caused by interlayer tunneling. Below T c this leads to appearance of an intrinsic Josephson effect [54], observed in all Bi-based cuprates [6,8,16,53,55], including Bi-2201 [30,50,56]. Interlayer tunneling creates the basis for the intrinsic tunneling spectroscopy technique [6,8,16,30,53] and facilitates simultaneous magneto-transport and spectroscopic measurements, beneficial for analysis of H c2 [16].…”

Section: Methodsmentioning

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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“…The intrinsic tunneling spectroscopy in small crystals 52,53 and mesastructures 26,27,[54][55][56] In mesa structures the number of charge reservoir layers can be made small ͑10-20͒ and, correspondingly, the number of branches is easily countable. For example, in Ref.…”

Section: Intrinsic Tunneling Spectroscopy In Semicoherent Crystalsmentioning

confidence: 99%

Phenomenology of conduction in incoherent layered crystals

Levin¹

2004

Phys. Rev. B

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A novel phenomenological approach to the analysis of the conductivities of incoherent layered crystals is presented. It is based on the fundamental relationship between the resistive anisotropy σ ab /σc and the ratio of the phase coherence lengths in the respective directions. We explore the model-independent consequences of a general assumption that the out-of-plane phase coherence length of single electrons is a short fixed distance of the order of interlayer spacing. Several topics are discussed: application of the scaling theory, magnetoresistivity, the effects of substitutions and the intermediate regime of conduction when both coherence lengths change with temperature, but at different rate.

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Intrinsic Tunneling Spectra ofBi2(Sr2−x

Cited by 69 publications

References 34 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

Phenomenology of conduction in incoherent layered crystals

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