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Ito, T.; Takenaka, K.; Uchida, Satoshi

doi:10.1103/physrevlett.70.3995

Cited by 609 publications

(363 citation statements)

References 21 publications

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“…It is well known that the resistivity of cuprates around optimal doping increases linearly with increasing temperature over a wide range (often described as T-linear r) 28 . We found that the resistance of Bi2212 in the normal state increased linearly with increasing temperature not only at 270-unit-cell thickness (which can be considered a bulk material, because its R-T curve is the same as that of the bulk 29 ), but even down to half-unit-cell thickness (Fig.…”

Section: Resultsmentioning

confidence: 99%

High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene

Jiang

You

et al. 2014

Nat Commun

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High-T c superconductors confined to two dimension exhibit novel physical phenomena, such as superconductor-insulator transition. In the Bi 2 Sr 2 CaCu 2 O 8 þ x (Bi2212) model system, despite extensive studies, the intrinsic superconducting properties at the thinness limit have been difficult to determine. Here, we report a method to fabricate high quality single-crystal Bi2212 films down to half-unit-cell thickness in the form of graphene/Bi2212 van der Waals heterostructure, in which sharp superconducting transitions are observed. The heterostructure also exhibits a nonlinear current-voltage characteristic due to the Dirac nature of the graphene band structure. More interestingly, although the critical temperature remains essentially the same with reduced thickness of Bi2212, the slope of the normal state T-linear resistivity varies by a factor of 4-5, and the sheet resistance increases by three orders of magnitude, indicating a surprising decoupling of the normal state resistance and superconductivity. The developed technique is versatile, applicable to investigate other two-dimensional (2D) superconducting materials.

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Section: Resultsmentioning

confidence: 99%

High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene

Jiang

You

et al. 2014

Nat Commun

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“…One way to define T* is through the resistivity [5], as the temperature below which ρ(T) deviates from its linear dependence at high temperature. A resistively-defined T*, which we label T ρ *, was first reported for YBCO [37], where the deviation is downwards. In LSCO, however, the deviation is upwards [38], as indeed in Nd-LSCO [27,33,39].…”

Section: The Pseudogap Phasementioning

confidence: 99%

Fermi surface reconstruction in high-T_csuperconductors

Taillefer

2009

J. Phys.: Condens. Matter

143

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Abstract. The recent observation of quantum oscillations in underdoped high-T c superconductors, combined with their negative Hall coefficient at low temperature, reveals that the Fermi surface of hole-doped cuprates includes a small electron pocket. This strongly suggests that the large hole Fermi surface characteristic of the overdoped regime undergoes a reconstruction caused by the onset of some order which breaks translational symmetry. Here we consider the possibility that this order is "stripe" order, a form of combined charge / spin modulation observed most clearly in materials like Eu-doped and Nd-doped LSCO. In these materials, the onset of stripe order coincides with major changes in transport properties, providing strong evidence that stripe order is indeed the cause of Fermi-surface reconstruction. We identify the critical doping where this reconstruction occurs and show that the temperature dependence of transport coefficients at that doping is typical of metals at a quantum critical point. We discuss how the pseudogap phase may be a fluctuating precursor of the stripeordered phase. Phase diagramThe doping phase diagram of hole-doped cuprates is sketched in Fig. 1a. With increased doping p, the materials go from being antiferromagnetic insulators at zero doping to more or less conventional metals at high doping. The overdoped metallic state is characterized by a single large hole Fermi surface whose volume contains 1 + p holes per Cu atom, as determined by angle-dependent magnetoresistance (ADMR) [1] and angle-resolved photoemission spectroscopy (ARPES) [2]. The lowtemperature Hall coefficient R H is positive and equal to V / e (1 + p) [3], as expected for a single-band metal with a hole density n = 1 + p. The electrical resistivity ρ(T) exhibits the standard T 2 temperature dependence of a Fermi liquid [4].At intermediate doping, between the insulator and the metal, there is a central region of superconductivity, delineated by a critical temperature T c which can rise to values of order 100 K. Above the maximal T c , near optimal doping, the normal state is a "strange metal", characterized by a resistivity which is linear in temperature instead of quadratic. In the midst of this strange-metal region, the enigmatic "pseudogap phase" sets in, below a crossover temperature T* where most physical properties undergo a smooth yet significant change [5].Elucidating the nature of the pseudogap phase is key to understanding high-temperature superconductivity. Two main scenarios have been proposed [6]: fluctuating superconductivity -a precursor to the long-range coherence which sets in below T c -versus some other ordered state. For hole-doped cuprates, a number of different types of order have been proposed, including "stripe order"

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“…For example, the resistivity drop is a common feature of underdoped cuprates, in which the drop is considered to be the signature of the pseudogap. 6) To the best of our knowledge, the highest record of the zero resistivity temperature is, at most, 140 K even today. [2][3][4] In order to definitively prove the occurrence of superconductivity and to accurately determine T c from the resistivity measurements, one must to demonstrate that (1) the resistivity drop is sharp enough and that (2) zero resistivity is realized below the transition.…”

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confidence: 99%

Zero Resistivity above 150 K in HgBa₂Ca₂Cu₃O_8+δat High Pressure

et al. 2013

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We measured the electrical resistivity of a HgBa 2 Ca 2 Cu 3 O 8þ (Hg-1223) polycrystalline sample under high pressure. Owing to the improved sample quality and the nearly hydrostatic pressure, we successfully observed zero resistivity, which is the unambiguous signature of superconductivity, up to the unprecedented temperature of 153.0 K at 15 GPa. This temperature surpasses the previous records by more than 10 K. Referring to the experimental results, we established the exact pressure (P) vs superconducting transition temperature (T c ) relationship. T c increases with P up to 15 GPa, suggesting the possibility of further enhancement of T c at higher pressures.

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Systematic deviation fromT-linear behavior in the in-plane resistivity ofYBa2Cu3

Cited by 609 publications

References 21 publications

High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene

High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene

Fermi surface reconstruction in high-T_csuperconductors

Zero Resistivity above 150 K in HgBa₂Ca₂Cu₃O_8+δat High Pressure

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Systematic deviation fromT-linear behavior in the in-plane resistivity ofYBa2Cu3

Cited by 609 publications

References 21 publications

High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene

High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene

Fermi surface reconstruction in high-Tcsuperconductors

Zero Resistivity above 150 K in HgBa2Ca2Cu3O8+δat High Pressure

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Product

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Fermi surface reconstruction in high-T_csuperconductors

Zero Resistivity above 150 K in HgBa₂Ca₂Cu₃O_8+δat High Pressure