Electronic Phase Diagram of High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math>Cuprate Superconductors from a Mapping of the In-Plane Resistivity Curvature

Ando, Yoichi; Komiya, Seiki; Segawa, Kouji; Ono, Shimpei; Kurita, Y.

doi:10.1103/physrevlett.93.267001

Cited by 366 publications

(462 citation statements)

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“…The ubiquity of phase-fluctuating superconductivity and the coincidence between T 2 , as determined by dρ ab /dT , and the vanishing of H 2 (T ), as determined by the high-field magnetoresistance, imply that one might now be able to identify the phase fluctuation regime in any cuprate system (at or beyond optimal doping) simply by taking the first (or second) derivative of the zero-field resistivity curve. Indeed, excellent agreement is already noted between the fluctuation onset temperatures determined by the Nernst effect and magnetization in LSCO, Bi 2 Sr 2−y La y CuO 6 and optimally doped YBa 2 Cu 3 O 7 and the corresponding T 2 values obtained from d 2 ρ ab /dT 2 analysis of Ando and co-workers 30 . Such agreement suggests that it should be relatively straightforward to generalize these findings to other new or existing cuprate families.…”

supporting

confidence: 56%

Phase-fluctuating superconductivity in overdoped La2−xSrxCuO4

Rourke

Mouzopoulou

et al. 2011

Nature Phys

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In underdoped cuprate superconductors, phase stiffness is low and long-range superconducting order is destroyed readily by thermally generated vortices (and anti-vortices), giving rise to a broad temperature regime above the zero-resistive state in which the superconducting phase is incoherent 1-4 . It has often been suggested that these vortex-like excitations are related to the normal-state pseudogap or some interaction between the pseudogap state and the superconducting state 5-10 . However, to elucidate the precise relationship between the pseudogap and superconductivity, it is important to establish whether this broad phase-fluctuation regime vanishes, along with the pseudogap 11 , in the slightly overdoped region of the phase diagram where the superfluid pair density and correlation energy are both maximal 12 . Here we show, by tracking the restoration of the normal-state magnetoresistance in overdoped La 2−x Sr x CuO 4 , that the phase-fluctuation regime remains broad across the entire superconducting composition range. The universal low phase stiffness is shown to be correlated with a low superfluid density 1 , a characteristic of both underdoped and overdoped cuprates 12-14 . The formation of the pseudogap, by inference, is therefore both independent of and distinct from superconductivity.In underdoped cuprates, an energy gap (pseudogap), of as yet unknown origin, appears in the electronic density of states well before superconductivity develops. The continuous evolution 6 of the pseudogap into the superconducting gap, combined with similarities in their gap magnitudes and symmetries 5 , has led to suggestions that the pseudogap is a precursor superconducting state 7-10 characterized by a broad temperature region over which the superconducting order parameter is finite but the phase fluctuates 3,4 . This picture of precursor pairing remains controversial however and is challenged by measurements indicating that the pseudogap itself closes at a critical doping concentration 11 , slightly beyond optimal doping, where superconductivity is most robust 12 . As it stands, there have been very few studies to date of the fluctuating superconductivity in overdoped, superconducting cuprates to establish the precise relationship between the pseudogap and phase fluctuation regimes.To address this, we focus here on the evolution of the upper critical field H c2 with temperature, as inferred by measurements of the in-plane resistivity ρ ab (T ,H ) in pulsed and d.c. magnetic fields. Previous transport studies in cuprates identified H c2 (T ) with the 'knee' at or near the top of the ρ ab (T ) curve or the temperature at which ρ ab (H ) attained a certain fraction of the normal-state value 15 . Either technique would lead to a H c2 (T ) line with a markedly different shape from that determined by the Nernst effect, for example. In this study, we adopt an alternative approach 16,17 , using the evolution of the transverse magnetoresistance ρ ab (H )(= ρ ab (H )− ρ ab (0) with H c) with temperature, field and doping, as ...

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confidence: 56%

Phase-fluctuating superconductivity in overdoped La2−xSrxCuO4

Rourke

Mouzopoulou

et al. 2011

Nature Phys

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“…It should be noted that the obtained T * ρ ab agrees very well with the estimated T * ρ ab when using a different method, i.e., resistivity curvature mapping (RCM). 31) By further increased doping, T * ρ ab becomes difficult to determine and instead an upward curvature appears, indicating that the system enters into the overdoped region. 25) When we apply a magnetic field, we observe a marked positive MR near T c .…”

Section: Methodsmentioning

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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“…The superconductivity in this class of materials is unexpected because most Fe-based compounds display strong magnetic behavior. The iron arsenides share a number of general features with the high-temperature superconducting cuprates, including high T c 's, proximity to a magnetically ordered state, and a linear temperature dependence of the resistivity [7,8]. These properties suggest that the superconductivity in the iron arsenides is unconventional, with electron pairing possibly mediated by magnetic interactions.…”

Section: Introductionmentioning

confidence: 94%

Electronic and magnetic phase diagram of β-Fe1.01Se with superconductivity at 36.7 K under pressure

et al. 2009

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Electronic Phase Diagram of High-TcCuprate Superconductors from a Mapping of the In-Plane Resistivity Curvature

Cited by 366 publications

References 32 publications

Phase-fluctuating superconductivity in overdoped La2−xSrxCuO4

Phase-fluctuating superconductivity in overdoped La2−xSrxCuO4

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

Electronic and magnetic phase diagram of β-Fe1.01Se with superconductivity at 36.7 K under pressure

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Electronic Phase Diagram of High-TcCuprate Superconductors from a Mapping of the In-Plane Resistivity Curvature

Cited by 366 publications

References 32 publications

Phase-fluctuating superconductivity in overdoped La2−xSrxCuO4

Phase-fluctuating superconductivity in overdoped La2−xSrxCuO4

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

Electronic and magnetic phase diagram of β-Fe1.01Se with superconductivity at 36.7 K under pressure

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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