Effects of carrier concentration on the superfluid density of high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>cuprates

Panagopoulos, C.; Rainford, B.D.; Cooper, J. R.; Lo, Wai; Tallon, J. L.; Loram, J. W.; Betouras, Joseph J.; Wang, Y. S.; Chu, C. W.

doi:10.1103/physrevb.60.14617

Cited by 110 publications

(158 citation statements)

References 34 publications

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“…7 the normalized superfluid density ρ s (T )/ρ s (0) as a function of T /T c at various doping. In the overdoped regime, where the pseudogap closes, we recover the standard d-wave mean field result, which seems in a good agreement with experimental data [16] (see the curve for δ = 0.22 in Fig. 7).…”

Section: Conclusion and Discussionsupporting

confidence: 89%

Gap and pseudogap evolution within the charge-ordering scenario for superconducting cuprates

2000

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Abstract. We describe the spectral properties of underdoped cuprates as resulting from a momentumdependent pseudogap in the normal state spectrum. Such a model accounts, within a BCS approach, for the doping dependence of the critical temperature and for the two-parameter leading-edge shift observed in the cuprates. By introducing a phenomenological temperature dependence of the pseudogap, which finds a natural interpretation within the stripe quantum-critical-point scenario for high-Tc superconductors, we reproduce also the Tc − T * bifurcation near optimum doping. Finally, we briefly discuss the different role of the gap and the pseudogap in determining the spectral and thermodynamical properties of the model at low temperatures.

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Section: Conclusion and Discussionsupporting

confidence: 89%

Gap and pseudogap evolution within the charge-ordering scenario for superconducting cuprates

2000

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“…Debye-Scherrer x-ray scans showed that approximately 90% of the grains had their CuO 2 planes aligned to within approximately 2°. The values of ab (0) Ϫ2 for samples with pу0.15 were also confirmed by standard TF SR experiments performed on unaligned powders at 400 G. 12,13 Figure 1 shows the typical time dependence at several temperatures of the ZF muon asymmetry [20][21][22][23] 01. In all samples the high-temperature form of the depolarization is Gaussian and temperature independent, consistent with dipolar interactions between the muons and their near-neighbor nuclear moments.…”

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confidence: 59%

“…19, just beyond optimal doping, 10,11 a behavior rather analogous to the quantum-critical heavy-fermion materials. 9 Many fundamental physical quantities such as the superconducting condensation energy, 10,11 the superfluid density, 12,13 and the quasiparticle weight, 10,14 show abrupt changes as p→p c . While compelling in their totality, 10,11 none of the results can be considered as evidence of a quantum transition.…”

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confidence: 99%

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Evidence for a generic quantum transition in high-Tccuprates

Tallon²,

et al. 2002

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We study the low-energy spin fluctuations and superfluid density of a series of pure and Zn-substituted high-T c superconductors ͑HTS͒ using the muon spin relaxation and ac-susceptibility techniques. At a critical doping state, p c , we find ͑i͒ simultaneous abrupt changes in the magnetic spectrum and in the superconducting ground state and ͑ii͒ that the slowing down of spin fluctuations becomes singular at Tϭ0. These results provide experimental evidence for a quantum transition that separates the superconducting phase diagram of HTS into two distinct ground states. DOI: 10.1103/PhysRevB.66.064501 PACS number͑s͒: 74.72.Ϫh, 74.25.Ha, 75.40.Ϫs, 76.75.ϩi Quantum phase transitions occur at zero temperature at a critical electron density separating distinct ground states. Near a quantum critical point, electrons in metals are highly correlated and the diverging fluctuations may induce unconventional superconductivity. [1][2][3][4][5][6][7][8] For example, in certain heavy fermion compounds a ''bubble'' of superconductivity occurs around the quantum critical point at which itinerant antiferromagnetism is suppressed by applied pressure. 9 The search for an underlying quantum phase transition in high-T c superconductors ͑HTS͒ is motivated by the potential for quantum fluctuations to bind electronic carriers into superconducting Cooper pairs and also to cause the celebrated linear temperature dependence of their electrical resistivity. [1][2][3][4][5][6][7][8]10 HTS exhibit a common generic phase diagram in which the superconducting transition temperature, T c , rises to a maximum at an optimal doping of approximately 0.16 holes per planar copper atom and then falls to zero on the overdoped side. In addition the underdoped normal state exhibits correlations, which introduce a gap in the density of states that strongly affects all physical properties. There is no phase transition associated with the opening of this gap and so it is called a pseudogap. Analysis of specific heat data, for example, suggests that the pseudogap energy decreases with doping and falls to zero at a critical doping of p c Ӎ0.19, just beyond optimal doping, 10,11 a behavior rather analogous to the quantum-critical heavy-fermion materials. 9 Many fundamental physical quantities such as the superconducting condensation energy, 10,11 the superfluid density, 12,13 and the quasiparticle weight, 10,14 show abrupt changes as p→p c . While compelling in their totality, 10,11 none of the results can be considered as evidence of a quantum transition. In particular there is no evidence for an associated order parameter and slowing down of the relevant fluctuations. With this in mind we examined the evolution with doping of the low-energy spin fluctuation spectrum using muon spin relaxation ( SR) combined with low-field ac-susceptibility measurements of the superfluid density.The samples studied were: ͑i͒ La 2Ϫx Sr x Cu 1Ϫy Zn y O 4 ͑LSCO͒ (xϭ0.03-0.24 and yϭ0, 0.01, and 0.02͒. Samples were synthesized using solid-state reaction and where necessary follow...

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“…(We do not consider the wider class of materials discussed by Uemura [2]). To set the scene we show in field muon spin relaxation (µSR) studies [9] while the La-214 data are from ac susceptibility and µSR studies [10]. ρ s (0) data for Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212) were obtained from fielddependent thermodynamic measurements [11].…”

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confidence: 99%

Superfluid density in cuprate high-Tcsuperconductors: A new paradigm

Tallon¹,

et al. 2003

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The doping dependence of the superfluid density, ρ s ≡ λ ab -2 ∝ n s /m*, of high-T c superconductors is usually considered in the context of the Uemura relation, namely T c proportional to ρ s , which is generally assumed to apply in the underdoped regime. We show that a modified plot of T c /∆ 0 versus ρ s , where ∆ 0 is the maximum d-wave gap at T=0, exhibits universal features that point to an alternative interpretation of the underlying physics. In the underdoped region this plot exhibits the canonical negative curvature expected when a ground-state correlation competes with superconductivity (SC) by opening up a gap in the normal-state DOS. In particular ρ s is suppressed much faster than T c /∆ 0 or indeed T c . The pseudogap is found to strongly modify the SC ground state. PACS numbers 74.25.Ha, 74.25.Bt, 76.75.+i

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Effects of carrier concentration on the superfluid density of high-Tccuprates

Cited by 110 publications

References 34 publications

Gap and pseudogap evolution within the charge-ordering scenario for superconducting cuprates

Gap and pseudogap evolution within the charge-ordering scenario for superconducting cuprates

Evidence for a generic quantum transition in high-Tccuprates

Superfluid density in cuprate high-Tcsuperconductors: A new paradigm

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