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Kanigel, Amit; Keren, Amit; Eckstein, Y.; Knizhnik, A.; Lord, J. S.; Amato, A.

doi:10.1103/physrevlett.88.137003

Cited by 43 publications

(46 citation statements)

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“…If one plots T c /T max c as a function of K(x)∆y, where ∆y = y − 7.15, and chooses K(x) so that all T c /T max c domes collapse to a single curve, then, T g /T max c lines collapse to a single one too. 26 This fact indicates that the same single energy scale controls both the SC and magnetic transitions. As a consequence, ∆ c has the magnetic origin.…”

Section: Magnetic Origin Of ∆ Cmentioning

confidence: 99%

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MECHANISM OF HIGH-T_c SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES

Mourachkine

2005

Mod. Phys. Lett. B

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The main purpose of this brief review is to present a sketch of the mechanism of high-Tc superconductivity based mainly on tunneling measurements in cuprates. In the review, we shall mostly discuss tunneling spectroscopy in Bi 2 Sr 2 CaCu 2 O 8 . Analysis of the data shows that the Cooper pairs in cuprates are topological excitations (e.g. quasi-one dimensional bisolitons, discrete breathers etc.), and the phase coherence among the Cooper pairs appears due to spin fluctuations.

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Section: Magnetic Origin Of ∆ Cmentioning

confidence: 99%

“…6,7,17,23,24,25,26,27 In other words, the long-range phase coherence in cuprates is mediated by spin fluctuations. Consider just a few facts.…”

Section: Magnetic Origin Of ∆ Cmentioning

confidence: 99%

MECHANISM OF HIGH-T_c SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES

Mourachkine

2005

Mod. Phys. Lett. B

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“…Here the electronic spins in the CuO 2 planes fluctuate so fast that they do not affect the muon polarization. At low enough temperatures, typical of other spin glass systems, 18,[20][21][22][23][24][25] there is a fast relaxation due to a static distribution of random local fields, followed by a long-time tail with a slower relaxation resulting from remnant dynamical processes within the spin glass. By decoupling experiments in a longitudinal field we also confirmed the static nature of the magnetic ground state and at very low temperatures oscillations in the asymmetry were observed for pр0.08.…”

mentioning

confidence: 99%

“…Between the high and low temperature limits the spin correlations slow down through the experimental SR time window and modify the depolarization process in a distinctive fashion. [22][23][24][25] To study the doping dependence of this slowing down we determine two characteristic temperatures. ͑i͒ The temperature, T f , where the spin correlations first enter the SR time window, i.e., where the muon asymmetry first deviates from Gaussian behavior and ͑ii͒ the temperature, T g , at which these correlations freeze into a glassy state thus causing an initial rapid decay in the asymmetry.…”

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confidence: 99%

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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“…1(a). T c was measured by resistivity [4], and the spin glass temperature T g [5] and T N [6] by muon spin relaxation. Despite the rich phase diagram, the different CLBLCO families have negligible structural differences.…”

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confidence: 99%

Experimental investigation of the origin of the crossover temperature in cuprate superconductors via dc magnetic susceptibility

Lubashevsky

Keren

2008

Phys. Rev. B

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We investigate the cross-over temperature T * as a function of doping in (CaxLa1−x)(Ba1.75−xLa0.25+x)Cu3Oy, where the maximum Tc (T max c ) varies continuously by 30% between families (x) with minimal structural changes. T * is determined by DC-susceptibility measurements. We find that T * scales with the maximum Néel temperature T max N of each family. This result strongly supports a magnetic origin of T * , and indicates that three dimensional interactions play a role in its magnitude.PACS numbers: 74.25. Dw,74.25.Ha, Free electrons do not have high temperature crossovers such as a pseudogap (PG), spin gap (SG), or development of antiferromagnetic (AFM) correlations. In the cuprates all of these exist, yet the interactions that lead to them are not completely clear. Nevertheless, the crossovers occur at a temperature T * which is much higher than T c , and closer to the three dimensional (3D) ordering temperature of the parent compound in the AFM state. Therefore, it is speculated that T * emerges from AFM fluctuations, and that the cross-overs are intimately linked, namely, the interaction responsible for one might be responsible for all [1,2,3]. Therefore, it is crucial to test the possibility of correlations between T ⋆ of a particular system and its magnetic properties, such as the Néel temperature T N of the parent compound, or its constituents, the in-and out-of-plane Heisenberg coupling constant J and J ⊥ , respectively. This is the motivation of the work presented here. We provide experimental evidence that strongly supports a magnetic origin for T * . Moreover, we show that T * stems from 3D interactions, similar to the Néel order, involving both J and J ⊥ .We investigate the origin of the T ⋆ by studying its variations as a function of the compound's magnetic properties, where small chemical changes are an implicit parameter. The variations in the magnetic properties are achieved by using four different families of the (Ca x La 1−x )(Ba 1.75−x La 0.25+x )Cu 3 O y (CLBLCO) system, having the YBa 2 Cu 3 O y (YBCO) structure, with x = 0.1 . . . 0.4. The phase diagram of the CLBLCO families is shown in Fig. 1(a). T c was measured by resistivity [4], and the spin glass temperature T g [5] and T N [6] by muon spin relaxation. Despite the rich phase diagram, the different CLBLCO families have negligible structural differences. All compounds are tetragonal, and there is no oxygen chain ordering as in YBCO [4]. The hole concentration in the CuO 2 planes does not depend on x [7,8]. The difference in the unit cell parameters a and c/3 between the two extreme families (x = 0.1 and 0.4) is 1% [4]. Thus, variations in T max c due to variations in ionic radii are not relevant [9]. The level of disorder, as detected by Cu and Ca nuclear magnetic resonance, is also identical for the different families [8,10]. In fact, the only strong variation between families noticed at present is the in-plane oxygen buckling angle [11]. This property can modify the intraplane near-and next-nearneighbors hopping, or interplane hoppi...

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Common Energy Scale for Magnetism and Superconductivity in Underdoped Cuprates: A Muon Spin Resonance Investigation of(CaxLa1−x

Cited by 43 publications

References 20 publications

MECHANISM OF HIGH-T_c SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES

MECHANISM OF HIGH-T_c SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES

Evidence for a generic quantum transition in high-Tccuprates

Experimental investigation of the origin of the crossover temperature in cuprate superconductors via dc magnetic susceptibility

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Common Energy Scale for Magnetism and Superconductivity in Underdoped Cuprates: A Muon Spin Resonance Investigation of(CaxLa1−x

Cited by 43 publications

References 20 publications

MECHANISM OF HIGH-Tc SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES

MECHANISM OF HIGH-Tc SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES

Evidence for a generic quantum transition in high-Tccuprates

Experimental investigation of the origin of the crossover temperature in cuprate superconductors via dc magnetic susceptibility

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Product

Resources

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MECHANISM OF HIGH-T_c SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES

MECHANISM OF HIGH-T_c SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES