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Kiefl, R. F.; Brewer, J. H.; Carolan, J. F.; Dosanjh, P.; Hardy, W. N.; Kadono, R.; Kempton, J. R.; Krahn, R.; Schleger, P.; Yang, Bingxin; Zhou, Huairong; Luke, G. M.; Sternlieb, B. J.; Uemura, Y. J.; Kossler, W. J.; Yu, Xiao-Dong; Ansaldo, Eduardo J.; Takagi, H.; Uchida, S.; Seaman, C. L.

doi:10.1103/physrevlett.63.2136

Cited by 106 publications

(44 citation statements)

References 25 publications

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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.…”

mentioning

confidence: 68%

“…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.…”

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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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confidence: 68%

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confidence: 99%

Evidence for a generic quantum transition in high-Tccuprates

Tallon²,

et al. 2002

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“…The ZF-µSR signals for p < 0.08 superconducting samples of YBa 2 Cu 3 O y at low temperature are characterized by a rapidly damped oscillation at early times [122,129,130]. An example of this is shown in figure 16 for YBa 2 Cu 3 O 6.37 .…”

Section: Magnetism In Zero Applied Magnetic Fieldmentioning

confidence: 99%

“…While these experiments suggested that static magnetism and superconductivity coexist, there was considerable worry that the samples studied contained an inhomogeneous concentration of copper magnetic moments due to nonuniform doping of holes [124]. Subsequent ZF-µSR experiments on pure La 2−x Sr x CuO 4 indicated that static electronic moments are not present in samples with strontium content as high as x = 0.15 [122,125,126], although the extrapolated T → 0 K critical value of x for the onset of static magnetism has never been accurately determined. At dopings above where static magnetism is not observed in ZF-µSR experiments, magnetic fluctuations persist that are visible by NMR and inelastic neutron scattering.…”

Section: Magnetism In Zero Applied Magnetic Fieldmentioning

confidence: 99%

Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors

Sonier

2007

Rep. Prog. Phys.

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The focus of this article is on recent progress in muon spin rotation (µSR) studies of the vortex cores in type-II superconductors. By comparison of µSR measurements of the vortex-core size in a variety of materials with results from techniques that directly probe electronic states, the effect of delocalized quasiparticles on the spatial variation of field in a lattice of interacting vortices has been determined for both single-band and multi-band superconductors. These studies demonstrate the remarkable accuracy of what some still consider an exotic technique. In recent years µSR has also been used to search for magnetism in and around the vortex cores of high-temperature superconductors. As a local probe µSR is specially suited for detecting static or quasistatic magnetism having short-range or random spatial correlations. As discussed in this review, µSR experiments support a generic phase diagram of competing superconducting and magnetic order parameters, characterized by a quantum phase transition to a state where the competing order is spatially non-uniform.

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“…In particular, it enables a reliable determination of the volume fractions of the magnetic and superconducting phases and it can also be used to determine the temperature and doping dependence of the magnetic and superconducting order parameters. It has previously been very successfully applied to study the coexistence of magnetism and superconductivity in a variety of unconventional superconductors such as the underdoped cuprates, [37][38][39][40] the ruthenate cuprates, 41 the triplet superconductor Sr 2 RuO 4 (Ref. 42), or more recently the iron arsenides 11,12,15,17,19,20,[43][44][45][46][47] and iron selenides.…”

Section: Methodsmentioning

confidence: 99%

Muon spin rotation study of magnetism and superconductivity in Ba(Fe1−xCox)2
Bernhard
¹
,
Wang
²
,
Nuccio
³

et al. 2012
Phys. Rev. B
54
22
87
1
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Publication date: 2012 Document VersionPublisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Bernhard, C., Wang, C. N., Nuccio, L., Schulz, L., Zaharko, O., Larsen, J., ... Niedermayer, C. (2012). Muon spin rotation study of magnetism and superconductivity in Using muon spin rotation (μSR) we investigated the magnetic and superconducting properties of a series of Ba(Fe 1−x Co x ) 2 As 2 single crystals with 0 x 0.15. Our study details how the antiferromagnetic order is suppressed upon Co substitution and how it coexists with superconductivity. In the nonsuperconducting samples at 0 < x < 0.04 the antiferromagnetic order parameter is only moderately suppressed. With the onset of superconductivity this suppression becomes faster and it is most rapid between x = 0.045 and 0.05. As was previously demonstrated by μSR at x = 0.055 [P. Marsik et al., Phys. Rev. Lett. 105, 57001 (2010)], the strongly weakened antiferromagnetic order is still a bulk phenomenon that competes with superconductivity. The comparison with neutron diffraction data suggests that the antiferromagnetic order remains commensurate whereas the amplitude exhibits a spatial variation that is likely caused by the randomly distributed Co atoms. A different kind of magnetic order that was also previously identified [C. Bernhard et al., New J. Phys. 11, 055050 (2009)] occurs at 0.055 < x < 0.075 where T c approaches the maximum value. The magnetic order develops here only in parts of the sample volume and it seems to cooperate with superconductivity since its onset temperature coincides with T c . Even in the strongly overdoped regime at x = 0.11, where the static magnetic order has disappeared, we find that the low-energy spin fluctuations are anomalously enhanced below T c . These findings point toward a drastic change in the relationship between the magnetic and superconducting orders from a competitive one in the strongly underdoped regime to a constructive one in near-optimally and overdoped samples.

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Muon-spin-rotation study of magnetism inLa1.85Sr0.15

Cited by 106 publications

References 25 publications

Evidence for a generic quantum transition in high-Tccuprates

Evidence for a generic quantum transition in high-Tccuprates

Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors

Muon spin rotation study of magnetism and superconductivity in Ba(Fe1−xCox)2
Bernhard
¹
,
Wang
²
,
Nuccio
³

et al. 2012
Phys. Rev. B
54
22
87
1
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Muon-spin-rotation study of magnetism inLa1.85Sr0.15

Cited by 106 publications

References 25 publications

Evidence for a generic quantum transition in high-Tccuprates

Evidence for a generic quantum transition in high-Tccuprates

Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors

Muon spin rotation study of magnetism and superconductivity in Ba(Fe1−xCox)2Bernhard1, Wang2, Nuccio3 et al. 2012Phys. Rev. B5422871View full textAdd to dashboardCite

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About

Muon spin rotation study of magnetism and superconductivity in Ba(Fe1−xCox)2
Bernhard
¹
,
Wang
²
,
Nuccio
³

et al. 2012
Phys. Rev. B
54
22
87
1
View full text Add to dashboard Cite