Strong superconductivity-induced phonon self-energy effects in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">HgBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mro

Hadjiev, V. G.; Zhou, Xingjiang; Strohm, Thomas; Cardona, M.; Lin, Q. M.; Chu, C. W.

doi:10.1103/physrevb.58.1043

Cited by 83 publications

(83 citation statements)

References 29 publications

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“…The enhanced phonon lines at 260 and 390 cm -1 in Bi-2223 can be ascribed to the A 1g -vibration of Ca with oxygen in the outer CuO 2 -planes, following the mode assignment of the phonon lines in Hg-1234 [34]. The asymmetric line shapes of these phonons result from quantum interference to the electronic counter part.…”

Section: Resultsmentioning

confidence: 99%

“…6, we present the 10K-Raman scattering from the samples of polycrystalline Hg-1234, Hg-1223, Tl-1223 and t he single crystal of Y-123 at red (1.92eV) and blue (2.54 eV) laser exci tations. For Hg-1234, the strong enhancement of the Ca-phonon peaks , accompanied by the strong 2∆(A 1g )-peak at 600 cm -1 , was first observed at E exc =1.92eV by Hadjiev et al [34].…”

Section: Resultsmentioning

confidence: 99%

“…One exhibits a broad spectrum peaking at about 300 cm -1 and the other, which mainly interacts with the relevant phonons, shows a sharp pair-breaking peak at 580 cm -1 . For the time being, we use a "standard" Fano approach [33,34,37]. As was shown in our previous paper [37], for a single component background the "standard" Fano procedure and the Green's function analysis give essentially the same r enormalized phonon parameters (frequency, line-width and intensity) both above and below Tc, if we assume an appropriate electronic background function g( ω) in the Fano analysis.…”

Section: Resultsmentioning

confidence: 99%

“…Here, the 2∆-peak intensities are normalized by the continuum intensity at 1000cm -1 . In Fig.4b, the renormalized phonon intensities I p = AΓq 2 [33,34] for the 260 and 390 cm -1 phonon lines in Bi-2223 are plotted as a function of E exc . For Bi-2223, the resonant phenomenon is evident, although the data does not reach a maximum.…”

Section: Resultsmentioning

confidence: 99%

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Superconductivity-induced resonant Raman scattering in multilayer high-Tcsuperconductors

et al. 2002

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Resonant Raman scattering below T c has been discovered in several Bi-, Hg-, Tl-based high-Tc superconductors with three or four CuO2-layers. For Bi 2 Si 2 Ca 2 Cu 3 O 10+ δ , we found an unexpected crossover of the pair-breaking peak in the A 1g -spectrum from a broad bump at hω = 6k B T c for E exc = 2.54eV to a sharp peak at hω = 8kBTc for Eexc = 2.18eV, together with a strong enhancement of the Ca-phonons. Under resonant conditions, the relative positions of the pair breaking peaks in A 1g , B 1g , and B 2g channels are 2∆(A 1g ) = 2∆(B 1g ) > 2∆ (B 2g ). This relation implies that the A 1g Raman channel is free from the Coulomb screening effect, just as predicted theoretically for a d-wave multi-layer superconductor but have never been observed experimentally thus far. The observed resonance effect is the evidence that the electronic state in the inner CuO 2 -planes is different from that of the outer CuO 2 -planes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Superconductivity-induced resonant Raman scattering in multilayer high-Tcsuperconductors

et al. 2002

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“…Some of the phonon modes in the high-T c cuprate superconductors are strongly renormalized when going from the normal to the superconducting state [1,2,3,4,5,6,7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Phonon anomalies in trilayer high-Tc cuprate superconductors

Dubroka

Munzar

2004

Physica C: Superconductivity

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We present an extension of the model proposed recently to account for dramatic changes below T c (anomalies) of some c-axis polarized infrared-active phonons in bilayer cuprate superconductors, that applies to trilayer high-T c compounds. We discuss several types of phonon anomalies that can occur in these systems and demonstrate that our model is capable of explaining the spectral changes occurring upon entering the superconducting state in the trilayer compound Tl 2 Ba 2 Ca 2 Cu 3 O 10 . The low-temperature spectra of this compound obtained by Zetterer and coworkers display an additional broad absorption band, similar to the one observed in underdoped YBa 2 Cu 3 O 7−δ and Bi 2 Sr 2 CaCu 2 O 8 . In addition, three phonon modes are strongly anomalous. We attribute the absorption band to the transverse Josephson plasma resonance, similar to that of the bilayer compounds. The phonon anomalies are shown to result from a modification of the local fields induced by the formation of the resonance. The spectral changes in Tl 2 Ba 2 Ca 2 Cu 3 O 10 are compared with those occurring in Bi 2 Sr 2 Ca 2 Cu 3 O 10 , reported recently by Boris and coworkers.

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Electronic Raman scattering and phonon self-energy effects in theR-123 system: Signatures of gap and pseudogap

Böck

1999

Ann. Phys.

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Using Raman spectroscopy and transport measurements we investigate thin epitaxial films of Y 1Àx (Pr, Ca) x Ba 2 Cu 3 O 6y . We explore the electronic Raman responses in A 1g , B 1g , and B 2g symmetry obtained after subtraction of phononic excitations, and especially, the 2D peaks that form out of the electronic background below T c . We find that the energy of the B 1g 2D peak, which is a measure of the gap value, increases monotonically with decreasing doping until the peak becomes unresolvable. In contrast, the peak in A 1g symmetry follows T c being still resolvable in the Pr-doped films. The B 2g response is weak and a 2D peak is only detected at the highest doping level. As a consequence of strong electron-phonon coupling, the B 1g phonon at $340 cm À1 exhibits a pronounced Fano-type line shape. We use a phenomenological model to describe the line shape that takes into account real and imaginary part of the electronic response. It allows us to obtain the self-energy corrections and the mass-enhancement factor l as a measure of the coupling. In the normal state we find l 0X015 around optimal doping and decreasing values with decreasing doping. The electron-phonon coupling increases strongly below T c in overdoped samples in which the B 1g 2D peaks appear in the vicinity of the phonon. Self-energy effects observed in the superconducting state can only partly be assigned to the redistributing electronic response. Anomalies with respect to frequency, linewidth, and intensity remain. They appear at increasing temperatures with decreasing doping and we provide evidence that they are connected to the presence of the pseudogap. We supplement our study by a comparison with single crystal data and investigate the influence of site-substitutional disorder on the electronic response and the electronphonon interaction.Since the discovery of the cuprate high-temperature superconductors (HTS) [1] it has been established that the important common feature of all cuprates are the copper-oxygen (CuO 2 ) planes. Even though not discovered yet, it is believed that the mechanism causing the high transition temperatures T c is located in and related to these planes. Often discussed candidates for the pairing mechanism are an exchange of antiferromagnetic fluctuations [2Ð3] or interlayer tunneling [4,5]. The role phonons play in the mechanism is not resolved [6Ð8]. Isotope experiments indicate that phonons may be involved [9], at least away from optimal doping which is near $ 0X16 holes per plane in the unit cell.

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Strong superconductivity-induced phonon self-energy effects inHgBa2Ca3Cu

Cited by 83 publications

References 29 publications

Superconductivity-induced resonant Raman scattering in multilayer high-Tcsuperconductors

Superconductivity-induced resonant Raman scattering in multilayer high-Tcsuperconductors

Phonon anomalies in trilayer high-Tc cuprate superconductors

Electronic Raman scattering and phonon self-energy effects in theR-123 system: Signatures of gap and pseudogap

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