Superconductivity-Induced Phonon Renormalization in (Cu,C)Ba2Ca3Cu4Oz Superconductor

Hadjiev, V. G.; Cardona, M.; Du, Z. L.; Xue, Y. Y.; Chu, C. W.

doi:10.1002/(sici)1521-3951(199801)205:1<r1::aid-pssb99991>3.0.co;2-v

Cited by 9 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The collective excitation in the multiband superconductor was also examined theoretically by Kochorbé and Palistrant [140]. Hadjiev et al [141,142]. Limonov et al [143], and Tanaka et al [144,145] measured the Raman spectra of the multilayer cuprate superconductor.…”

Section: Leggett Modementioning

confidence: 99%

Multicomponent superconductivity based on multiband superconductors

Tanaka¹

2015

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Multicomponent superconductivity is realized in multiband superconductors when an interband pairing interaction is considerably weaker than the intraband interactions. There is a new quantum phase that originates from the interband phase difference in this superconducting condensate. Firstly, we discuss the applicability of this physical viewpoint for known multiband superconductors. Secondly, topics related to the interband phase difference are treated. Finally, we mention that the Bardeen–Cooper–Schrieffer formalism and the Ginzburg–Landau formalism may not be fully guaranteed when we introduce a fluctuation in the interband phase difference mode. We also address plausible new superconducting electronics using the interband phase difference.

show abstract

Section: Leggett Modementioning

confidence: 99%

Multicomponent superconductivity based on multiband superconductors

Tanaka¹

2015

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Fig. 11 Raman spectra at various temperatures in Hg-1234 with Tc ~ 123 K. 103 Besides phonon frequency and width, large changes in phonon intensity were also found in many cuprate superconductors when crossing Tc [29,101,103,[105][106][107][108][109][110] . A representative example is Hg-1234 [103] , as shown in Fig.…”

Section: Iii32 Phonon Intensitiesmentioning

confidence: 99%

Electron—phonon coupling in cuprate and iron-based superconductors revealed by Raman scattering

Zhang¹,

Zhang²

2013

Chinese Phys. B

View full text Add to dashboard Cite

Electron-phonon coupling (EPC) is one of the most common and fundamental interactions in solids. It not only dominates many basic dynamic processes like resistivity, thermal conductivity etc, but also provides the pairing glue in conventional superconductors. But in high-temperature superconductors (HTSC), it is still controversial whether or not EPC is in favor of paring. Despite the controversies, many experiments have provided clear evidence for EPC in HTSC. In this paper, we briefly review EPC in cuprate and iron-based superconducting systems revealed by Raman scattering. We introduce how to extract the coupling information through phonon lineshape. Then we discuss the strength of EPC in different HTSC systems and possible factors affecting the strength. The comparative study between Raman phonon theories and experiments allows us to gain insight into some crucial electronic properties, especially superconductivity. Finally we summarize and compare EPC in the two existing HTSC systems, and discuss what role it may play in HTSC.

show abstract

“…Except for some recent investigations of mercury or carbonate based four-layer compounds [8,53], most of the self-energy studies have been carried out on the R-123 system. In contrast, 2D peaks, which are a signature of pair-breaking excitations, have been investigated in various cuprate families such as the single-layer compounds La 2Àx Sr x CuO 4Àd (Ref.…”

mentioning

confidence: 99%

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

Böck

1999

Ann. Phys.

View full text Add to dashboard Cite

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.

show abstract

Superconductivity-Induced Phonon Renormalization in (Cu,C)Ba2Ca3Cu4Oz Superconductor

Abstract: physF sttF solF @A PHSD I @IWWVA ujet lssifitionX URFPSFuY UVFQHFrvY IHFIS uperondutivityEsndued honon enormliztion in @guDgAf P g Q gu R y z uperondutor FqF rdjiev @AD wF grdon @AD FvF hu @AD FF ue @AD nd gFF ghu @A

Cited by 9 publications

References 3 publications

Multicomponent superconductivity based on multiband superconductors

Multicomponent superconductivity based on multiband superconductors

Electron—phonon coupling in cuprate and iron-based superconductors revealed by Raman scattering

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

Contact Info

Product

Resources

About