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Panfilov, A. G.; Лимонов, М. Ф.; Rykov, Alexandre I.; Tajima, S.; Yamanaka, Akio

doi:10.1103/physrevb.57.r5634

Cited by 20 publications

(21 citation statements)

References 22 publications

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“…Additional weak features close to 200 cm −1 and between 500 and 630 cm −1 correspond to infrared forbidden modes due to slight CuO chains disorder. [17][18][19] Entering into the superconducting state, we observe a redistribution of the spectral weight from the lowenergy region to the high one ͑400-800 cm −1 ͒. The weak phonon features are located inside the region where the background redistribution induced by superconductivity takes place.…”

Section: Experimental Results and Data Analysismentioning

confidence: 92%

Investigations of the relationship betweenTcand the superconducting gap under magnetic and nonmagnetic impurity substitutions inYBa2Cu

et al. 2007

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We report electronic Raman scattering measurements on optimally doped YBa 2 Cu 3 O 7−␦ where Zn or Ni impurities have been substituted by Cu. Using Raman selection rules, we have probed the superconducting gap in the nodal and antinodal regions. We show that under impurity substitutions, the energy of the antinodal peak detected in the superconducting state is not related to the critical temperature T c and that signatures of superconductivity disappear in the nodal regions. Our experimental findings advocate in favor of gapless arcs around the nodes. The breakdown of the relationship between the antinodal gap amplitude and T c is discussed in terms of local superconducting gap and pseudogap.

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Section: Experimental Results and Data Analysismentioning

confidence: 92%

Investigations of the relationship betweenTcand the superconducting gap under magnetic and nonmagnetic impurity substitutions inYBa2Cu

et al. 2007

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“…The asymmetry in YBCO has been studied in-depth, especially for the buckling B 1g mode of oxygen. Thomsen et al and Cooper et al first reported the asymmetry of the B 1g mode at 340 cm -1 [44,45] , which was confirmed by further Raman measurements [46][47][48][49][50][51][52][53][54][55][56] . As shown in Fig.…”

Section: Iii1 Fano Effectmentioning

confidence: 78%

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

Zhang¹,

Zhang²

2013

Chinese Phys. B

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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.

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“…31 In YBCO crystals with fully oxygenated chains, these two modes are Raman forbidden but infrared allowed ͑B 1u symmetry͒. [37][38][39] They become Raman active due to breaking of the translational symmetry by defects, i.e., unoccupied oxygen positions in the Cu1-O1 chains. [29][30][31] The absence of the strong mode at 579 cm −1 in the data with xx polarization confirms the high detwinning ratio of our crystal ͑ϳ95%͒.…”

Section: Methodsmentioning

confidence: 98%

Electronic and phononic Raman scattering in detwinnedYBa2Cu3O6.95and
Bakr
¹
,
Schnyder
²
,
Klam
³

et al. 2009
Phys. Rev. B
34
3
34
0
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Inelastic light ͑Raman͒ scattering has been used to study electronic excitations and phonon anomalies in detwinned, slightly overdoped YBa 2 Cu 3 O 6.95 and moderately overdoped Y 0.85 Ca 0.15 Ba 2 Cu 3 O 6.95 single crystals. In both samples modifications of the electronic pair-breaking peaks when interchanging the a and b axis were observed. The lineshapes of several phonon modes involving plane and apical oxygen vibrations exhibit pronounced anisotropies with respect to the incident and scattered light-field configurations. Based on a theoretical model that takes both electronic and phononic contributions to the Raman spectra into account, we attribute the anisotropy of the superconductivity-induced changes in the phonon lineshapes to a small s-wave admixture to the d x 2 −y 2 pair wave function. Our theory allows us to disentangle the electronic Raman signal from the phononic part and to identify corresponding interference terms. We argue that the Raman spectra are consistent with an s-wave admixture with an upper limit of 20%.

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Superconductivity-induced effect on “Raman-forbidden” modes in underdopedYBa2Cu3O

Cited by 20 publications

References 22 publications

Investigations of the relationship betweenTcand the superconducting gap under magnetic and nonmagnetic impurity substitutions inYBa2Cu

Investigations of the relationship betweenTcand the superconducting gap under magnetic and nonmagnetic impurity substitutions inYBa2Cu

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

Electronic and phononic Raman scattering in detwinnedYBa2Cu3O6.95and
Bakr
¹
,
Schnyder
²
,
Klam
³

et al. 2009
Phys. Rev. B
34
3
34
0
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Superconductivity-induced effect on “Raman-forbidden” modes in underdopedYBa2Cu3O

Cited by 20 publications

References 22 publications

Investigations of the relationship betweenTcand the superconducting gap under magnetic and nonmagnetic impurity substitutions inYBa2Cu

Investigations of the relationship betweenTcand the superconducting gap under magnetic and nonmagnetic impurity substitutions inYBa2Cu

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

Electronic and phononic Raman scattering in detwinnedYBa2Cu3O6.95andBakr1, Schnyder2, Klam3 et al. 2009Phys. Rev. B343340View full textAdd to dashboardCite

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Electronic and phononic Raman scattering in detwinnedYBa2Cu3O6.95and
Bakr
¹
,
Schnyder
²
,
Klam
³

et al. 2009
Phys. Rev. B
34
3
34
0
View full text Add to dashboard Cite