Pair breaking versus symmetry breaking: Origin of the Raman modes in superconducting cuprates

Munnikes, N.; Muschler, B.; Venturini, Francesca; Tassini, L.; Prestel, W.; Ono, Shimpei; Ando, Yoichi; Peets, Darren C.; Hardy, W. N.; Liang, Ruixing; Bonn, D. A.; Damascelli, A.; Eisaki, H.; Greven, M.; Erb, A.; Hackl, R.

doi:10.1103/physrevb.84.144523

Cited by 34 publications

(45 citation statements)

References 133 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(13) 64,65 . The B 1g and B 2g superconducting gaps were detected experimentally 77,82,85,94,95 . The absorption coefficient corrected low-energy spectra are shown in Fig.…”

mentioning

confidence: 94%

Superconducting pairing and the pseudogap in the nematic dynamical stripe phase of La_2−xSr_xCuO₄

Sugai

Takayanagi

Hayamizu

et al. 2013

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The individual k|| and k ⊥ stripe excitations in fluctuating spin-charge stripes have not been observed yet. Raman scattering has a unique selection rule that the combination of two electric field directions of incident and scattered light determines the observed symmetry. If we set, for example, two electric fields to two possible stripe directions, we can observe the fluctuating stripe as if it is static. Using the different symmetry selection rule between the B1g two-magnon scattering and the B1g and B2g isotropic electronic scattering, we succeeded to obtain the k|| and k ⊥ strip magnetic excitations separately in La2−xSrxCuO4. Only the k ⊥ stripe excitations appear in the wide-energy isotropic electronic Raman scattering, indicating that the charge transfer is restricted to the direction perpendicular to the fluctuating stripe. This surprising restriction is reminiscent of the Burgers vector of an edge dislocation in metal. The edge dislocation easily slides perpendicularly to an inserted stripe and causes ductility in metal. Hence charges at the edge of a stripe move together with the edge dislocation perpendicularly to the stripe, while other charges are localized. A looped edge dislocation has lower energy than a single edge dislocation. The superconducting coherence length is close to the inter-charge stripe distance at x ≤ 0.2. Therefore we conclude that Cooper pairs are formed at looped edge dislocations. The restricted charge transfer direction naturally explains the opening of a pseudogap around (0, π) for the stripe parallel to the b axis and the reconstruction of the Fermi surface to have a flat plane near (0, π). They break the four-fold rotational symmetry. Furthermore the systematic experiments revealed the carrier density dependence of the isotropic and anisotropic electronic excitations, the spin density wave and/or charge density wave gap near (π/2, π/2), and the strong coupling between the electronic states near (π/2, π/2) and the zone boundary phonons at (π, π).

show abstract

“…(13) 64,65 . The B 1g and B 2g superconducting gaps were detected experimentally 77,82,85,94,95 . The absorption coefficient corrected low-energy spectra are shown in Fig.…”

mentioning

confidence: 94%

Superconducting pairing and the pseudogap in the nematic dynamical stripe phase of La_2−xSr_xCuO₄

Sugai

Takayanagi

Hayamizu

et al. 2013

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…This may, in an intuitive way, explain why the B 1g Raman response from the anti-nodal part of the Brillouin zone but also other two-particle susceptibilities such as the NMR relaxation rate 4,82,84 get depressed or incoherent much earlier than the single-particle response 3 . We suggest that the suppression of the B 1g coherence peaks in the superconducting state 43,85,86 can also be traced back to fluctuations of incipient charge order. This, of course, implies that the fluctuations are also present in Y123 or Bi2212 with high T max c even if they do not manifest themselves in an AL-type response at p > 0.05.…”

Section: Phase Diagrammentioning

confidence: 99%

“…Wakimoto et al 55 found the incommensurate spin order also to disappear there. If one examines the B 1g gap maxima on the overdoped side of the phase diagram 28,33,86,[89][90][91] , it becomes clear that the intensity increases beyond p = 0.21, which can hardly be traced back to coherence. Actually, the increase is so fast that a divergence point may be anticipated.…”

Section: Phase Diagrammentioning

confidence: 99%

“…Actually, the increase is so fast that a divergence point may be anticipated. To explore this possibility Munnikes and coworkers 86 plot the inverse of the B 1g intensity, finding a divergence point at p = 0.26±0.01, which is close to p sc2 . If this were the case the B 1g Raman response in the superconducting state would not just reflect the maximum gap but rather a superposition of the pair-breaking maximum and a mode related to a symmetry broken at p sc2 .…”

Section: Phase Diagrammentioning

confidence: 99%

See 1 more Smart Citation

Electron interactions and charge ordering in CuO 2 compounds

Muschler

Prestel

Tassini

et al. 2010

Eur. Phys. J. Spec. Top.

Self Cite

View full text Add to dashboard Cite

We present results of inelastic light scattering experiments on singlecrystalline La2−xSrxCuO4 in the doping range 0.00 ≤ x = p ≤ 0.30 and Tl2Ba2CuO 6+δ at p = 0.20 and p = 0.24. The main emphasis is placed on the response of electronic excitations in the antiferromagnetic phase, in the pseudogap range, in the superconducting state, and in the essentially normal metallic state at x ≥ 0.26, where no superconductivity could be observed. In most of the cases we compare B1g and B2g spectra which project out electronic properties close to (π, 0) and (π/2, π/2), respectively. In the channel of electron-hole excitations we find universal behavior in B2g symmetry as long as the material exhibits superconductivity at low temperature. In contrast, there is a strong doping dependence in B1g symmetry: (i) In the doping range 0.20 ≤ p ≤ 0.25 we observe rapid changes of shape and temperature dependence of the spectra. (ii) In La2−xSrxCuO4 new structures appear for x < 0.13 which are superposed on the electron-hole continuum. The temperature dependence as well as model calculations support an interpretation in terms of charge-ordering fluctuations. For x ≤ 0.05 the response from fluctuations disappears at B1g and appears at B2g symmetry in full agreement with the orientation change of stripes found by neutron scattering. While, with a grain of salt, the particle-hole continuum is universal for all cuprates the response from fluctuating charge order in the range 0.05 ≤ p < 0.16 is so far found only in La2−xSrxCuO4. We conclude that La2−xSrxCuO4 is close to static charge order and, for this reason, may have a suppressed Tc.

show abstract

“…In particular special care has been devoted to extract the pure A 1g spectrum from well controlled subtractions of the Raman spectra. Importantly, the doping level was solely controlled by oxygen insertion to avoid cationic substitutions which can drastically change the electronic Raman spectra [46]. The large range of doping levels from p=0.06 to p=0.23 was successfully obtained from specific annealing treatments described in the experimental procedure.…”

Section: Introductionmentioning

confidence: 99%

Three energy scales in the superconducting state of hole-doped cuprates detected by electronic Raman scattering

et al. 2015

View full text Add to dashboard Cite

We explored by electronic Raman scattering the superconducting state of Bi2Sr2CaCu2O 8+δ (Bi-2212) crystal by performing a fine tuned doping study. We found three distinct energy scales in A1g ,B1g and B2g symmetries which show three distinct doping dependencies. Above p=0.22 the three energies merge, below p=0.12, the A1g scale is no more detectable while the B1g and B2g scales become constant in energy. In between, the A1g and B1g scales increase monotonically with underdoping while the B2g one exhibits a maximum at p=0.16. The three superconducting energy scales appear to be an universal feature of hole-doped cuprates. We propose that the non trivial doping dependencies of the three scales originate from the Fermi surface changes and reveal competing orders inside the superconducting dome.

show abstract

Pair breaking versus symmetry breaking: Origin of the Raman modes in superconducting cuprates

Cited by 34 publications

References 133 publications

Superconducting pairing and the pseudogap in the nematic dynamical stripe phase of La_2−xSr_xCuO₄

Superconducting pairing and the pseudogap in the nematic dynamical stripe phase of La_2−xSr_xCuO₄

Electron interactions and charge ordering in CuO 2 compounds

Three energy scales in the superconducting state of hole-doped cuprates detected by electronic Raman scattering

Contact Info

Product

Resources

About

Pair breaking versus symmetry breaking: Origin of the Raman modes in superconducting cuprates

Cited by 34 publications

References 133 publications

Superconducting pairing and the pseudogap in the nematic dynamical stripe phase of La2−xSrxCuO4

Superconducting pairing and the pseudogap in the nematic dynamical stripe phase of La2−xSrxCuO4

Electron interactions and charge ordering in CuO 2 compounds

Three energy scales in the superconducting state of hole-doped cuprates detected by electronic Raman scattering

Contact Info

Product

Resources

About

Superconducting pairing and the pseudogap in the nematic dynamical stripe phase of La_2−xSr_xCuO₄

Superconducting pairing and the pseudogap in the nematic dynamical stripe phase of La_2−xSr_xCuO₄