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Temprano, D. Rubio; Mesot, J.; Janssen, Stefan; Conder, K.; Fürrer, A.; Mutka, H.; Müller, K. A.

doi:10.1103/physrevlett.84.1990

Cited by 190 publications

(140 citation statements)

References 21 publications

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“…This mean-field scheme treats the local dynamical atomic displacements as correlated to the local density fluctuations between the electrons and the bipolarons, which in our model, are responsible for the opening of the pseudogap. It is this mecha-nism which is at the origin of the blockage of the crystal field excitations which below T * couple to the free charge carriers, as observed experimentally in neutron spectroscopic measurements testing the transitions between different crystal field levels 8,9 . A more quantitative analysis than the mean-field procedure presented here would be required in order to account for the dynamical nature of the onset of pairing, as seen in experiments with different time scales 17 which lead to different absolute values of T * but to qualitatively similar doping dependence of T * .…”

Section: Discussionmentioning

confidence: 99%

Resonant pairing isotope effect in polaronic systems

Ranninger

Romano²

2005

Phys. Rev. B

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The intermediate coupling regime in polaronic systems, situated between the adiabatic and the anti-adiabatic limit, is characterized by resonant pairing between quasi-free electrons which is induced by an exchange interaction with localized bipolarons. The onset of this resonant pairing takes place below a characteristic temperature T * and is manifest in the opening of a pseudogap in the density of states of the electrons. The variation of T * is examined here as a function of (i) the typical frequency ω0 of the local lattice modes, which determines the binding energy of the bipolarons, and (ii) the total concentration of charge carriers ntot = nF + nB, where nF and nB are the densities of free electrons and bipolarons, respectively. The variation of either of these quantities induces similar changes of the value of nB with respect to that of nF , in this way leading to a shift of T * . For finite, but small values of nB (≤ 0.1 per site), we find negative and practically doping independent values of the corresponding isotope coefficient α * . Upon decreasing ntot such that nB becomes exponentially small, we find a rapid change in sign of α * . This is related to the fact that the system approaches a state which is more BCS-like, where electron pairing occurs via virtual excitations into bipolaronic states and where T * coincides with the onset of superconductivity.

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Section: Discussionmentioning

confidence: 99%

Resonant pairing isotope effect in polaronic systems

Ranninger

Romano²

2005

Phys. Rev. B

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“…Similarly, a large copper-isotope effect on T p has been found in the same compound [53]. The huge oxygen-isotope effects on T * [50] and on T p [52] indicate that a strong electron-phonon interaction plays an essential role in the charge dynamics and superconductivity [48]. Although the authors of Ref.…”

Section: Huge Oxygen-isotope Effect On the Charge Stripe Formationmentioning

confidence: 98%

“…From the figure, one can clearly see that, upon replacing 16 O with 18 O, the chargestripe formation temperature T * in this cuprate increases from about 110 K to 180 K. Such a large negative isotope effect on charge ordering can be explained in terms of electron-phonon coupling beyond the Migdal approximation [51]. Recently, a neutron spectroscopic investigation of the isotope effect on the relaxation rate of crystal field excitations of Ho 3+ in HoBa 2 Cu 4 O 8 has been carried out [52]. In Fig.…”

Section: Huge Oxygen-isotope Effect On the Charge Stripe Formationmentioning

confidence: 99%

“…Although the authors of Ref. [52] attributed the characterisitc temperature T p to a pseudogap formation temperature, one cannot rule out the possibility that T p may be related to a dynamical charge ordering. We would like to mention that a small positive oxygen-isotope effect on the spin pseudogap has been observed in YBa 2 Cu 4 O 8 [54].…”

Section: Huge Oxygen-isotope Effect On the Charge Stripe Formationmentioning

confidence: 99%

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Unconventional isotope effects in the high-temperature cuprate superconductors

Zhao

Keller

Conder

2001

J. Phys.: Condens. Matter

139

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We review various isotope effects in the high-Tc cuprate superconductors to assess the role of the electron-phonon interaction in the basic physics of these materials. Of particular interest are the unconventional isotope effects on the supercarrier mass, on the charge-stripe formation temperature, on the pseudogap formation temperature, on the EPR linewidth, on the spin-glass freezing temperature, and on the antiferromagnetic ordering temperature. The observed unconventional isotope effects strongly suggest that lattice vibrations play an important role in the microscopic pairing mechanism of high-temperature superconductivity.

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“…An even greater puzzle than the isotope effect on T c is the recently discovered one on T* [20][21][22]. Here the isotope effect is giant -one of the largest ever observed in solid state systems -and has most interestingly the reversed sign, i.e.…”

Section: Figure 51 the Doping Dependent Phase Diagram Of Htscmentioning

confidence: 99%

Multicomponent superconductivity: the complex interplay of spin charge and lattice

Bussmann‐Holder

2006

Philosophical Magazine

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Large Isotope Effect on the Pseudogap in the High-Temperature SuperconductorHoBa2Cu4O8

Cited by 190 publications

References 21 publications

Resonant pairing isotope effect in polaronic systems

Resonant pairing isotope effect in polaronic systems

Unconventional isotope effects in the high-temperature cuprate superconductors

Multicomponent superconductivity: the complex interplay of spin charge and lattice

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