Search for Isotope Effect in Superconducting Y-Ba-Cu-O

Bourne, L. C.; Crommie, Michael F.; Zettl, A.; Loye, Hans-Conrad zur; Keller, Steven W.; Leary, K. L.; Stacy, Angelica M.; Chang, Kee-Joo; Cohen, Marvin L.; Morris, Donald E.

doi:10.1103/physrevlett.58.2337

Cited by 294 publications

(37 citation statements)

References 16 publications

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“…Moreover, the analysis of the isotope effect is still a very active field in more complex superconductors such as cuprates and Fe-based high-temperature superconductors, since the role of lattice vibrations in their coupling mechanism is yet to be fully understood. [2][3][4][5][6][7][8][9] The value given by BCS theory for the isotope coefficient is a BCS ¼ 0:5. In simple metals and alloys, a ranges typically between 0.2 and 0.5 in reasonable agreement with the theory.…”

Section: Introductionmentioning

confidence: 99%

Isotope effect in the superconducting high-pressure simple cubic phase of calcium from first principles

Errea

Rousseau

Bergara

2012

Journal of Applied Physics

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Articles you may be interested inAb initio studies on phase transition, thermoelastic, superconducting and thermodynamic properties of the compressed cubic phase of AlH3 J. Appl. Phys. 115, 124904 (2014) (2011)] that the phonons of the high-pressure simple cubic phase of calcium are stabilized by strong quantum anharmonic effects. This was obtained by a fully ab initio implementation of the self-consistent harmonic approximation including explicitly anharmonic coefficients up to fourth order. The renormalized anharmonic phonons make possible to estimate the superconducting transition temperature in this system, and a sharp agreement with experiments is found. In this work, this analysis is extended in order to study the effect of anharmonicity in the isotope effect. According to our calculations, despite the huge anharmonicity in the system, the isotope coefficient is predicted to be 0.45, close to the 0.5 value expected for a harmonic BCS superconductor. V C 2012 American Institute of Physics.[http://dx

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Section: Introductionmentioning

confidence: 99%

Isotope effect in the superconducting high-pressure simple cubic phase of calcium from first principles

Errea

Rousseau

Bergara

2012

Journal of Applied Physics

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“…Due to the high values of the superconducting transition temperature T c and the early observation of a tiny oxygen-isotope effect in optimally doped YBa 2 Cu 3 O 7−δ [2,3,4], many theoreticians came to the conclusion that the electronphonon interaction cannot be responsible for high-temperature superconductivity. As a result, alternative pairing mechanisms of purely electronic origin were proposed.…”

Section: Introductionmentioning

confidence: 99%

The oxygen isotope effect on the in-plane penetration depth in cuprate superconductors

Khasanov¹,

Shengelaya²,

Morenzoni³

et al. 2004

J. Phys.: Condens. Matter

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Abstract. Muon-spin rotation (µSR) studies of the oxygen isotope (16 O/ 18 O) effect (OIE) on the in-plane magnetic field penetration depth λ ab in cuprate high-temperature superconductors (HTS) are presented. First, the doping dependence of the OIE on the transition temperature T c in various HTS is briefly discussed. It is observed that different cuprate families show a similar doping dependence of the OIE on T c . Then, bulk µSR, low-energy µSR, and magnetization studies of the total and site-selective OIE on λ ab are described in some detail. A substantial OIE on λ ab was observed in various cuprate families at all doping levels, suggesting that cuprate HTS are nonadiabatic superconductors. The experiments clearly demonstrate that the total OIE on T c and λ ab arise from the oxygen sites within the superconducting CuO 2 planes, demonstrating that the phonon modes involving the movement of planar oxygen are dominantly coupled to the supercarriers. Finally, it is shown that the OIE on T c and λ ab exhibit a relation that appears to be generic for different families of cuprate HTS. The observation of these unusual isotope effects implies that lattice effects play an essential role in cuprate HTS and have to be considered in any realistic model of high-temperature superconductivity.

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“…More than ten years after the discovery of the high-T c cuprate superconductors by Bednorz and Müller [1], there have been no microscopic theories that can describe the physics of high-T c superconductors completely and unambiguously. Due to the high T c values and the earlier observation of a small oxygen-isotope effect in a 90 K cuprate superconductor YBa 2 Cu 3 O 7−y [2][3][4], many theorists believe that the electron-phonon interaction cannot be the origin of high-T c superconductivity. Most physicists have thus turned their minds towards an alternative pairing interaction of purely electronic origin (e.g., see Ref.…”

Section: Introductionmentioning

confidence: 99%

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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Search for Isotope Effect in Superconducting Y-Ba-Cu-O

Cited by 294 publications

References 16 publications

Isotope effect in the superconducting high-pressure simple cubic phase of calcium from first principles

Isotope effect in the superconducting high-pressure simple cubic phase of calcium from first principles

The oxygen isotope effect on the in-plane penetration depth in cuprate superconductors

Unconventional isotope effects in the high-temperature cuprate superconductors

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