Observation of an oxygen isotope effect in superconducting (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Y</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></m

Franck, J. P.; Jung, J.; Mohamed, M.A.-K.; Gygax̊, S.; Sproule, G. I.

doi:10.1103/physrevb.44.5318

Cited by 164 publications

(92 citation statements)

References 33 publications

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“…The oxygen isotope effect of T c has been observed in a number of experiments [71,57,56,72,73]. Here we discuss the results obtained on Pr-doped and oxygen-depleted YBa 2 Cu 3 O 7−δ (YPrBCO and YBCO respectively).…”

Section: Oxygen Isotope Effect In High-t C Materialsmentioning

confidence: 82%

The Isotope Effect in Superconductors

Bill

Kresin

Wolf

1998

Pair Correlations in Many-Fermion Systems

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We review some aspects of the isotope effect (IE) in superconductors. Our focus is on the influence of factors not related to the pairing mechanism. After summarizing the main results obtained for conventional superconductors, we review the effect of magnetic impurities, the proximity effect and non-adiabaticity on the value of the isotope coefficient (IC). We discuss the isotope effect of T c and of the penetration depth δ. The theory is applied to conventional and high-T c superconductors. Experimental results obtained for YBa 2 Cu 3 O 7−δ related materials (Zn and Pr-substituted as well as oxygen-depleted systems) and for La 2−x Sr x CuO 4 are discussed.

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Section: Oxygen Isotope Effect In High-t C Materialsmentioning

confidence: 82%

The Isotope Effect in Superconductors

Bill

Kresin

Wolf

1998

Pair Correlations in Many-Fermion Systems

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“…5,6 The cuprate high-temperature superconductors (HTS) are characterized by a vanishingly small but positive isotope effect exponent in optimally doped compounds which increases in a monotonic way upon decreasing doping. [7][8][9][10][11][12][13][14] For the optimally doped cuprate HTS the smallest value of the oxygen-isotope exponent α O ≃ 0.02 was obtained for YBa 2 Cu 3 O 7−δ and Bi 2 Sr 2 Ca 2 Cu 3 O 10+δ , while it reaches α O ≃ 0.25 for Bi 2 Sr 1.6 La 0.4 CuO 6+δ . [7][8][9]13,14 In addition, it was demonstrated that in underdoped materials α O exceeds substantially the BCS limit α BCS ≡ 0.5.…”

mentioning

confidence: 98%

“…[7][8][9][10][11][12][13][14] For the optimally doped cuprate HTS the smallest value of the oxygen-isotope exponent α O ≃ 0.02 was obtained for YBa 2 Cu 3 O 7−δ and Bi 2 Sr 2 Ca 2 Cu 3 O 10+δ , while it reaches α O ≃ 0.25 for Bi 2 Sr 1.6 La 0.4 CuO 6+δ . [7][8][9]13,14 In addition, it was demonstrated that in underdoped materials α O exceeds substantially the BCS limit α BCS ≡ 0.5. 8,10,14 It is important to note here that the values of both, the oxygen and the copper isotope exponents in cuprate HTS are always positive.…”

mentioning

confidence: 98%

“…[7][8][9]13,14 In addition, it was demonstrated that in underdoped materials α O exceeds substantially the BCS limit α BCS ≡ 0.5. 8,10,14 It is important to note here that the values of both, the oxygen and the copper isotope exponents in cuprate HTS are always positive. Similar tendencies, with the only few above mentioned exceptions, are realized in a case of conventional phonon mediated superconductors.…”

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confidence: 99%

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Intrinsic and structural isotope effects in iron-based superconductors

et al. 2010

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The currently available results of the isotope effect on the superconducting transition temperature Tc in Fe-based high-temperature superconductors (HTSs) are highly controversial. The values of the Fe isotope effect exponent Fe for various families of Fe-based HTS were found to be as well positive, as negative, or even be exceedingly larger than the BCS value BCS 0.5. Here we emphasize that the Fe isotope substitution causes small structural modifications which, in turn, affect Tc. Upon correcting the isotope effect exponent for these structural effects, an almost unique value of 0.35-0.4 is observed for at least three different families of Fe-based HTS.

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“…Since the discovery of superconductivity, the isotopic substitution (α) of atoms and the pressure dependence (γ P ) of transition temperature have been recognised as two key factors [1][2][3][4][5][6] affecting the transition temperature (T C ). The isotope effects in superconductivity were taken as evidence for phonon mediation.…”

Section: Introductionmentioning

confidence: 99%

Studies on Isotope Shift Exponent and Pressure Coefficient for Extended Superconductors within BCS Formalism

Banerjee

Roy

2009

Acta Phys. Pol. A

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A tight-binding model comprising a hopping and an attractive interaction term was considered for high temperature superconductors. Explicit calculations on the effects of isotopic substitution of atoms and application of pressure on the transition temperatures were made in this work. Exact analytical expressions for the isotope-shift exponent (α) and pressure coefficient (γ P ) of transition temperature (T C ) considering the isotopic mass and pressure dependence of the hopping and attractive interaction strengths from a minimal model describing superconductivity were obtained. Theoretical predictions for α and γ P with proper choice of parameters are found to be qualitatively consistent with the results of the experiments of high T C oxides. The results depend on the band dispersion chosen.

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Observation of an oxygen isotope effect in superconducting (Y1−xPr

Cited by 164 publications

References 33 publications

The Isotope Effect in Superconductors

The Isotope Effect in Superconductors

Intrinsic and structural isotope effects in iron-based superconductors

Studies on Isotope Shift Exponent and Pressure Coefficient for Extended Superconductors within BCS Formalism

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