Pseudogap of the high-temperature superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mrow><mml:mn>1.96</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Ho</mml:mi><mml:mn>0.04</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">

Häfliger, P. S.; Podlesnyak, A.; Conder, K.; Pomjakushina, E.; Fürrer, A.

doi:10.1103/physrevb.74.184520

Cited by 19 publications

(29 citation statements)

References 71 publications

(86 reference statements)

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“…A purely phononic pairing mechanism will give a very characteristic dependence of superconducting properties on the mass of the participating ions [10]. In cuprates, where the contributions to the pairing mechanism have not been quantified, isotope effects on the electronic properties are well known but complex: while the pseudogap temperature rises [11] with 18 O isotope substitution, the superconducting transition temperature decreases [12]. In contrast, only little is known regarding isotope effects on magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Quantum and thermal ionic motion, oxygen isotope effect, and superexchange distribution inLa2CuO4

et al. 2014

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We study the zero-point and thermal ionic motion in La 2 CuO 4 by means of high-resolution neutron-diffraction experiments. Our results demonstrate anisotropic motion of O and, to a lesser extent, Cu ions, both consistent with the structure of coupled CuO 6 octahedra, and quantify the relative effects of zero-point and thermal contributions to ionic motion. By substitution of 18 O, we find that the oxygen isotope effect on the lattice dimensions is small and negative (−0.01%), while the isotope effect on the ionic displacement parameters is significant (−6 to 50%). We use our results as input for theoretical estimates of the distribution of magnetic interaction parameters, J , in an effective one-band model for the cuprate plane. We find that ionic motion causes only small (1%) effects on the average value J , which vary with temperature and O isotope, but results in dramatic (10-20%) fluctuations in J values that are subject to significant (8-12%) isotope effects. We demonstrate that this motional broadening of J can have substantial effects on certain electronic and magnetic properties in cuprates.

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Section: Introductionmentioning

confidence: 99%

Quantum and thermal ionic motion, oxygen isotope effect, and superexchange distribution inLa2CuO4

et al. 2014

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“…The values of the pseudogap temperature T * as well as the corresponding values of T c as measured for all 16 are summarized in Fig. 4a and Table I 19 ) are also displayed in Fig. 4a.…”

Section: Resultsmentioning

confidence: 97%

Evidence for strong lattice effects as revealed from huge unconventional oxygen isotope effects on the pseudogap temperature in La2−xSrxCuO4

et al. 2017

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The oxygen isotope ( 16 O/ 18 O) effect (OIE) on the pseudogap (charge-stripe ordering) temperature T * is investigated for the cuprate superconductor La2−xSrxCuO4 as a function of doping x by means of x-ray absorption near edge structure (XANES) studies. A strong x dependent and sign reversed OIE on T * is observed. The OIE exponent αT * systematically decreases from αT * = −0.6(1.3) for x = 0.15 to αT * = −4.4(1.1) for x = 0.06, corresponding to increasing T * and decreasing superconducting transition temperature Tc. Both T * ( 16 O) and T * ( 18 O) exhibit a linear doping dependence with different slopes and critical end points (where T * ( 16 O) and T * ( 18 O) fall to zero) at xc( 16 O) = 0.201(4) and xc( 18 O) = 0.182(3), indicating a large positive OIE of xc with an exponent of αx c = 0.84 (22). The remarkably large and strongly doping dependent OIE on T * signals a substantial involvement of the lattice in the formation of the pseudogap, consistent with a polaronic approach to cuprate superconductivity and the vibronic character of its ground state.

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“…1.96-x Sr x Ho 0.04 CuO 4[29,30]. We found oxygen isotope coefficients α*(O)=-2.0, -1.3, -0.7, and -0.3 for x=0.11, 0.15, 0.20, and 0.25, respectively, but the copper isotope coefficient α*(Cu) turned out to be zero within experimental error.…”

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confidence: 87%

The Barocaloric Effect: A Spin-off of the Discovery of High-Temperature Superconductivity

Fürrer¹

2017

High-Tc Copper Oxide Superconductors and Related Novel Materials

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Pseudogap of the high-temperature superconductorLa1.96−xSrxHo0.04Cu

Cited by 19 publications

References 71 publications

Quantum and thermal ionic motion, oxygen isotope effect, and superexchange distribution inLa2CuO4

Quantum and thermal ionic motion, oxygen isotope effect, and superexchange distribution inLa2CuO4

Evidence for strong lattice effects as revealed from huge unconventional oxygen isotope effects on the pseudogap temperature in La2−xSrxCuO4

The Barocaloric Effect: A Spin-off of the Discovery of High-Temperature Superconductivity

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