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Inverse correlation between quasiparticle mass and Tc in a cuprate high-Tc superconductor

Science advances

American Association for the Advancement of Science

high pressure, quantum oscillations, cuprate superconductors

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      Abstract

      Contrary to what is expected near a quantum critical point, pressure decreases the quasiparticle mass of a high-T c superconductor.

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      Most cited references 46

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      Incipient charge order observed by NMR in the normal state of YBa2Cu3Oy

      The pseudogap regime of high-temperature cuprates harbours diverse manifestations of electronic ordering whose exact nature and universality remain debated. Here, we show that the short-ranged charge order recently reported in the normal state of YBa2Cu3Oy corresponds to a truly static modulation of the charge density. We also show that this modulation impacts on most electronic properties, that it appears jointly with intra-unit-cell nematic, but not magnetic, order, and that it exhibits differences with the charge density wave observed at lower temperatures in high magnetic fields. These observations prove mostly universal, they place new constraints on the origin of the charge density wave and they reveal that the charge modulation is pinned by native defects. Similarities with results in layered metals such as NbSe2, in which defects nucleate halos of incipient charge density wave at temperatures above the ordering transition, raise the possibility that order–parameter fluctuations, but no static order, would be observed in the normal state of most cuprates if disorder were absent.
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        Long-range incommensurate charge fluctuations in (Y,Nd)Ba2Cu3O(6+x).

        The concept that superconductivity competes with other orders in cuprate superconductors has become increasingly apparent, but obtaining direct evidence with bulk-sensitive probes is challenging. We have used resonant soft x-ray scattering to identify two-dimensional charge fluctuations with an incommensurate periodicity of ~3.2 lattice units in the copper-oxide planes of the superconductors (Y,Nd)Ba(2)Cu(3)O(6+)(x), with hole concentrations of 0.09 to 0.13 per planar Cu ion. The intensity and correlation length of the fluctuation signal increase strongly upon cooling down to the superconducting transition temperature (T(c)); further cooling below T(c) abruptly reverses the divergence of the charge correlations. In combination with earlier observations of a large gap in the spin excitation spectrum, these data indicate an incipient charge density wave instability that competes with superconductivity.
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          Quantum oscillations and the Fermi surface in an underdoped high-Tc superconductor

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            Author and article information

            Journal
            10.1126/sciadv.1501657
            27034989
            4803492

            http://creativecommons.org/licenses/by-nc/4.0/

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