Resistance data under pulsed magnetic fields reveal doping-dependent CDW-superconductivity competition in La2-xSrxCuO4, with two resilient superconducting domes and a special zero-field balance at x=1/8.
Formation of Incommensurate Charge Density Waves in Cuprates
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abstract
Although charge density waves (CDWs) are omnipresent in cuprate high-temperature superconductors, they occur at significantly different wavevectors, confounding efforts to understand their formation mechanism. Here, we use resonant inelastic x-ray scattering to investigate the doping- and temperature-dependent CDW evolution in La2-xBaxCuO4 (x=0.115-0.155). We discovered that the CDW develops in two stages with decreasing temperature. A precursor CDW with quasi-commensurate wavevector emerges first at high-temperature. This doping-independent precursor CDW correlation originates from the CDW phase mode coupled with a phonon and "seeds" the low-temperature CDW with strongly doping dependent wavevector. Our observation reveals the precursor CDW and its phase mode as the building blocks of the highly intertwined electronic ground state in the cuprates.
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cond-mat.supr-con 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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Doping-dependent competition between superconductivity and polycrystalline charge density waves
Resistance data under pulsed magnetic fields reveal doping-dependent CDW-superconductivity competition in La2-xSrxCuO4, with two resilient superconducting domes and a special zero-field balance at x=1/8.