Spin fluctuations near the quantum critical point in La2-xSrxCuO4
Quantum critical points (QCP) can be detected through measurement of the specific heat and entropy. It has been proposed that there may be such a QCP at critical doping p* in cuprate superconductors. Below p*, we enter the enigmatic pseudogap phase which corresponds to the onset of new anisotropy in the electronic properties and a loss of low-energy electronic quasiparticles [1,2]. The critical doping, p*, is special not only because it is where the pseudogap phase ends, but because the superconducting phase forms a dome around this point and, the resistivity exhibits an anomalous linear dependence on temperature. Here, we propose to make wavevector-dependent (at T~Tc) measurements of the low-energy magnetic excitations close to p* in La2-xSrxCuO4 to determine whether the magnetic excitations have the anomalous character (i.e. low energy scale) expected at a quantum critical point.
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HAYDEN Stephen M.; BOEHM Martin; A. N. Petsch; STEFFENS Paul and ZHU Mengze. (2020). Spin fluctuations near the quantum critical point in La2-xSrxCuO4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-561
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