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Incoherent strange metal sharply bounded by a critical doping in Bi2212

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Science  29 Nov 2019:
Vol. 366, Issue 6469, pp. 1099-1102
DOI: 10.1126/science.aaw8850

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A sharp boundary in the cuprates

Many physicists working on cuprate superconductors believe that the so-called strange metal phase in the cuprate phase diagram is associated with a quantum critical point. Within this picture, the quantum critical point gives rise to a V-shaped region in the doping-temperature phase diagram of the cuprates: the strange metal phase. Chen et al. used angle-resolved photoemission spectroscopy in the cuprate family Bi2212 to challenge this view. By taking comprehensive measurements as a function of doping and temperature—and making sure that the signal was not affected by environmental conditions—they found an incoherent strange metal phase that was sharply separated from a conventional phase by a temperature-independent vertical line in the phase diagram.

Science, this issue p. 1099

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