We study the transport properties of underdoped trilayer cuprate HgBa₂Ca₂Cu₃O_8+δ with doping level p = 0.10–0.12 in magnetic field up to 88 T. We report for the first time in a cuprate superconductor a dramatic change of the quantum oscillation spectrum versus temperature, which is accompanied by a sign change of the Hall effect below T ≈10 K. Based on numerical simulations, we infer a Fermi surface reconstruction in the inner plane from an antiferromagnetic state (hole pockets) to a biaxial charge density wave state (electron pockets). We show that both orders compete and share the same hotspots of the Fermi surface, and we discuss our result in the context of spin-fermion models.

我们研究了掺杂不足的三层铜酸盐 HgBa₂Ca₂Cu₃O_8+δ 在高达 88 T 的磁场中掺杂水平 p = 0.10–0.12 的传输特性。我们首次在铜酸盐超导体中报告了量子振荡光谱随温度的巨大变化，并伴随着霍尔效应在 T ≈10 K 以下的符号变化。基于数值模拟，我们推断了内平面中的费米表面重建从反铁磁状态（空穴）到双轴电荷密度波态（电子袋）。我们证明了这两个阶层竞争并共享费米表面的相同热点，并在自旋费米子模型的背景下讨论了我们的结果。