We report on the first observation of the de Haas–van Alphen (dHvA) effect in CrAs under hydrostatic pressures of up to 2.2 GPa, exceeding the critical pressure P_c ∼ 0.7 GPa, where the antiferromagnetic (helimagnetic) state is suppressed and the unconventional superconductivity emerges. The small Fermi surface (FS) with the dHvA frequency F of 220 T and the cyclotron effective mass \(m_{\text{c}}^{*}\) of 0.9 m₀ (m₀: rest mass of an electron) at ambient pressure disappears above P_c; instead, larger FSs with F of up to 3480 T with relatively heavy \(m_{\text{c}}^{*}\) of up to 7.6 m₀ were observed.

中文翻译：

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压力诱导的超导体CrAs中的de Haas–van Alphen效应

我们对在下向上的静水压力的CRA去哈斯面包车尔芬（DHVA）效应第一观察到2.2 GPA报告，超过临界压力P _{c ^}〜0.7 GPA，其中反铁磁性（helimagnetic）状态被抑制，非常规超导出现了。dHvA频率F为220 T的小费米表面（FS），回旋加速器有效质量\（m _ {\ text {c}} ^ {*} \）在环境压力下，0.9 m ₀（m ₀：电子的剩余质量）的P值在P _c以上消失。相反，F高达3480 T的较大FS相对较重\（m _ {\ text {c}} ^ {*} \）观察到高达7.6 m ₀。