标题： 重费米子超导体CeRh2As2中的竞争电子基态 显示英文标题

标题： Competing electronic ground states in the heavy-fermion superconductor CeRh2As2

摘要： CeRh2As2在超导体中是罕见的，因为在磁场作用下它可以在两种不同的超导相之间转换。 结合缺乏局部反演对称性和上临界磁场超过Pauli顺磁极限，这令人兴奋地表明存在三重态多组分超conductivity。 在超导开始之前，f电子关联导致长程有序，这既归因于局部反铁磁性，也归因于巡游（四极）密度波。 磁场对f电子产生显著扰动，并可能揭示多体关联的性质。 因此，我们报告了在高达73 T的磁场下对微结构器件的全面磁化和磁电输运研究。沿c轴施加的磁场在低温下引起价态转变，{\mu }0H ~ 24 T。相比之下，面内磁场产生一系列相变；面内电流密度各向异性的磁场诱导和缺乏伴随的磁特征，加上整体相边界闭合的特性，与磁场诱导的密度波状态的层次结构一致。 显示英文摘要

摘要： CeRh2As2 is rare among superconductors, in that magnetic field tunes it between two distinct superconducting phases. Combined with a lack of local inversion symmetry and an upper critical field exceeding the Pauli paramagnetic limit, this excitingly suggests triplet multicomponent superconductivity. Preceding the superconducting onset, f-electron correlations cause long-range order, attributed both to local antiferromagnetism and itinerant (quadrupole) density-waves. Magnetic field provides a significant perturbation of the f-electron and may reveal the nature of the many-body correlations. Thus, we report comprehensive magnetization and magnetotransport studies on microstructured devices in fields of up to 73 T. Applied along the c-axis, field causes a low-temperature valence transition at {\mu}0H ~ 24 T. By contrast, in-plane fields produce a cascade of phase transitions; the field-induced in-plane conductivity anisotropy and lack of accompanying magnetic features, plus the closed-dome nature of the overall phase boundary is consistent with a hierarchy of field-induced density-wave states.