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arXiv 1902.11235cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
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铜氧化物超导体中超导圆顶外的铁磁序

Ferromagnetic order beyond the superconducting dome in a cuprate superconductor

Tarapada Sarkar, D. S. Wei, J. Zhang, N. R. Poniatowski, P. R. Mandal, A. Kapitulnik, Richard L. Greene

摘要:

铜氧化物高温超导体(HTSC)是近30年来人们研究的热点,但其超导机理至今尚未达成一致。传统观点认为,铜酸盐的神秘和非凡的性质来自掺杂强相关反铁磁(AFM)绝缘体(1,2)。高度过掺杂的铜酸盐$-$--那些超出超导性圆顶(SC)的--被认为是传统的费米液体金属(3)。在这里,我们报告的巡游铁磁秩序(FM)的出现低于4K的电子掺杂La $_{2-x} $ Ce $_x$ CuO $_4$(LCCO)的SC圆顶掺杂。该FM阶的存在由负的、非同位素的和滞后的磁阻、滞后磁化和极性克尔效应证明,所有这些都是金属中巡回FM的标准特征(4,5)。这一令人惊讶的新结果表明,过掺杂的铜酸盐也受到电子关联的影响,其物理性质比传统的费米液态金属丰富得多。

英文摘要:

The cuprate high-temperature superconductors (HTSC) have been the subject of intense study for more than 30 years with no consensus yet on the underlying mechanism of the superconductivity. Conventional wisdom dictates that the mysterious and extraordinary properties of the cuprates arise from doping a strongly correlated antiferromagnetic (AFM) insulator (1,2). The highly overdoped cuprates$-$those beyond the dome of superconductivity (SC)--are considered to be conventional Fermi liquid metals (3). Here, we report the emergence of itinerant ferromagnetic order (FM) below 4K for doping beyond the SC dome in electron-doped La$_{2-x} $Ce$_x$CuO$_4$ (LCCO). The existence of this FM order is evidenced by negative, anisotopic and hysteretic magnetoresistance, hysteretic magnetization, and the polar Kerr effect, all of which are standard signatures of itinerant FM in metals (4,5). This surprising new result suggests that the overdoped cuprates are also influenced by electron correlations and the physics is much richer than that of a conventional Fermi liquid metal.

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