Nonsuperconducting electronic ground state in pressurized BaFe2S3 and BaFe2S2.5Se0.5
Nonsuperconducting electronic ground state in pressurized BaFe2S3 and BaFe2S2.5Se0.5
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加压 BaFe2S3 和 BaFe2S2.5Se0.5 中的非超导电子基态
DOI：
10.1103/physrevb.101.205129
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发表时间：
2020
影响因子：
3.7
通讯作者：
Wang Meng
中科院分区：
文献类型：
--
作者：
Sun Hualei;Li Xiaodong;Zhou Yazhou;Yu Jia;Fr;sen Benjamin A.;Wu Shan;Xu Zhijun;Jiang Sheng;Huang Qingzhen;Bourret-Courchesne Edith;Sun Liling;Lynn Jeffrey W.;Birgeneau Robert J.;Wang Meng
本文报道了利用中子衍射、非弹性中子散射、高压同步加速器衍射和高压输运技术对自旋阶梯化合物进行的综合研究。我们发现它具有相同的结构和条纹反铁磁秩序，但与未掺杂的体系相比，其n<s:1>温度K降低了，并且铁的有序矩略有增加。低能自旋激发同样类似于在。然而，与10 GPa或更高的压力下在k以下的超导性的报道不同，我们在19.7 GPa以下的任何压力下都没有观察到超导性。相反，在低温压力下，电阻率呈上升趋势。此外，我们表明，为本研究合成的其他高质量样品同样不能在压力下成为超导，而是在低温下表现出类似的电阻率上升。这些结果表明，微观的、样品特异性的细节在确定自旋阶梯系统的最终电子基态方面起着重要作用。我们认为，这两种材料的低温电阻率上升可能是由S空位和随机Se取代引起的安德森局域化引起的，准一维阶梯结构增强了这种局域化。
We report a comprehensive study of the spin ladder compoundusing neutron diffraction, inelastic neutron scattering, high pressure synchrotron diffraction, and high pressure transport techniques. We find thatpossesses the samestructure and stripe antiferromagnetic order as does, but with a reduced Néel temperature ofK compared to 120 K for the undoped system, and a slightly increased ordered moment ofper iron. The low-energy spin excitations inare likewise similar to those observed in. However, unlike the reports of superconductivity inbelowK under pressures of 10 GPa or more, we observe no superconductivity inat any pressure up to 19.7 GPa. In contrast, the resistivity exhibits an upturn at low temperature under pressure. Furthermore, we show that additional high-quality samples ofsynthesized for this study likewise fail to become superconducting under pressure, instead displaying a similar upturn in resistivity at low temperature. These results demonstrate that microscopic, sample-specific details play an important role in determining the ultimate electronic ground state in this spin ladder system. We suggest that the upturn in resistivity at low temperature in bothandmay result from Anderson localization induced by S vacancies and random Se substitutions, enhanced by the quasi-one-dimensional ladder structure.