在 EuFe2(As 1-x P x)2 超导态中发现多种磁序

IF 2.8 2区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Nan Zhou, Yue Sun, Ivan S Veshchunov, S Kittaka, X L Shen, H M Ma, W Wei, Y Q Pan, M Cheng, Y F Zhang, Y Kono, Yuping Sun, T Tamegai, Xuan Luo, Zhixiang Shi, Toshiro Sakakibara
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引用次数: 0

摘要

超导性与磁性之间的相互作用是凝聚态物理学的一个重要课题。基于 EuFe2As2 的铁锑化物为研究它们之间的关系提供了一个有趣的平台,引起了广泛关注。迄今为止,人们在 EuFe2As2 基晶体中观察到了两种磁性相变,认为它们分别源于流动铁矩(~190 K)和局部 Eu2+ 矩(~19 K)。在这里,我们系统地研究了 x = 0.21(最佳掺杂)和 x = 0.29(过度掺杂)的 EuFe2(As1-xPx)2 晶体的热容量。我们在最佳掺杂晶体的超导态(0.4 至 1.2 K)中发现了两个新的磁阶。随着更多的 P 被引入 As 位点,其中一个磁序在过掺杂晶体中变得不存在。此外,我们还观察到热容量具有很强的磁场和取向依赖性。目前在 EuFe2(As1-xPx)2 中的发现检测到了新的低温磁序,这可能源于局部 Eu2+ 自旋序或自旋重新定向。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multiple magnetic orders discovered in the superconducting state of EuFe2(As 1−x P x)2
The interplay between superconductivity and magnetism is an important subject in condensed matter physics. EuFe2As2-based iron pnictides could offer an interesting plateau to study their relationship that has attracted considerable attention. So far, two magnetic phase transitions were observed in EuFe2As2-based crystal, which were deemed to originate from the itinerant Fe moments (~190 K) and the localized Eu2+ moments (~19 K), respectively. Here, we systematically studied the heat capacity for the EuFe2(As 1xPx)2 crystals with x = 0.21 (optimally doped) and x = 0.29 (overdoped). We have found two new magnetic orders in the superconducting state (ranging from 0.4 to 1.2 K) in the optimally doped crystal. As more P was introduced into the As site, one of the magnetic orders becomes absent in the overdoped crystal. Additionally, we observed strong field and orientation dependence in heat capacity. The present findings in EuFe2(As 1xPx)2 have detected the new low-temperature magnetic orders, which may originate from the localized Eu2+ spins order or the spin reorientation.
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来源期刊
New Journal of Physics
New Journal of Physics 物理-物理:综合
CiteScore
6.20
自引率
3.00%
发文量
504
审稿时长
3.1 months
期刊介绍: New Journal of Physics publishes across the whole of physics, encompassing pure, applied, theoretical and experimental research, as well as interdisciplinary topics where physics forms the central theme. All content is permanently free to read and the journal is funded by an article publication charge.
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