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arXiv 2605.00540cond-mat.str-el
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非协调磁有序相在SmAu$_3$Al$_7$中低温磁比热增强

Incommensurate Magnetic Ordered Phase with Enhanced Low-Temperature Magnetic Specific Heat in SmAu$_3$Al$_7$

Tokyo Metropolitan University(东京都立大学);Japan Atomic Energy Agency(日本原子能机构);Comprehensive Research Organization for Science and Society(综合科学研究组织);Institute of Materials Structure Science, High-Energy Accelerator Research Organization(高能加速器研究机构物质结构科学研究所);Institute of Science Tokyo(东京科学大学)
Ryuji Higashinaka, Takuma Iwami, Kohsuke Saitou, Takashi U. Ito, Chihiro Tabata, Koji Kaneko, Takashi Ohhara, Ryoji Kiyanagi, Akiko Nakao, Jumpei G. Nakamura, W… 展开作者

Ryuji Higashinaka, Takuma Iwami, Kohsuke Saitou, Takashi U. Ito, Chihiro Tabata, Koji Kaneko, Takashi Ohhara, Ryoji Kiyanagi, Akiko Nakao, Jumpei G. Nakamura, Wataru Higemoto, Akihiro Koda, Shinsaku Kambe, Yuji Aoki, Tatsuma D. Matsuda

AI总结:

研究通过中子散射和μ子自旋旋转测量揭示SmAu$_3$Al$_7$中非协调磁有序相,其在2.8K和0.9K处的相变与低温磁比热增强有关。

摘要:

对单晶SmAu$_3$Al$_7$的中子散射和μ子自旋旋转(μSR)测量揭示了与相继相变相关的磁有序态,分别发生在T_N=2.8K和T*=0.9K。在T_N以下,磁布拉格峰出现,具有非协调的传播向量q=(0.30, 0, 1.33)。μSR检测到T_N以下的自发内部场,其谱形与非协调磁有序一致。在T*处未观察到异常,表明磁结构在T*上下基本不变。磁有序被证实为空间均匀的长程有序态,而非先前研究中提出的部分无序态。讨论了非协调磁有序与低温磁比热增强的可能联系。

英文摘要:

Neutron scattering and muon spin rotation ($μ$SR) measurements on single-crystal SmAu$_3$Al$_7$ reveal magnetically ordered states associated with successive transitions at $T_{\rm N}$ = 2.8 K and $T^*$ = 0.9 K. Magnetic Bragg peaks appear below $T_{\rm N}$ with an incommensurate (IC) propagation vector ${\bf q}$ = (0.30, 0, 1.33). $μ$SR detects spontaneous internal fields below $T_{\rm N}$, and the spectral shape is consistent with the IC magnetic ordering. No anomalies are observed at $T^*$, indicating that the magnetic structure remains essentially unchanged below and above $T^*$. The magnetic order is revealed to be a spatially homogeneous long-range ordered state, rather than a partially disordered state proposed in earlier studies. The possible connection between the IC magnetic order and the enhanced low-temperature magnetic specific heat is discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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