Incommensurate Magnetic Ordered Phase with Enhanced Low-Temperature Magnetic Specific Heat in SmAu <sub>3</sub> Al <sub>7</sub>
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.
Authors
- Tatsuma D. Matsuda (ORCID: https://orcid.org/0000-0003-3805-5165)
- Jumpei Nakamura (ORCID: https://orcid.org/0000-0002-8381-5074)
- Wataru Higemoto (ORCID: https://orcid.org/0000-0001-6988-4340)
- Ryoji Kiyanagi (ORCID: https://orcid.org/0000-0002-8636-1258)
- S. Kambe (ORCID: https://orcid.org/0000-0001-9860-1469)
- Koji Kaneko (ORCID: https://orcid.org/0000-0002-2002-0610)
- T. Ito (ORCID: https://orcid.org/0000-0003-1971-4313)
- Chihiro Tabata (ORCID: https://orcid.org/0000-0001-5935-2850)
- Takashi Ohhara (ORCID: https://orcid.org/0000-0002-1215-6032)
- Takuma IWAMI
- Akiko Nakao
- Yuji Aoki (ORCID: https://orcid.org/0000-0002-0957-3396)
- Ryuji Higashinaka (ORCID: https://orcid.org/0000-0002-7961-6267)
- Kohsuke Saitou
- Akihiro Koda (ORCID: https://orcid.org/0000-0002-4453-4472)
Institutions
- Japan Atomic Energy Agency (JP)
- High Energy Accelerator Research Organization (JP)
- Japan Proton Accelerator Research Complex (JP)
- Comprehensive Research Organization for Science and Society (JP)
- Advanced Science Research Center (JP)
- Institute of Science Tokyo (JP)
- Tokyo Metropolitan University (JP)
Publication Details
- Journal
- Journal of the Physical Society of Japan
- Published
- 2026-05-01
- DOI
- https://doi.org/10.7566/jpsj.95.063702
- Primary Topic
- Rare-earth and actinide compounds
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Tokyo Metropolitan Government
- Ministry of Education, Culture, Sports, Science and Technology
- Japan Society for the Promotion of Science
- Japan Atomic Energy Agency