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Charge-Density-Wave Order and Multiple Magnetic Transitions in Divalent Europium Compound EuAl₄
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Description
Multiple transition phenomena in divalent Eu compound EuAl$_4$ with the tetragonal structure were investigated via the single-crystal time-of-flight neutron Laue technique. At 30.0 K below a charge-density-wave (CDW) transition temperature of $T_{\rm CDW}$ = 140 K, superlattice peaks emerge near nuclear Bragg peaks described by an ordering vector $q_{\rm CDW}$=(0 0 $��_c$) with $��_c{\sim}$0.19. In contrast, magnetic peaks appear at $q_2 = (��_2 ��_2 0)$ with $��_2$ = 0.085 in a magnetic-ordered phase at 13.5 K below $T_{\rm N1}$ = 15.4 K. By further cooling to below $T_{\rm N3}$ = 12.2 K, the magnetic ordering vector changes into $q_1 = (��_1 0 0)$ with $��_1$ = 0.17 at 11.5 K and slightly shifts to $��_1$ = 0.194 at 4.3 K. No distinct change in the magnetic Bragg peak was detected at $T_{\rm N2}$=13.2 K and $T_{\rm N4}$=10.0 K. The structural modulation below $T_{\rm CDW}$ with $q_{\rm CDW}$ is characterized by the absence of the superlattice peak in the (0 0 $l$) axis. As a similar CDW transition was observed in SrAl$_4$, the structural modulation with $q_{\rm CDW}$ could be mainly ascribed to the displacement of Al ions within the tetragonal $ab$-plane. Complex magnetic transitions are in stark contrast to a simple collinear magnetic structure in isovalent EuGa$_4$. This could stem from different electronic structures with the CDW transition between two compounds.
6 pages, 3 figures, accepted for publication in J. Phys. Soc. Jpn
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 90 (6), 064704-, 2021-06
Tokyo : Physical Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1520573331201647232
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- NII Article ID
- 40022591342
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- NII Book ID
- AA00704814
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- ISSN
- 00319015
- 13474073
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- NDL BIB ID
- 031503275
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- Text Lang
- en
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- Article Type
- journal article
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- NDL Source Classification
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- ZM35(科学技術--物理学)
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- Data Source
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- NDL Search
- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE