Ground-state degeneracy and complex magnetism of geometrically frustrated Gd 2 Ir 0.97 Si 2.97

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2022-12-01
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Chakraborty, Sudip
Gupta, Shuvankar
Pakhira, Santanu
Choudhary, Renu
Biswas, Anis
Mudryk, Yaroslav
Pecharsky, Vitalij K.
Mazumdar, Chandan
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Iowa State University Digital Repository, Ames IA (United States)
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Johnson, Duane
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Materials Science and Engineering

The Department of Materials Science and Engineering teaches the composition, microstructure, and processing of materials as well as their properties, uses, and performance. These fields of research utilize technologies in metals, ceramics, polymers, composites, and electronic materials.

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The Department of Materials Science and Engineering was formed in 1975 from the merger of the Department of Ceramics Engineering and the Department of Metallurgical Engineering.

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1975-present

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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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A new triangular-lattice intermetallic compound Gd2Ir0.97Si2.97 was successfully synthesized as single phase by deliberately introducing vacancies. Theoretical analysis suggests that the ground state is competing with several low-energy spin configurations due to magnetic frustration on a nearly ideal triangular lattice. Despite a number of competing magnetic states, the compound exhibits long-range antiferromagnetic order at 16 K, a long-range ferrimagnetic transition at 6.5 K, and a reentrant cluster-glass transition below Tf ∼ 3 K. The complex magnetism in the compound could be correlated with competing antiferromagnetic and ferrimagnetic structures predicted theoretically.
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This article is published as Chakraborty, Sudip, Shuvankar Gupta, Santanu Pakhira, Renu Choudhary, Anis Biswas, Yaroslav Mudryk, Vitalij K. Pecharsky, Duane D. Johnson, and Chandan Mazumdar. "Ground-state degeneracy and complex magnetism of geometrically frustrated Gd 2 Ir 0.97 Si 2.97." Physical Review B 106, no. 22 (2022): 224427. DOI: 10.1103/PhysRevB.106.224427. Copyright 2022 American Physical Society. Posted with permission. DOE Contract Number(s): AC02-07CH11358
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