High pressure synthesis of a new phase of YbAg₂: Structure, valence of Yb and properties

Journal Article · Wed Aug 05 00:00:00 EDT 2015 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2015.06.203· OSTI ID:1227412

Tsvyashchenko, A. V. ^[1]; Menushenkov, A. P. ^[2]; Sidorov, V. A. ^[1]; Petrova, A. E. ^[1]; Fomicheva, L. N. ^[1]; Chernysheva, O. V. ^[2]; Lebed, Yu. B. ^[3]; Axenov, S. N. ^[4]; Bud’ko, S. L. ^[5]; Sun, Liling ^[6]; Zhao, Zhongxian ^[6]

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1. Russian Academy of Sciences (RAS), Troitsk (Russian)
2. Moscow Engineering Physics Inst., Moscow (Russian)
3. Russian Academy of Sciences (RAS), Moscow (Russian Federation); Moscow Inst. for Physics and Technology (Russian Federation)
4. Russian Academy of Sciences (RAS), Moscow (Russian Federation)
5. Iowa State Univ., Ames, IA (United States)
6. Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)

The new phase of YbAg₂ was obtained using high-pressure and high-temperature reaction. YbAg₂ crystallizes in the MgZn₂ structure (the space group P6₃/mmc space group, No 194) with a = 5.68153(3) Å and c = 9.31995(7) Å and the unit cell volume V = 260.54(3) ų. The XANES analysis showed that the valence state of Yb is +2.8. The low-temperature dependences of the electrical resistivity and magnetic susceptibility can be adequately described by a T² term that supports the Fermi-liquid picture. Furthermore, the Kadowaki–Woods relation gives a low value of the degeneracy (N = 2).

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: 14-02-00001; 14-22-01002-ofi_m; RSF-14-22-00093; 91321207; 11427805; DE-AC02-07CH11358; AC02-07CH11358
• OSTI ID: 1227412
• Alternate ID(s): OSTI ID: 1250204
• Report Number(s): IS-J-8820; PII: S0925838815303236
• Journal Information: Journal of Alloys and Compounds, Vol. 650, Issue C; ISSN 0925-8388
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
high-pressure reaction
new phase
valence state
fermi-liquid
kadowaki-woods relation