Valence fluctuations in Ce2 Rh3+x Ge1-xтезисы доклада

Дата последнего поиска статьи во внешних источниках: 11 апреля 2017 г.

Работа с тезисами доклада

[1] Dariusz K., Yulia F., Alexander G. Valence fluctuations in ce2 rh3+x ge1-x // SCTE 2016 - 20th International Conference on Solid Compounds of Transition Elements, Zaragoza, Spain, 11-15 April 2016. — 2016. — P. 74–74. Ternary intermetallic alloys Ce2Rh3+xGe1-x (0 ≤ x ≤ 0.33) crystallize with a rhombohedral structure of the Mg2Ni3Si-type [derivative of the MgCu2-type Laves phase, space group R-3m (No. 166), Pearson symbol hR18, Z = 3, 6Ce at 6c, 9Rh at 9d, mixture of 3[(1-x)Ge + xRh] (0 ≤x ≤ 0.33) atoms at 3a]. With varying the stoichiometry, the lattice parameters notably change from a = 5.5887(2) Å, c = 11.9557(5) Å (hexagonal setting) for Ce33.3Rh50.0Ge16.7 (x = 0) to a = 5.5127(2) Å, c = 12.2790(5) Å for Ce33.3Rh55.6Ge11.1 (x = 0.33), while the unit cell volume remains nearly same. In the entire homogeneity range,Ce2Rh3+xGe1-x alloys show thermodynamic and electrical transport properties characteristic of intermediate-valent systems with nonmagnetic 4f0 configuration of the electronic ground state of Ce ions. With changing the composition, the energy scale of spin fluctuations diminishes from about 660 K in Ce33.3Rh50.0Ge16.7 to about 540 K in Ce33.3Rh55.6Ge11.1. Both alloys exhibit metallic conductivity and slightly enhanced electronic contribution to the specific heat of about 25 mJ/(mol K2) per Ce atom. JF and AG are grateful to the Russian Foundation for Basic Research for financial support (Grant No. 15-03-06767).

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