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Pressure-induced transition in a heavy fermion YbPd2Si2 |
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| Authors: | Sergey V Ovsyannikov Vladimir V Shchennikov |
| Institution: | a The Institute of Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, 277-8581 Chiba, Japan b High Pressure Group, Institute of Metal Physics of Russian Academy of Sciences, Urals Division, GSP-170, 18 S. Kovalevskaya Street, 620041 Yekaterinburg, Russian Federation c Faculty of Sciences, Yamaguchi University, 753-8512 Yamaguchi, Japan |
| Abstract: | We report the results of a room-temperature investigation of the thermoelectric and the dilatometric properties of a heavy fermion system YbPd2Si2 (itterbium-palladium-silicon, 1-2-2) at high pressure P up to 22 GPa; YbPd2Si2 is a less-studied representative of the RM2X2 family (R=Ce, Yb, U; M=transition metal; X=Si, Ge) with the tetragonal ThCr2Si2-type structure of the I4/mmm space group. Around P∼6±0.5 GPa, a phase transition in Yb-Pd-Si was registered by the drastic changes in the pressure dependencies of the electrical resistance R, the thermopower (Seebeck effect) S, a temperature difference along a sample ΔT, and a sample's thickness Δx (related to compressibility). Both a nature of the found phase transition and a presumable P-T phase diagram of YbPd2Si2 are discussed. |
| Keywords: | 72 20 Pa 05 70 Fh 52 77 Fv 81 70 -q 73 61 Ey 71 22 +i 61 50 Ks 81 40 Vw |
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