Pressure-induced transition in a heavy fermion YbPd2Si2 |
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Authors: | Sergey V. Ovsyannikov Vladimir V. Shchennikov |
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Affiliation: | 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 |
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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. |
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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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