1. Thermodynamic and Transport Properties of CeMg2Cu9under Pressure
- Author
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Koji Asada, Hironobu Fujii, J. Hori, Toshizo Fujita, Y. Nakamori, Fumihiko Nakamura, Masakazu Ito, and Takashi Suzuki
- Subjects
Physics ,Strongly Correlated Electrons (cond-mat.str-el) ,Condensed matter physics ,Hydrostatic pressure ,FOS: Physical sciences ,General Physics and Astronomy ,Condensed Matter - Strongly Correlated Electrons ,Excited state ,Electric field ,Quantum critical point ,Antiferromagnetism ,Kondo effect ,Ground state ,Néel temperature - Abstract
We report the transport and thermodynamic properties under hydrostatic pressure in the antiferromagnetic Kondo compound CeMg2Cu9 with a two-dimensional arrangement of Ce atoms. Magnetic specific heat Cmag(T) shows a Schottky-type anomaly around 30 K originating from the crystal electric field (CEF) splitting of the 4f state with the first excited level at \Delta_{1}/kB = 58 K and the second excited level at \Delta_{2}/kB = 136 K from the ground state. Electric resistivity shows a two-peaks structure due to the Kondo effect on each CEF level around T_{1}^{max} = 3 K and T_{2}^{max} = 40 K. These peaks merge around 1.9 GPa with compression. With increasing pressure, Neel temperature TN initially increases and then change to decrease. TN finally disappears at the quantum critical point Pc = 2.4 GPa., Comment: 10 pages, 6 figures
- Published
- 2004