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Pressure Effect on Yb-Based Strongly Correlated Electron Systems

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Mito T., Otani M., Nakamura M., Koyama T., Wada S., Kotegawa H., Kobayashi T., Idzikowski B., Reiffers M., Sarrao J.

Acta Physica Polonica A

2009

vol. 115

issue 1

47-52

We studied pressure effects on YbCu_5 and YbInCu_4, good examples of the Yb-based compounds to investigate the nonmagnetic-magnetic transition in Yb-based strongly correlated electron systems. With increasing pressure, the low-temperature Fermi liquid state of YbCu_5 is gradually suppressed, suggesting the second-order like nonmagnetic-magnetic transition around the pressure of 5-6 GPa. On the other hand, in YbInCu_4 which has a pressure-induced magnetic ordered ground state above P_C=2.45 GPa, both high-temperature paramagnetic and low-temperature intermediate valence phases are insensitive to pressure. Our results confirm the first-order nature of the transition between the intermediate valence and magnetic ordered phases with pressure.

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1 Acta Physica Polonica A

1 2009

1 Idzikowski B.

1 Kobayashi T.

1 Kotegawa H.

1 Koyama T.

1 Mito T.

1 Nakamura M.

1 Otani M.

1 Reiffers M.

1 Sarrao J.

1 Wada S.

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Pressure Effect on Yb-Based Strongly Correlated Electron Systems