Heavy Fermion Superconductivity:

Competition and Cooperation of Spin Fluctuations and Valence Fluctuations

Kazumasa Miyake

Graduate School of Engineering Science, Osaka University, Japan


    Following points will be discussed.

1)Fundamental concepts for heavy fermion superconductivity, in relation to the heaviness of quasi-particles and mechanism of its superconductivity. 

2)Present status of experiments on the relation between antiferromagnetism and valence transition in heavy fermion metals in relation to aspects of unconventional superconductivity.

3)Theoretical wisdom obtained so far for understanding fundamental properties presented in part 2) on the basis of valence fluctuation mechanism.

4)Perspective of phenomena due to critical valence fluctuations, and some speculations on high-Tc cuprates.



References


[1] K. Miyake: J. Phys.: Condens. Matter 19 (2007) 125201.

[2] S. Watanabe, A. Tsuruta, K. Miyake, and J. Flouquet: Phys. Rev. Lett. 100 (2008) 236401.

[3] S. Watanabe and K. Miyake, J. Phys. Soc. Jpn. 79 (2010) 033707.

[4] S. Watanabe and K. Miyake: Phys. Rev. Lett. 105 (2010) 186403.

[5] S. Watanabe and K. Miyake: J. Phys.: Condens. Matter 23 (2011) 094217.

click the picture to download