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Journal Articles

Relativistic band-structure calculations for CeTIn$$_5$$(T=Ir and Co) and analysis of the energy bands by using tight-binding method

Maehira, Takahiro; Hotta, Takashi; Ueda, Kazuo; Hasegawa, Akira*

Journal of the Physical Society of Japan, 72(4), p.854 - 864, 2003/04

 Times Cited Count:74 Percentile:90.12(Physics, Multidisciplinary)

In order to investigate electronic properties of recently discovered heavy fermion superconductors CeTIn$$_5$$ (T=Ir and Co), we employ the relativistic linear augmented-plane-wave (RLAPW) method to clarify the energy band structures and Fermi surfaces of those materials.The obtained energy bands mainly due to the large hybridization between Ce $$4f$$ and In 5$$p$$ states well reproduce the Fermi surfaces consistent with the de Haas-van Alphen experimental results. For the purpose, we construct a tight-binding model for CeTIn$$_5$$ by including $$f$$-$$f$$ and $$p$$-$$p$$ hoppings as well as $$f$$-$$p$$ hybridization, which are expressed by the Slater-Koster integrals, determined by the direct comparison with the band-calculation result. Similarity and difference between CeIrIn$$_5$$ and CeCoIn$$_5$$ are discussed based on the obtained tight-binding model, suggesting a significant importance of the effect of crystalline electric field to understand the difference in electronic properties among CeTIn$$_5$$.

Oral presentation

Heterogeneous electronic state by Zn-substitutions in heavy fermion superconductor CeCoIn$$_5$$

Sakai, Hironori; Tokunaga, Yo; Haga, Yoshinori; Kambe, Shinsaku; Zhu, J.-X.*; Ronning, F.*; Ramakrishna, S. K.*; Reyes, A. P.*; Suzuki, Kohei*; Oshima, Yoshiki*; et al.

no journal, , 

Substitutions of In sites by Zn atoms in heavy fermion superconductor CeCoIn$$_5$$ is reported to induce an antiferromagnetic order by Yokoyama et al. in Ibaraki University. Near the critical region, non-Fermi-liquid behavior has been observed in magnetization and specific heat. We have performed NMR measurements to reveal the spin fluctuations near the critical region.

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