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Electronic structure of BaNi$_2$P$_2$ observed by angle-resolved photoemission spectroscopy

Superconductivity 2015-08-06 v2
Authors: S. Ideta , T. Yoshida , M. Nakajima , W. Malaeb , H. Kito , H. Eisaki , A. Iyo , Y. Tomioka , T. Ito , K. Kihou , C. H. Lee , Y. Kotani , K. Ono , S. K. Mo , Z. Hussain , Z. -X. Shen , H. Harima , S. Uchida , A. Fujimori
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Abstract

We have performed an angle-resolved photoemission spectroscopy (ARPES) study of BaNi2_2P2_2 which shows a superconducting transition at TcT_c ∼\sim 2.5 K. We observed hole and electron Fermi surfaces (FSs) around the Brillouin zone center and corner, respectively, and the shapes of the hole FSs dramatically changed with photon energy, indicating strong three-dimensionality. The observed FSs are consistent with band-structure calculation and de Haas-van Alphen measurements. The mass enhancement factors estimated in the normal state were m∗m^*/mbm_b ≤\leq 2, indicating weak electron correlation compared to typical iron-pnictide superconductors. An electron-like Fermi surface around the Z point was observed in contrast with BaNi2_2As2_2 and may be related to the higher TcT_c of BaNi2_2P2_2.

Keywords

electronic structure bani2p2 angle-resolved photoemission spectroscopy arpes fermi surface superconductivity electron correlation

Cite

@article{arxiv.1401.7897,
  title  = {Electronic structure of BaNi$_2$P$_2$ observed by angle-resolved photoemission spectroscopy},
  author = {S. Ideta and T. Yoshida and M. Nakajima and W. Malaeb and H. Kito and H. Eisaki and A. Iyo and Y. Tomioka and T. Ito and K. Kihou and C. H. Lee and Y. Kotani and K. Ono and S. K. Mo and Z. Hussain and Z. -X. Shen and H. Harima and S. Uchida and A. Fujimori},
  journal= {arXiv preprint arXiv:1401.7897},
  year   = {2015}
}

Comments

6 figures

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