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

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arxiv 1401.7897 v2 pith:ISZZ2TIM submitted 2014-01-30 cond-mat.supr-con

S. Ideta , T. Yoshida , M. Nakajima , W. Malaeb , H. Kito , H. Eisaki , A. Iyo , Y. Tomioka
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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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keywords baniobservedangle-resolvedaroundelectronfermiholeindicating
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abstract

We have performed an angle-resolved photoemission spectroscopy (ARPES) study of BaNi$_2$P$_2$ which shows a superconducting transition at $T_c$ $\sim$ 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 $m^*$/$m_b$ $\leq$ 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 BaNi$_2$As$_2$ and may be related to the higher $T_c$ of BaNi$_2$P$_2$.

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