Fermi-surface topology of the iron pnictide LaFe$_2$P$_2$
  We report on a comprehensive de Haas--van Alphen (dHvA) study of the iron pnictide LaFe$_2$P$_2$. Our extensive density-functional band-structure calculations can well explain the measured angular-dependent dHvA frequencies. As salient feature, we observe only one quasi-two-dimensional Fermi-surface sheet, i.e., a hole-like Fermi-surface cylinder around $\Gamma$, essential for $s_\pm$ pairing, is missing. In spite of considerable mass enhancements due to many-body effects, LaFe$_2$P$_2$ shows no superconductivity. This is likely caused by the absence of any nesting between electron and hole bands. 
S. Blackburn, B. Pr\'evost, M. Bartkowiak, O. Ignatchik, A. Polyakov,   T. F\"orster, M. C\^ot\'e, G. Seyfarth, C. Capan, Z....
cond-mat.supr-con