Two-Dimensional Fermi Surfaces in LaRuPO and LaFePO versus Three-Dimensional Fermi Surfaces in LaFe2P2

Hiroshi Muranaka,Hiroshi Yamagami,Yusuke Doi,Yoshinori Haga,Fuminori Honda,Hitoshi Sugawara,Rikio Settai,Yoshichika Ōnuki,Tatsuma D Matsuda,Keisuke Katayama

doi:10.1143/jpsj.78.053705

Abstract

We succeeded in observing the de Haas–van Alphen (dHvA) effect in LaRuPO, which is a sister compound of iron-based oxypnictide superconductors. All the detected dHvA frequencies, which correspond to the maximum or minimum cross-sectional areas of Fermi surfaces, approximately follow the 1/cos θ dependence, where θ is a field-tilted angle from the tetragonal [001] direction to the [100] and [110] directions. The Fermi surfaces are found to consist of two cylindrical hole Fermi surfaces and two cylindrical electron Fermi surfaces on the basis of the similar cylindrical Fermi surfaces in LaFePO and the result of energy band calculations. The cyclotron effective mass in LaRuPO is light, ranging from 0.55 to 0.86 m 0 , which is compared with a large cyclotron mass in LaFePO. These two-dimensional Fermi surfaces in LaRuPO and LaFePO are also compared with the three-dimensional Fermi surfaces in LaFe 2 P 2 .

Highlights

Hiroshi M URANAKA1, Yusuke D OI1, Keisuke K ATAYAMA1, Hitoshi S UGAWARA2, Rikio S ETTAI1, Fuminori H ONDA1, Tatsuma D
Four cylindrical Fermi surfaces, together with a small closed Fermi surface, are expected from the result of energy band structure calculations for LaFePO.6) LaFePO is a compensated metal with equal volumes of electron and hole
We considered that the observed Fermi surfaces correspond to two electron corrugated Fermi surfaces, possessing the maximum and minimum cross-sectional areas, because the cyclotron mass of electron Fermi surfaces is expected to be light compared with that of hole Fermi surfaces from the result of our energy band calculations based on a fully-relativistic linear augmented-plane-wave (LAPW) method in a local density approximation.7) the cyclotron mass mc of two nearly cylindrical electron

Summary

Introduction

Hiroshi M URANAKA1 , Yusuke D OI1 , Keisuke K ATAYAMA1 , Hitoshi S UGAWARA2 , Rikio S ETTAI1 , Fuminori H ONDA1 , Tatsuma D. Two-Dimensional Fermi Surfaces in LaRuPO and LaFePO All the detected dHvA frequencies, which correspond to the maximum or minimum cross-sectional areas of Fermi surfaces, approximately follow the 1= cos dependence, where is a field-tilted angle from the tetragonal [001] direction to the [100]

Results

Conclusion