Three-dimensional electronic structure and interband nesting in the stoichiometric superconductor LiFeAs

We report the three-dimensional electronic structure of iron pnictide superconductor LiFeAs obtained by polarization-dependent angle-resolved photoemission spectroscopy. The obtained orbital characters of each Fermi surface (FS) as well as the band dispersions were qualitatively consistent with those derived from local density approximation band calculations. It was found that FS nesting appears between a two-dimensional hole band at the zone center and an electron band at the zone corner with the same ${d}_{xy}$ orbital character. A shadow band attributed to $(\ensuremath{\pi},\ensuremath{\pi},\ensuremath{\pi})$ band folding was also observed without the spin-density-wave transition. This result suggests that FS nesting between bands with the same orbital ${d}_{xy}$ character due to spin fluctuation plays an important role in LiFeAs.

[1]  Y. Li,et al.  Unconventional anisotropic s-wave superconducting gaps of the LiFeAs iron-pnictide superconductor. , 2011, Physical review letters.

[2]  T. Terashima,et al.  Nodal versus nodeless behaviors of the order parameters of LiFeP and LiFeAs superconductors from magnetic penetration-depth measurements. , 2011, Physical review letters.

[3]  T. Terashima,et al.  de Haas-van Alphen study of the Fermi surfaces of superconducting LiFeP and LiFeAs. , 2011, Physical review letters.

[4]  Jiangping Hu,et al.  Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li 1-x FeAs , 2011, 1104.3653.

[5]  T. Perring,et al.  Antiferromagnetic spin fluctuations in LiFeAs observed by neutron scattering , 2011, 1104.1609.

[6]  R. Arita,et al.  Two-dimensional and three-dimensional Fermi surfaces of superconducting BaFe2(As(1-x)P(x))2 and their nesting properties revealed by angle-resolved photoemission spectroscopy. , 2011, Physical review letters.

[7]  X. H. Chen,et al.  Electronic-structure-driven magnetic and structure transitions in superconducting NaFeAs single crystals measured by angle-resolved photoemission spectroscopy. , 2010, Physical review letters.

[8]  G. Chen,et al.  NMR evidence of strongly correlated superconductivity in LiFeAs: Tuning toward a spin-density-wave ordering , 2010, 1008.5199.

[9]  M. Katoh,et al.  SAMRAI: a novel variably polarized angle-resolved photoemission beamline in the VUV region at UVSOR-II. , 2010, The Review of scientific instruments.

[10]  Yoo Jang Song,et al.  Synthesis, anisotropy, and superconducting properties of LiFeAs single crystal , 2010, 1002.2249.

[11]  Timur K. Kim,et al.  Superconductivity without nesting in LiFeAs. , 2010, Physical review letters.

[12]  R. Arita,et al.  Phase diagram and gap anisotropy in iron-pnictide superconductors , 2009, 0912.1893.

[13]  Z. Hussain,et al.  Unconventional electronic reconstruction in undoped ( Ba , Sr ) Fe 2 As 2 across the spin density wave transition , 2009, 0909.0831.

[14]  Yong-Feng Li,et al.  Striped antiferromagnetic order and electronic properties of stoichiometric LiFeAs from first-principles calculations , 2009, 0905.3303.

[15]  R. Arita,et al.  Pnictogen height as a possible switch between high- T c nodeless and low- T c nodal pairings in the iron-based superconductors , 2009, 0904.2612.

[16]  Zhu-An Xu,et al.  Fermi surface nesting induced strong pairing in iron-based superconductors , 2008, Proceedings of the National Academy of Sciences.

[17]  Wei Bao,et al.  Neutron-diffraction measurements of magnetic order and a structural transition in the parent BaFe2As2 compound of FeAs-based high-temperature superconductors. , 2008, Physical review letters.

[18]  Nan Wang,et al.  Band structure and fermi surface of an extremely overdoped iron-based superconductor KFe2As2. , 2008, Physical review letters.

[19]  M. V. Sadovskii,et al.  Electronic structure of new LiFeAs high-Tc superconductor , 2008, 0807.1010.

[20]  M. Johannes,et al.  Unconventional superconductivity with a sign reversal in the order parameter of LaFeAsO1-xFx. , 2008, Physical review letters.

[21]  Hideo Hosono,et al.  Iron-based layered superconductor La[O(1-x)F(x)]FeAs (x = 0.05-0.12) with T(c) = 26 K. , 2008, Journal of the American Chemical Society.

[22]  Peter Blaha,et al.  Full-potential, linearized augmented plane wave programs for crystalline systems , 1990 .

[23]  R. Matzdorf.  Investigation of line shapes and line intensities by high-resolution UV-photoemission spectroscopy — Some case studies on noble-metal surfaces , 1998 .

[24]  S. M. Goldberg,et al.  Photoionization cross-sections for atomic orbitals with random and fixed spatial orientation , 1981 .