J. Prost and P. G. De-gennes, The Physics of Liquid Crystals, 1995.

E. Fradkin, S. A. Kivelson, M. J. Lawler, J. P. Eisenstein, and A. P. Mackenzie, Nematic Fermi Fluids in Condensed Matter Physics, Annual Review of Condensed Matter Physics, vol.1, issue.1, p.153, 2010.
DOI : 10.1146/annurev-conmatphys-070909-103925

M. P. Lilly, K. B. Cooper, J. P. Eisenstein, L. N. Pfeiffer, and K. W. West, Evidence for an Anisotropic State of Two-Dimensional Electrons in High Landau Levels, Physical Review Letters, vol.82, issue.2, p.394, 1999.
DOI : 10.1103/PhysRevLett.82.394

C. Fang, H. Yao, W. Tsai, J. Hu, and S. A. Kivelson, Theory of electron nematic order in LaFeAsO, Physical Review B, vol.77, issue.22, p.224509, 2008.
DOI : 10.1103/PhysRevB.77.224509

C. Xu, M. Muller, and S. Sachdev, Ising and spin orders in the iron-based superconductors, Physical Review B, vol.78, issue.2, p.20501, 2008.
DOI : 10.1103/PhysRevB.78.020501

M. A. Tanatar, crystals: Optical and transport study, Physical Review B, vol.81, issue.18, p.184508, 2010.
DOI : 10.1103/PhysRevB.81.184508

J. Chu, H. Kuo, J. G. Analytis, and I. R. Fisher, Divergent Nematic Susceptibility in an Iron Arsenide Superconductor, Science, vol.337, issue.6095, p.710, 2012.
DOI : 10.1126/science.1221713

M. Nakajima, Unprecedented anisotropic metallic state in undoped iron arsenide BaFe2As2 revealed by optical spectroscopy, Proceedings of the National Academy of Sciences, vol.108, issue.30, p.12238, 2011.
DOI : 10.1073/pnas.1100102108

I. Paul, Magnetoelastic Quantum Fluctuations and Phase Transitions in the Iron Superconductors, Physical Review Letters, vol.107, issue.4, p.47004, 2011.
DOI : 10.1103/PhysRevLett.107.047004

C. C. Lee, W. Yin, and W. Ku, Ferro-Orbital Order and Strong Magnetic Anisotropy in the Parent Compounds of Iron-Pnictide Superconductors, Physical Review Letters, vol.103, issue.26, p.267001, 2009.
DOI : 10.1103/PhysRevLett.103.267001

S. Onari and H. Kontani, Self-consistent Vertex Correction Analysis for Iron-based Superconductors: Mechanism of Coulomb Interaction-Driven Orbital Fluctuations, Physical Review Letters, vol.109, issue.13, p.137001, 2012.
DOI : 10.1103/PhysRevLett.109.137001

R. M. Fernandes and J. Schmalian, Manifestations of nematic degrees of freedom in the magnetic, elastic, and superconducting properties of the iron pnictides, Superconductor Science and Technology, vol.25, issue.8, p.84005, 2012.
DOI : 10.1088/0953-2048/25/8/084005

S. Ishida, Superconductors Induced by Impurity Scattering in the Antiferromagnetic Orthorhombic Phase, Physical Review Letters, vol.110, issue.20, p.207001, 2013.
DOI : 10.1103/PhysRevLett.110.207001

T. P. Devereaux and R. Hackl, Inelastic light scattering from correlated electrons, Reviews of Modern Physics, vol.79, issue.1, p.175, 2007.
DOI : 10.1103/RevModPhys.79.175

H. Yamase and R. Zeyher, Electronic Raman scattering from orbital nematic fluctuations, Physical Review B, vol.88, issue.12, p.125120, 2013.
DOI : 10.1103/PhysRevB.88.125120

L. Chauvì-ere, studied by Raman spectroscopy, Physical Review B, vol.80, issue.9, p.94504, 2009.
DOI : 10.1103/PhysRevB.80.094504

R. M. Fernandes, A. E. Bohmer, C. Meingast, and J. Schmalian, Scaling between Magnetic and Lattice Fluctuations in Iron Pnictide Superconductors, Physical Review Letters, vol.111, issue.13, p.137001, 2013.
DOI : 10.1103/PhysRevLett.111.137001

Y. Nakai, probed with NMR measurements, Physical Review B, vol.87, issue.17, p.174507, 2012.
DOI : 10.1103/PhysRevB.87.174507