TY - JOUR
T1 - Charge-induced nematicity in FeSe
AU - Massat, Pierre
AU - Farina, Donato
AU - Paul, Indranil
AU - Karlsson, Sandra
AU - Strobel, Pierre
AU - Toulemonde, Pierre
AU - Méasson, Marie Aude
AU - Cazayous, Maximilien
AU - Sacuto, Alain
AU - Kasahara, Shigeru
AU - Shibauchi, Takasada
AU - Matsuda, Yuji
AU - Gallais, Yann
N1 - Funding Information:
We thank G. Blumberg, V. Brouet, A. V. Chubukov, V. D. Fil, R. Hackl, and J. Schmalian for fruitful discussions. P.M., M.-A.M., M.C., A.S., and Y.G. acknowledge financial support from ANR Grant "Pnictides, " from a Labex SEAM grant, and from a SESAME grant from r?gion Ile-de-France. P.T. and S. Karlsson acknowledge the financial support of UJF (now integrated inside "Universit? Grenoble Alpes") and Grenoble INP (through the AGIR-2013 contract of S. Karlsson). S. Kasahara., T.S., and Y.M. acknowledge the support of Grants-in-Aid for Scientific Research (KAKENHI) from Japan Society for the Promotion of Science (JSPS), and the Topological Quantum Phenomena (25103713) Grant-in-Aid for Scientific Research on Innovative Areas from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.
PY - 2016/8/16
Y1 - 2016/8/16
N2 - The spontaneous appearance of nematicity, a state of matter that breaks rotation but not translation symmetry, is one of the most intriguing properties of the iron-based superconductors (Fe SC), and has relevance for the cuprates as well. Establishing the critical electronic modes behind nematicity remains a challenge, however, because their associated susceptibilities are not easily accessible by conventional probes. Here, using FeSe as a model system, and symmetry-resolved electronic Raman scattering as a probe, we unravel the presence of critical charge nematic fluctuations near the structural/nematic transition temperature, TS ∼ 90 K. The diverging behavior of the associated nematic susceptibility foretells the presence of a Pomeranchuk instability of the Fermi surface with d-wave symmetry. The excellent scaling between the observed nematic susceptibility and elastic modulus data demonstrates that the structural distortion is driven by this d-wave Pomeranchuk transition. Our results make a strong case for chargeinduced nematicity in FeSe.
AB - The spontaneous appearance of nematicity, a state of matter that breaks rotation but not translation symmetry, is one of the most intriguing properties of the iron-based superconductors (Fe SC), and has relevance for the cuprates as well. Establishing the critical electronic modes behind nematicity remains a challenge, however, because their associated susceptibilities are not easily accessible by conventional probes. Here, using FeSe as a model system, and symmetry-resolved electronic Raman scattering as a probe, we unravel the presence of critical charge nematic fluctuations near the structural/nematic transition temperature, TS ∼ 90 K. The diverging behavior of the associated nematic susceptibility foretells the presence of a Pomeranchuk instability of the Fermi surface with d-wave symmetry. The excellent scaling between the observed nematic susceptibility and elastic modulus data demonstrates that the structural distortion is driven by this d-wave Pomeranchuk transition. Our results make a strong case for chargeinduced nematicity in FeSe.
KW - Nematicity
KW - Raman scattering
KW - Superconductivity
UR - http://www.scopus.com/inward/record.url?scp=84982085219&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84982085219&partnerID=8YFLogxK
U2 - 10.1073/pnas.1606562113
DO - 10.1073/pnas.1606562113
M3 - Article
AN - SCOPUS:84982085219
SN - 0027-8424
VL - 113
SP - 9177
EP - 9181
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 33
ER -