2020/01/26 by Toru Adachi, T. Adachi, M. Nakajima +4
Materials Science · Physics and Astronomy · #Atomic physics #Condensed matter physics #Critical point (mathematics) #Doping #Geometry #Iron-based superconductors research #Liquid crystal #Materials science #Nuclear magnetic resonance #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum critical point #Quantum mechanics #Quantum phase transition #Raman scattering #Raman spectroscopy #Resonance (particle physics) #Scattering #Spectral line #Superconductivity #Superconductivity in MgB2 and Alloys #Transition temperature #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.101.085102
published as Phys. Rev. B 101, 085102 (2020) · 6 pages, 7 figures, to be published in PRB
arxiv created 2020/01/26 · openalex created_date 2020/01/30 · openalex publication_date 2020/02/03 · arxiv updated 2020/02/05 · openalex updated_date 2026/08/05
We report comprehensive temperature and doping dependences of the Raman scattering spectra for BaFe2(As_1\ensuremath-xPx)2 (x=0, 0.07, 0.24, 0.32, and 0.38), focusing on the nematic fluctuation and the superconducting responses. With increasing x, the bare nematic transition temperature estimated from the Raman spectra reaches T=0 K at the optimal doping, which indicates a quantum critical point (QCP) at this composition. In the superconducting compositions, in addition to the pair-breaking peaks observed in the A1g and B1g spectra, another strong B1g peak appears below the superconducting transition temperature, which is ascribed to the nematic resonance peak. The observation of this peak indicates significant nematic correlations in the superconducting state near the QCP in this compound.