Coexistence of superconductivity and density wave in $\mathrm{B}{\mathrm{a}}_2\mathrm{T}{\mathrm{i}}_2\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_4\mathrm{O}$: an optical spectroscopy study

Abstract

We performed an optical spectroscopy measurement on single crystals of $\mathrm{B}{\mathrm{a}}_2\mathrm{T}{\mathrm{i}}_2\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_4\mathrm{O}$, which is a newly discovered superconductor showing a coexistence of superconductivity and density wave order. The study reveals a spectral change related to the formation density wave energy gap below $T_{DW}\approx$125 K, leading to the removal of about half of the multiple Fermi surface sheets. The ratio of 2${\Delta }_{DW}$/$k_B{T}_{DW}\approx$ 11.9 is considerably larger than the mean-field value based on the weak-coupling BCS theory. At the lowest temperature in the superconducting state, we observed opening of superconducting energy gaps ${\Delta }_1(0)=3.4$ meV and ${\Delta }_2(0)=7.9$ meV. The properties of superconducting state in $\mathrm{B}{\mathrm{a}}_2\mathrm{T}{\mathrm{i}}_2\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_4\mathrm{O}$ are similar to that in $\mathrm{BaF}{\mathrm{e}}_{1.85}\mathrm{C}{\mathrm{o}}_{0.15}\mathrm{A}{\mathrm{s}}_2$.

arXiv comment5 pages, 5 figures

References in corpus (17)

• Origin of the spin density wave instability in AFe${}_2$As${}_2$ (A=Ba, Sr) as revealed by optical spectroscopy
• Amplitude `Higgs' mode in 2H-NbSe2 Superconductor
• Universal Decomposition of the Low-Frequency Conductivity Spectra of Iron-Pnictides Uncovering Fermi-Liquid Behavior
• Evolution of the optical spectrum with doping in iron pnictides Ba(Fe1-xCox)2As2
• Chemistry of layered d-metal pnictide oxides and their potential as candidates for new superconductors
• Ba1-xNaxTi2Sb2O (0.0 <= x <= 0.33): A Layered Titanium-based Pnictide Oxide Superconductor
• Evidence for multiple superconducting gaps in optimally doped BaFe${}_{1.87}$Co${}_{0.13}$As${}_2$ from infrared spectroscopy
• Optical properties of the iron-arsenic superconductor BaFe1.85Co0.15As2
• Optical properties of BaFe${}_{2-x}$Co${}_x$As${}_2$
• Electronic structure, disconnected Fermi surfaces and antiferromagnetism in the layered pnictide superconductor Na${}_x$Ba${}_{1-x}$Ti${}_2$Sb${}_2$O
• S wave superconductivity in newly discovered superconductor BaTi${}_2$Sb${}_2$O revealed by ${}^{121/123}$Sb-NMR/Nuclear Quadrupole Resonance measurements
• Superconductivity, charge- or spin-density wave, and metal-nonmetal transition in BaTi${}_2$(Sb${}_{1-x}$Bi${}_x$)${}_2$O
• Electron-phonon superconductivity and charge density wave instability in the layered titanium-based pnictide BaTi${}_2$Sb${}_2$O
• Superconductivity in Ba1-xKxTi2Sb2O (0 < x < 1) controlled by charge doping
• Superconductivity in rubidium substituted Ba1-xRbxTi2Sb2O
• Layered pnictide-oxide Na${}_2$Ti${}_2$Pn${}_2$O (Pn=As, Sb): a paradigm for spin density waves
• Revealing multiple density wave orders in non-superconducting titanium oxypnictide Na${}_2$Ti${}_2$As${}_2$O

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