Revealing multiple density wave orders in non-superconducting titanium oxypnictide Na$_2$Ti$_2$As$_2$O

Y. Huang; H. P. Wang; R. Y. Chen; X. Zhang; P. Zheng; Y. G. Shi; N. L. Wang

doi:10.1103/PhysRevB.89.155120

paper

Revealing multiple density wave orders in non-superconducting titanium oxypnictide Na $_{2}$ Ti $_{2}$ As $_{2}$ O

arXiv:1401.7853 · doi:10.1103/PhysRevB.89.155120

Abstract

We report an optical spectroscopy study on the single crystal of Na $_{2}$ Ti $_{2}$ As $_{2}$ O, a sister compound of superconductor BaTi $_{2}$ Sb $_{2}$ O. The study reveals unexpectedly two density wave phase transitions. The first transition at 320 K results in the formation of a large energy gap and removes most part of the Fermi surfaces. But the compound remains metallic with residual itinerant carriers. Below 42 K, another density wave phase transition with smaller energy gap scale occurs and drives the compound into semiconducting ground state. These experiments thus enable us to shed light on the complex electronic structure in the titanium oxypnictides.

5 pages, 5 figures

References in corpus (8)

Origin of the spin density wave instability in AFe $_{2}$ As $_{2}$ (A=Ba, Sr) as revealed by optical spectroscopy
Ba1-xNaxTi2Sb2O (0.0 <= x <= 0.33): A Layered Titanium-based Pnictide Oxide Superconductor
Electronic structure, disconnected Fermi surfaces and antiferromagnetism in the layered pnictide superconductor Na $_{x}$ Ba $_{1 - x}$ Ti $_{2}$ Sb $_{2}$ O
Optical study of the charge-density-wave mechanism in 2 $H$ -TaS $_{2}$ and Na $_{x}$ TaS $_{2}$
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
Revealing Charge Density Wave Formation in the LaTe_2 System by Angle Resolved Photoemission Spectroscopy
Electron-phonon superconductivity and charge density wave instability in the layered titanium-based pnictide BaTi $_{2}$ Sb $_{2}$ O

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Revealing multiple density wave orders in non-superconducting titanium oxypnictide Na2​Ti2​As2​O

Abstract

References in corpus (8)

Cited by in corpus (7)

Revealing multiple density wave orders in non-superconducting titanium oxypnictide Na $_{2}$ Ti $_{2}$ As $_{2}$ O