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Muon Spin Relaxation and Electron/Neutron Diffraction Studies of BaTi2(As1-xSbx)2O: Absence of Static Magnetism and Superlattice Reflections



Y. Nozaki, K. Nakano, T. Yajima, H. Kageyama, B. Frandsen, L Liu, S. Cheung, T. Goko, Y. J. Uemura, T.S.J. Munsie, T. Medina, G. M. Luke, J. Munevar, D. Nishio-Hamane, Craig Brown


We present the results of muon spin relaxation/rotation, transmission electron microscopy, and neutron diffraction measurements performed on several specimens of BaTi2(As1-xSbx)2O, which is known to have either charge density or spin density wave ordering at a temperature TDW, for all x, and superconductivity below a critical temperature Tc ≅1 K for x = 1. Zero-field muon spin relaxation measurements show no significant increase in relaxation rate at the density wave ordering temperature for any composition, indicating that the density wave is of the charge rather than spin type. The absence of any superstructure peaks in high-resolution electron and neutron diffraction below TDW suggests that the charge density wave does not involve modulation of atomic arrangement. Transverse field muon spin rotation measurements reveal a robust superconducting state below Tc ≅ 1 K for x = 1.
Physical Review B


neutron diffraction , magnetism, muon


Nozaki, Y. , Nakano, K. , Yajima, T. , Kageyama, H. , Frandsen, B. , Liu, L. , Cheung, S. , Goko, T. , Uemura, Y. , Munsie, T. , Medina, T. , Luke, G. , Munevar, J. , Nishio-Hamane, D. and Brown, C. (2013), Muon Spin Relaxation and Electron/Neutron Diffraction Studies of BaTi<sub>2</sub>(As<sub>1-x</sub>Sb<sub>x</sub>)<sub>2</sub>O: Absence of Static Magnetism and Superlattice Reflections, Physical Review B, [online], (Accessed December 4, 2023)
Created December 5, 2013, Updated October 12, 2021