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One-dimensional quantum antiferromagnetism in the p-orbital CsO2 compound revealed by electron paramagnetic resonance

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Sans,  A.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Adler,  Peter
Peter Adler, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Jansen,  Martin
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Knaflič, T., Klanjšek, M., Sans, A., Adler, P., Jansen, M., Felser, C., et al. (2015). One-dimensional quantum antiferromagnetism in the p-orbital CsO2 compound revealed by electron paramagnetic resonance. Physical Review B, 91(17): 174419, pp. 1-5. doi:10.1103/PhysRevB.91.174419.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-9CE5-D
Abstract
Recently, it was proposed that the orbital ordering of pi(x,y)* molecular orbitals in the superoxide CsO2 compound leads to the formation of spin-1/2 chains below the structural phase transition occurring at T-s1 = 61 K on cooling. Here we report a detailed X-band electron paramagnetic resonance (EPR) study of this phase in CsO2 powder. The EPR signal appears as a broad line below T-s1, which is replaced by the antiferromagnetic resonance below the Neel temperature T-N = 8.3 K. The temperature dependence of the EPR linewidth between T-s1 and T-N agrees with the predictions for the one-dimensional Heisenberg antiferromagnetic chain of S = 1/2 spins in the presence of symmetric anisotropic exchange interaction. Complementary analysis of the EPR line shape, linewidth, and the signal intensity within the Tomonaga-Luttinger liquid (TLL) framework allows for a determination of the TLL exponent K = 0.48. Present EPR data thus fully comply with the quantum antiferromagnetic state of spin-1/2 chains in the orbitally ordered phase of CsO2, which is therefore a unique p-orbital system where such a state could be studied.