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Phonon-Modulated Magnetic Interactions and Spin Tomonaga-Luttinger Liquid in the p-Orbital Antiferromagnet CsO2

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

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Adler,  P.
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,  C.
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Klanjsek, M., Arcon, D., Sans, A., Adler, P., Jansen, M., & Felser, C. (2015). Phonon-Modulated Magnetic Interactions and Spin Tomonaga-Luttinger Liquid in the p-Orbital Antiferromagnet CsO2. Physical Review Letters, 115(5): 7205, pp. 1-6. doi:10.1103/PhysRevLett.115.057205.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-3C16-A
Abstract
The magnetic response of antiferromagnetic CsO2, coming from the p-orbital S = 1/2 spins of anionic O-2(-) molecules, is followed by Cs-133 nuclear magnetic resonance across the structural phase transition occurring at T-s1 = 61 K on cooling. Above T-s1, where spins form a square magnetic lattice, we observe a huge, nonmonotonic temperature dependence of the exchange coupling originating from thermal librations of O-2(-) molecules. Below T-s1, where antiferromagnetic spin chains are formed as a result of p-orbital ordering, we observe a spin Tomonaga-Luttinger-liquid behavior of spin dynamics. These two interesting phenomena, which provide rare simple manifestations of the coupling between spin, lattice, and orbital degrees of freedom, establish CsO2 as a model system for molecular solids.