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

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-9CE5-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-173D-2
Genre: Journal Article

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 Creators:
Knaflič, Tilen1, Author
Klanjšek, Martin1, Author
Sans, A.2, Author              
Adler, Peter3, Author              
Jansen, Martin2, Author              
Felser, Claudia4, Author              
Arčon, Denis1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Peter Adler, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863435              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 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.

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Language(s): eng - English
 Dates: 2015-05-182015-05-18
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 91 (17) Sequence Number: 174419 Start / End Page: 1 - 5 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008