Mandujano H Cein, Gonzalez Sandra L, Episcopo Nathan, Sitharaman Uma, Poudel Narayan, Gofryk Krzysztof, Garay Yahir E, Lopez Jorge A, Zhang Qiang, Calder Stuart, Nair Harikrishnan S
Department of Physics, 500 W University Ave, University of Texas at El Paso, El Paso, TX 79968, United States of America.
Department of Chemistry, University of Delhi, Delhi-110007, India.
J Phys Condens Matter. 2021 Jun 4;33(29). doi: 10.1088/1361-648X/abff90.
Li((LiCr)(Te/Sb))Ocompounds where Cr atoms along with Li and Te or Sb are part of a honeycomb and are studied using magnetic susceptibility, specific heat, x-ray photoelectron spectroscopy and neutron diffraction. The oxides stoichiometries as determined from the neutron diffraction studies are LiCrTeOand LiCrSbOwith a stable oxidation state of +3 for Cr. Both the compounds crystallize in space group2/with intermixing of cations at the 4sites leaving the 2sites preferentially for Te or Sb. Again, the Liions alone predominantly occur in the interlayer sites. Both the compounds show a broad anomaly in specific heat at 8 K, which is robust against 8 T. A corresponding anomaly is absent in the magnetic susceptibility but recovers from its derivative, d()/d. We ascertain the magnetic anomaly temperatures () of LiCrTeOand LiCrSbOas 5.9 K and 6.7 K respectively from specific heat. Although the physical properties indicated a low temperature anomaly, neutron diffraction data did not reveal a magnetic signal or a structural anomaly down to 1.5 K. This rules out a conventional long-range ordered magnetic ground state in either compounds. Combining the results from specific heat, neutron diffraction and electron paramagnetic resonance, we put forth a scenario of depleted honeycomb lattice of Crwith predominant short-range magnetic correlations as the magnetic ground states of the title compounds.
