Fragile magnetic ground state in half-doped LaSr2Mn 2O7

J. S. Lee, C. C. Kao, C. S. Nelson, H. Jang, K. T. Ko, S. B. Kim, Y. J. Choi, S. W. Cheong, S. Smadici, P. Abbamonte, J. H. Park

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Abstract

We investigated the orbital and antiferromagnetic ordering behaviors of the half-doped bilayer manganite La2-2xSr1+2xMn 2O7 (x < 0.5) by using Mn L2,3-edge resonant soft x-ray scattering. Resonant soft x-ray scattering reveals the CE-type orbital order below Too220K, which shows partial melting behavior below Tm165K. We also found coexistence CE- and A-type antiferromagnetic orders. Both orders involve the CE-type orbital order with nearly the same orbital character and are coupled with each other. These results manifest that the ground state with the CE-type antiferromagnetic order is easily susceptible to destabilization into the A-type one even with a small fluctuation of the doping level, as suggested by the extremely narrow magnetic phase boundaries at x < 0.5±0.005.

Original languageEnglish
Article number037206
JournalPhysical Review Letters
Volume107
Issue number3
DOIs
Publication statusPublished - 2011 Jul 15

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Lee, J. S., Kao, C. C., Nelson, C. S., Jang, H., Ko, K. T., Kim, S. B., Choi, Y. J., Cheong, S. W., Smadici, S., Abbamonte, P., & Park, J. H. (2011). Fragile magnetic ground state in half-doped LaSr2Mn 2O7. Physical Review Letters, 107(3), [037206]. https://doi.org/10.1103/PhysRevLett.107.037206