Spin Blockade, Orbital Occupation, and Charge Ordering in La1.5Sr0.5CoO4

Chang, C. F.; Hu, Z.; Wu, Hua; Burnus, T.; Hollmann, N.; Benomar, M.; Lorenz, T.; Tanaka, A.; Lin, H. -J.; Hsieh, H. H.; Chen, C. T.; Tjeng, L. H.

doi:10.1103/PhysRevLett.102.116401

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Spin Blockade, Orbital Occupation, and Charge Ordering in La_1.5Sr_0.5CoO₄

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Chang, C. F., Hu, Z., Wu, H., Burnus, T., Hollmann, N., Benomar, M., et al. (2009). Spin Blockade, Orbital Occupation, and Charge Ordering in La_1.5Sr_0.5CoO₄. Physical Review Letters, 102(11): 116401, pp. 1-4. doi:10.1103/PhysRevLett.102.116401.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-0FAB-1

Abstract

Using Co-L-2,L-3 and O-K x-ray absorption spectroscopy, we reveal that the charge ordering in La1.5Sr0.5CoO4 involves high spin (S=3/2) Co2+ and low spin (S=0) Co3+ ions. This provides evidence for the spin-blockade phenomenon as a source for the extremely insulating nature of the La2-xSrxCoO4 series. The associated e(g)(2) and e(g)(0) orbital occupation accounts for the large contrast in the Co-O bond lengths and, in turn, the high charge ordering temperature. Yet, the low magnetic ordering temperature is naturally explained by the presence of the nonmagnetic (S=0) Co3+ ions. From the identification of the bands we infer that La1.5Sr0.5CoO4 is a narrow band material.