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J. M. Caron; J. R. Neilson; D. C. Miller; K. Arpino; A. Llobet; T. M. McQueen

doi:10.1103/PhysRevB.85.180405

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Orbital-selective magnetism in the spin-ladder iron selenides Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ Se $_{3}$

J. M. Caron¹, J. R. Neilson^1,*, D. C. Miller¹, K. Arpino¹, A. Llobet², and T. M. McQueen^1,†

¹Institute for Quantum Matter, Department of Chemistry, and Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21030, USA
²Lujan Neutron Scattering Center, Los Alamos National Laboratory, Mail Stop H805, Los Alamos, New Mexico 87545, USA

^*jneilso2@jhu.edu
^†mcqueen@jhu.edu

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Phys. Rev. B 85, 180405(R) – Published 14 May, 2012

DOI: https://doi.org/10.1103/PhysRevB.85.180405

Abstract

Here we show that the 2.80(8) $μ_{B}$ Fe $^{- 1}$ block antiferromagnetic order of BaFe $_{2}$ Se $_{3}$ transforms into stripe antiferromagnetic order in KFe $_{2}$ Se $_{3}$ with a decrease in moment to 2.1(1) $μ_{B}$ Fe $^{- 1}$ . This reduction is larger than expected from the change in electron count from Ba $^{2 +}$ to K $^{+}$ , and occurs with the loss of the displacements of Fe atoms from ideal positions in the ladders, as found by neutron pair distribution function analysis. Intermediate compositions remain insulating, and magnetic susceptibility measurements show a suppression of magnetic order and probable formation of a spin glass. Together, these results imply an orbital-dependent selection of magnetic versus bonded behavior, driven by relative bandwidths and fillings.

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Orbital-selective magnetism in the spin-ladder iron selenides Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ Se $_{3}$

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Orbital-selective magnetism in the spin-ladder iron selenides Ba1−xKxFe2Se3

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Orbital-selective magnetism in the spin-ladder iron selenides Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ Se $_{3}$