Uncharacteristic phase separation trends with the ionic size in cobaltites

J. Yu, Despina Louca, D. Phelan, K. Tomiyasu, K. Horigane, K. Yamada

研究成果: Article査読

13 被引用数 (Scopus)

抄録

Using elastic neutron scattering on single crystals of La1-x Ax CoO3 (A= Ca2+, Sr2+, and Ba2+), we found the development of magnetic superstructures below the global magnetic transition to be strongly dependent on the size of the A -site dopant, ( rA ), in an unusual way. Upon reducing the (rA ) (i.e., as with Ca doping), only a commensurate ferromagnetic cluster phase is evident. On expanding the ( rA ), the tendency toward coexistence of competing ferromagnetic and antiferromagnetic orders increases giving rise to an inhomogeneous ground state. The antiferromagnetic ordered state, initially incommensurate, continuously strengthens and becomes commensurate with long-range order and a characteristic cubic wave vector of Qc = (0.25,0.25,0.25) with x. The two competing order parameters become comparable in magnitude indicative of the phase-separated nature of the cobalt perovskite system.

本文言語English
論文番号052402
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
80
5
DOI
出版ステータスPublished - 2009 8 17

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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