Pressure-induced structural, magnetic, and transport transitions in the two-legged ladder Sr3Fe2O5

Takafumi Yamamoto, Cédric Tassel, Yoji Kobayashi, Takateru Kawakami, Taku Okada, Takehiko Yagi, Hideto Yoshida, Takanori Kamatani, Yoshitaka Watanabe, Takumi Kikegawa, Mikio Takano, Kazuyoshi Yoshimura, Hiroshi Kageyama

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

The layered compound SrFeO2 with an FeO4 square-planar motif exhibits an unprecedented pressure-induced spin state transition (S = 2 to 1), together with an insulator-to-metal (I-M) and an antiferromagnetic-to-ferromagnetic (AFM-FM) transition. In this work, we have studied the pressure effect on the structural, magnetic, and transport properties of the structurally related two-legged spin ladder Sr 3Fe2O5. When pressure was applied, this material first exhibited a structural transition from Immm to Ammm at P s = 30 ± 2 GPa. This transition involves a phase shift of the ladder blocks from (1/2,1/2,1/2) to (0,1/2,1/2), by which a rock-salt type SrO block with a 7-fold coordination around Sr changes into a CsCl-type block with 8-fold coordination, allowing a significant reduction of volume. However, the S = 2 antiferromagnetic state stays the same. Next, a spin state transition from S = 2 to S = 1, along with an AFM-FM transition, was observed at Pc = 34 ± 2 GPa, similar to that of SrFeO2. A sign of an I-M transition was also observed at pressure around Pc. These results suggest a generality of the spin state transition in square planar coordinated S = 2 irons of n-legged ladder series Srn+1FenO 2n+1 (n = 1, 2, 3,...). It appears that the structural transition independently occurs without respect to other transitions. The necessary conditions for a structural transition of this type and possible candidate materials are discussed. © 2011 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)6036-6043
Number of pages8
JournalJournal of the American Chemical Society
Volume133
Issue number15
DOIs
StatePublished - Apr 20 2011
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Colloid and Surface Chemistry
  • General Chemistry
  • Catalysis

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