Polarized neutron investigation of charge-ordering in mixed-valence Sm4Bi3

J. X. Boucherle, F. Givord, J. Schweizer, J. M. Mignot, E. Lelièvre-Berna, Hayuyoshi Aoki, A. Ochiai

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)


Cubic Sm4Bi3 undergoes a first-order transition into a rhombohedral phase at about 260 K. This change has been ascribed to a charge-ordering transition from the thermal valence fluctuating state into a static mixture of di- and trivalent sites. In order to determine the positions of the Sm2+ and Sm3+ ions below the transition temperature, we have investigated a Sm4Bi3 single crystal by polarized neutron diffraction. A uniaxial pressure was applied along the [1 1 1] direction to avoid the formation of domains. The rhombohedral nuclear structure was first refined using unpolarized neutron measurements. From the flipping ratios measured with polarized neutrons at T = 6 K in a magnetic field of 4.6 T applied along the [1̄ 0 1] rhombohedral direction, the two Sm sites were found to have different magnetic characters: SmI, along the compressed diagonal of the cube, carries a moment of 0.017(5)μB with a Sm3+ form factor, whereas SmII, along the other diagonals, carries a moment of 0.063(5)μB with a Sm2+ form factor.

Original languageEnglish
Pages (from-to)47-50
Number of pages4
JournalPhysica B: Condensed Matter
Publication statusPublished - 1999 Jun
Externally publishedYes
EventProceedings of the 1998 2nd International Workshop on Polarised Neutrons for Condensed Matter Investigations, PNCMI '98 - Grenoble
Duration: 1998 Sep 211998 Sep 23

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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