Neutron diffraction studies of the magnetoelastic compounds Tb5SixGe4x (x=2.2 and 2.5)

V. O. Garlea, J. L. Zarestky, C. Y. Jones, L.-L. Lin, D. L. Schlagel, T. A. Lograsso, A. O. Tsokol, V. K. Pecharsky, K. A. Gschneidner, Jr., and C. Stassis
Phys. Rev. B 72, 104431 – Published 23 September 2005

Abstract

We report the results of a neutron diffraction study, carried out on both single crystalline and polycrystalline samples of Tb5Si2.2Ge1.8 and polycrystalline Tb5Si2.5Ge1.5. On cooling, at approximately 120 K, the Tb5Si2.2Ge1.8 system undergoes a magnetoelastic transition from a high-temperature monoclinic-paramagnetic to a low-temperature orthorhombic-ferromagnetic structure. Between 120 K and 75 K, the magnetic structure has a net ferromagnetic component along the a axis direction. The moments are slightly canted with respect to the a axis, while the components along the b and c axes are ordered antiferromagnetically. A second magnetic transition occurs at approximately 75 K. Below this temperature, the magnetic structure consists of ferromagnetically aligned μx and μz projections of the magnetic moments and an antiferromagnetic arrangement of the μy moment components. Magnetic structures of Tb5Si2.5Ge1.5 are nearly identical to those of Tb5Si2.2Ge1.8.

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  • Received 5 March 2005

DOI:https://doi.org/10.1103/PhysRevB.72.104431

©2005 American Physical Society

Authors & Affiliations

V. O. Garlea1,*, J. L. Zarestky1, C. Y. Jones2, L.-L. Lin1, D. L. Schlagel3, T. A. Lograsso3, A. O. Tsokol3, V. K. Pecharsky3,4, K. A. Gschneidner, Jr.3,4, and C. Stassis1

  • 1Ames Laboratory and Department of Physics, Iowa State University, Ames, Iowa 50011, USA
  • 2National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 3Materials and Engineering Physics Program, Ames Laboratory, Ames, Iowa 50011, USA
  • 4Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA

  • *Electronic address: garleao@ornl.gov

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Vol. 72, Iss. 10 — 1 September 2005

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