Factors governing Yb magnetism in Yb0.95PtIn2 and other MgCuAl2-type structures

Andrew C. Malingowski, Moosung Kim, Jue Liu, Liusuo Wu, Meigan C. Aronson, Peter G. Khalifah

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The ternary compound YbPtIn2 has been synthesized and its crystal structure determined using single crystal X-ray diffraction techniques. The compound crystallizes in the MgCuAl2 structure, a ternary structure type often formed when rare earth metals, Group 10 transition metals, and indium are present in a 1:1:2 ratio. The unit cell is C-centered orthorhombic, space group Cmcm (#63) with lattice parameters of a=4.3410(1) Å, b=10.3230(2) Å, and c=7.8510(2) Å. Evidence is found for a substantial non-stoichiometry on the Yb site, in contrast to the Pt and In sites which behave as expected, and it is believed that the stoichiometry of this compound is more properly described as Yb0.95PtIn2. Magnetic and resistivity measurements reveal that YbPtIn2 is a weakly interacting, non-magnetic metal exclusively containing Yb2+, and with a resistivity (ρ) varying from 34 μΩ cm at room temperature to a residual resistivity ρ0 of 23 μΩ cm at 1.8 K. Density functional theory calculations suggest that the observed diamagnetic Yb behavior is expected for this compound, but that certain substitutions on the Pt or In site could help stabilize magnetic Yb3+ and potentially induce heavy fermion behavior.

Original languageEnglish
Pages (from-to)308-315
Number of pages8
JournalJournal of Solid State Chemistry
Volume198
DOIs
StatePublished - Feb 2013
Externally publishedYes

Funding

The Stony Brook University single crystal diffractometer was obtained through the support of the National Science Foundation grant CHE-0840483 . Work at Brookhaven is supported by the US DOE under Contract no. DE-AC02-98CH10886 . Use of the National Synchrotron Light Source, Brookhaven National Laboratory, was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences , under Contract no. DE-AC02-98CH10886 . Particular thanks go to Dr. Jonathan Hanson for sharing his general expertise with synchrotron single crystal diffraction experiments and his specific experience with beamline X7B. Work at the Department of Physics and Astronomy, Stony Brook University (MSK, LSW, and MCA) was supported by the National Science Foundation under grant DMR-0907457 . We would like to thank the group of Prof. John Parise for the use of and training on their single crystal diffractometer, with particular thanks to Dr. Paul Forster. Additional thanks go to Dr. Yuri Janssen for helping facilitate bridging interactions between the chemistry and physics groups that carried out this work.

Keywords

  • COHP
  • DFT calculations
  • Electronic and magnetic properties
  • Intermetallic
  • Single crystal diffraction

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