## Abstract

We found that the pseudo binary alloys (Mn_{1-x}Ru_{x})_{3}Ga, with 0.33 ≤ x ≤ 0.67, have an ordered b.c.c. structure. The lattice constant a is almost constant with respect to x: a = 6.000 Å for x = 0.33 and a = 5.992 Å for x = 0.67. For the alloy with x = 0.33, i.e. Mn_{2}RuGa, the magnetization is almost saturated in a field of 20 kOe. The saturation magnetization at 4.2 K is 23 emu/g, and the Curie temperature, T_{C}, is 460 K. The T_{C} of (Mn_{1-x}Ru_{x})_{3}Ga decreases almost linearly with increasing x, and it vanishes around x = 0.67 (MnRu_{2}Ga). We also determined atomic and magnetic structures from neutron diffraction experiments. The alloy Mn_{2}RuGa (x = 0.33) has an ordered structure of CuHg_{2}Ti type; the magnetic Mn atoms mainly occupy the 4a (0,0,0) and 4d (3/4, 3/4, 3/4) sites. We also observed that the magnetic moments of Mn atoms on the 4a and 4d sites are antiparallel to each other; values of the magnetic moment are μa = 4.6 and μ_{d} = 3.3 μ_{B} per Mn atom.

Original language | English |
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Pages (from-to) | S737-S739 |

Journal | Applied Physics A: Materials Science and Processing |

Volume | 74 |

Issue number | SUPPL.I |

DOIs | |

Publication status | Published - 2002 Dec 1 |

## ASJC Scopus subject areas

- Chemistry(all)
- Materials Science(all)