X-Ray Study of Crystal Distortions in RMn2 Compounds (R: Y, Pr, Nd, Sm and Gd)

Yukiharu Tagawa, Junji Sakurai, Yukitomo Komura, Hirofumi Wada, Masayuki Shiga, Yoji Nakamura

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Powder X-ray diffraction measurements on intermetallic compounds RMna (R: Y, Pr, Nd, Sm and Gd) have been made in a temperature range from 69 to 300 K. Below Tn, every sample shows a large volume expansion, being as large as 4.6% for YMn2. In addition, PrMna and NdMn2 having the hexagonal C14 type of crystal structure are distorted into monoclinic below Tn- On the other hand, SmMn2 having the same C14 type structure is distorted into orthorhombic. On the basis of a theory of magnetoelastic coupling the directions of magnetization of these compounds below were determined. The cubic Cl5 type YMna shows a very small and probably rhombohedral distortion below Tn, whereas the same Cl 5 type GdMni shows no symmetry change.

Original languageEnglish
Pages (from-to)591-597
Number of pages7
Journaljournal of the physical society of japan
Volume54
Issue number2
DOIs
Publication statusPublished - Jan 1 1985
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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