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

doi:10.1143/JPSJ.54.591

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 journal › Article › peer-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 language	English
Pages (from-to)	591-597
Number of pages	7
Journal	journal of the physical society of japan
Volume	54
Issue number	2
DOIs	https://doi.org/10.1143/JPSJ.54.591
Publication status	Published - Jan 1 1985
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1143/JPSJ.54.591

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

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.",

author = "Yukiharu Tagawa and Junji Sakurai and Yukitomo Komura and Hirofumi Wada and Masayuki Shiga and Yoji Nakamura",

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T2 - Y, Pr, Nd, Sm and Gd)

AU - Tagawa, Yukiharu

AU - Sakurai, Junji

AU - Komura, Yukitomo

AU - Wada, Hirofumi

AU - Shiga, Masayuki

AU - Nakamura, Yoji

PY - 1985/1/1

Y1 - 1985/1/1

N2 - 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.

AB - 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.

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

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