Neutron diffraction study of the magnetic structures of CeMn{sub 2}Ge{sub 2} and CeMn{sub 2}Si{sub 2}

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.362317· OSTI ID:280051

Fernandez-Baca, J A ^[1]; Hill, P ^[2]; Chakoumakos, B C ^[1]; Ali, N ^[2]

---

1. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)
2. Department of Physics, Southern Illinois University, Carbondale, Illinois 62901 (United States)

We have performed high-resolution neutron powder diffraction measurements on CeMn{sub 2}Si{sub 2} and CeMn{sub 2}Ge{sub 2} at temperatures between 12 and 550 K. Our measurements indicate that at high temperatures both compounds are paramagnetic. Below {ital T}{sub {ital N}}=380 K CeMn{sub 2}Si{sub 2} becomes a collinear AF, with a structure similar to that reported by Siek {ital et} {ital al}. in which the magnetic propagation vector is {tau}=(0 0 1). CeMn{sub 2}Ge{sub 2}, on the other hand, exhibits two different magnetic transitions. At {ital T}{sub {ital N}}{approx_equal}415 K there is a transition to a collinear AF phase characterized by the commensurate propagation wave vector {tau}=(1 0 1). At {ital T}{sub {ital C}}{approx_equal}318 K there is a transition to a conical structure with a ferromagnetic component along the {ital c} axis and a helical component in the {ital ab} plane. The helical component is characterized by the incommensurate propagation vector {tau}=(1 0 1{minus}{ital q}{sub {ital z}}), where {ital q}{sub {ital z}} is temperature dependent. {copyright} {ital 1996 American Institute of Physics.}

• Research Organization: Oak Ridge National Laboratory
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 280051
• Report Number(s): CONF-951101--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 79; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM COMPOUNDS
GERMANIUM COMPOUNDS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIC STRUCTURE
MANGANESE COMPOUNDS
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
SILICON COMPOUNDS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K