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Title: Investigations of the R 5(Si xGe 1-x) 4 Intermetallic Compounds by X-Ray Resonant Magnetic Scattering

Abstract

The XRMS experiment on the Gd 5Ge 4 system has shown that, below the Neel temperature, T N = 127 K, the magnetic unit cells is the same as the chemical unit cell. From azimuth scans and the Q dependence of the magnetic scattering, all three Gd sites in the structure were determined to be in the same magnetic space group Pnma. The magnetic moments are aligned along the c-axis and the c-components of the magnetic moments at the three different sites are equal. The ferromagnetic slabs are stacked antiferromagnetically along the b-direction. They found an unusual order parameter curve in Gd 5Ge 4. A spin-reorientation transition is a possibility in Gd 5Ge 4, which is similar to the Tb 5Ge 4 case. Tb 5Ge 4 possesses the same Sm 5Ge 4-type crystallographic structure and the same magnetic space group as Gd 5Ge 4 does. The difference in magnetic structure is that Tb 5Ge 4 has a canted one but Gd 5Ge 4 has nearly a collinear one in the low temperature antiferromagnetic phase. The competition between the magneto-crystalline anisotropy and the nearest-neighbor magnetic exchange interactions may allow a 3-dimensional canted antiferromagnetic structure in Tb 5Ge 4. The spin-reorientation transitionmore » in both Gd 5Ge 4 and Tb 5Ge 4 may arise from the competition between the magnetic anisotropy from the spin-orbit coupling of the conduction electrons and the dipolar interactions anisotropy.« less

Authors:
 [1]
  1. Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
939380
Report Number(s):
IS-T 2427
TRN: US0806786
DOE Contract Number:  
AC02-07CH11358
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; ELECTRONS; EXCHANGE INTERACTIONS; INTERMETALLIC COMPOUNDS; MAGNETIC MOMENTS; NEEL TEMPERATURE; ORDER PARAMETERS; SCATTERING; SPACE GROUPS

Citation Formats

Tan, Lizhi. Investigations of the R5(SixGe1-x)4 Intermetallic Compounds by X-Ray Resonant Magnetic Scattering. United States: N. p., 2008. Web. doi:10.2172/939380.
Tan, Lizhi. Investigations of the R5(SixGe1-x)4 Intermetallic Compounds by X-Ray Resonant Magnetic Scattering. United States. doi:10.2172/939380.
Tan, Lizhi. Mon . "Investigations of the R5(SixGe1-x)4 Intermetallic Compounds by X-Ray Resonant Magnetic Scattering". United States. doi:10.2172/939380. https://www.osti.gov/servlets/purl/939380.
@article{osti_939380,
title = {Investigations of the R5(SixGe1-x)4 Intermetallic Compounds by X-Ray Resonant Magnetic Scattering},
author = {Tan, Lizhi},
abstractNote = {The XRMS experiment on the Gd5Ge4 system has shown that, below the Neel temperature, TN = 127 K, the magnetic unit cells is the same as the chemical unit cell. From azimuth scans and the Q dependence of the magnetic scattering, all three Gd sites in the structure were determined to be in the same magnetic space group Pnma. The magnetic moments are aligned along the c-axis and the c-components of the magnetic moments at the three different sites are equal. The ferromagnetic slabs are stacked antiferromagnetically along the b-direction. They found an unusual order parameter curve in Gd5Ge4. A spin-reorientation transition is a possibility in Gd5Ge4, which is similar to the Tb5Ge4 case. Tb5Ge4 possesses the same Sm5Ge4-type crystallographic structure and the same magnetic space group as Gd5Ge4 does. The difference in magnetic structure is that Tb5Ge4 has a canted one but Gd5Ge4 has nearly a collinear one in the low temperature antiferromagnetic phase. The competition between the magneto-crystalline anisotropy and the nearest-neighbor magnetic exchange interactions may allow a 3-dimensional canted antiferromagnetic structure in Tb5Ge4. The spin-reorientation transition in both Gd5Ge4 and Tb5Ge4 may arise from the competition between the magnetic anisotropy from the spin-orbit coupling of the conduction electrons and the dipolar interactions anisotropy.},
doi = {10.2172/939380},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {8}
}

Thesis/Dissertation:
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