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Title: Helical antiferromagnetic ordering in Lu1-xScxMnSi

Abstract

Polycrystalline samples of Lu 1-xSc xMnSi (x=0, 0.25, 0.5) are studied using powder x-ray diffraction, heat capacity Cp, magnetization, magnetic susceptibility χ, and electrical resistivity ρ measurements versus temperature T and magnetic field H. This system crystallizes in the primitive orthorhombic TiNiSi-type structure (space group Pnma) as previously reported. The ρ(T) data indicate metallic behavior. The Cp(T), χ(T), and ρ(T) measurements consistently indicate long-range antiferromagnetic (AF) transitions with AF ordering temperatures TN=246, 215, and 188 K for x=0, 0.25, and 0.5, respectively. A second transition is observed at somewhat lower T for each sample from the χ(T) and ρ(T) measurements, which we speculate are due to spin reorientation transitions; these second transitions are completely suppressed in H=5.5 T. The Cp data below 10 K for each composition indicate an enhanced Sommerfeld electronic heat capacity coefficient for the series in the range γ=24–29 mJ/mol K2. The χ(T) measurements up to 1000 K were fitted by local-moment Curie-Weiss behaviors which indicate a low Mn spin S~1. The χ data below TN are analyzed using the Weiss molecular field theory for a planar noncollinear cycloidal AF structure with a composition-dependent pitch, following the previous neutron diffraction work of Venturini et al. [J. Alloysmore » Compd. 256, 65 (1997)]. Within this model, the fits indicate a turn angle between Mn ordered moments along the cycloid axis of ~100° or ~145°, either of which indicate dominant AF interactions between the Mn spins in the Lu 1-xSc xMnSi series of compounds.« less

Authors:
 [1];  [1];  [1]
  1. Ames Laboratory
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1166782
Report Number(s):
IS-J 8467
Journal ID: ISSN 1098-0121; PRBMDO; ArticleNumber: 064415
DOE Contract Number:  
DE-AC02-07CH11358
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 90; Journal Issue: 6
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Goetsch, Ryan J, Anand, V K, and Johnston, David C. Helical antiferromagnetic ordering in Lu1-xScxMnSi. United States: N. p., 2014. Web. doi:10.1103/PhysRevB.90.064415.
Goetsch, Ryan J, Anand, V K, & Johnston, David C. Helical antiferromagnetic ordering in Lu1-xScxMnSi. United States. doi:10.1103/PhysRevB.90.064415.
Goetsch, Ryan J, Anand, V K, and Johnston, David C. Fri . "Helical antiferromagnetic ordering in Lu1-xScxMnSi". United States. doi:10.1103/PhysRevB.90.064415.
@article{osti_1166782,
title = {Helical antiferromagnetic ordering in Lu1-xScxMnSi},
author = {Goetsch, Ryan J and Anand, V K and Johnston, David C},
abstractNote = {Polycrystalline samples of Lu1-xScxMnSi (x=0, 0.25, 0.5) are studied using powder x-ray diffraction, heat capacity Cp, magnetization, magnetic susceptibility χ, and electrical resistivity ρ measurements versus temperature T and magnetic field H. This system crystallizes in the primitive orthorhombic TiNiSi-type structure (space group Pnma) as previously reported. The ρ(T) data indicate metallic behavior. The Cp(T), χ(T), and ρ(T) measurements consistently indicate long-range antiferromagnetic (AF) transitions with AF ordering temperatures TN=246, 215, and 188 K for x=0, 0.25, and 0.5, respectively. A second transition is observed at somewhat lower T for each sample from the χ(T) and ρ(T) measurements, which we speculate are due to spin reorientation transitions; these second transitions are completely suppressed in H=5.5 T. The Cp data below 10 K for each composition indicate an enhanced Sommerfeld electronic heat capacity coefficient for the series in the range γ=24–29 mJ/mol K2. The χ(T) measurements up to 1000 K were fitted by local-moment Curie-Weiss behaviors which indicate a low Mn spin S~1. The χ data below TN are analyzed using the Weiss molecular field theory for a planar noncollinear cycloidal AF structure with a composition-dependent pitch, following the previous neutron diffraction work of Venturini et al. [J. Alloys Compd. 256, 65 (1997)]. Within this model, the fits indicate a turn angle between Mn ordered moments along the cycloid axis of ~100° or ~145°, either of which indicate dominant AF interactions between the Mn spins in the Lu1-xScxMnSi series of compounds.},
doi = {10.1103/PhysRevB.90.064415},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 6,
volume = 90,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2014},
month = {Fri Aug 01 00:00:00 EDT 2014}
}