skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Intrinsic Nanostructure in Zr 2-xFe 4Si 16-y(x=0.81, y=6.06)

Abstract

We present a study of the crystal structure and physical properties of single crystals of a new Fe-based ternary compound, Zr 2-xFe 4Si 16-y(x=0.81,y=6.06). Zr 1.19Fe 4Si 9.94 is a layered compound, where stoichiometric β-FeSi 2-derived slabs are separated by Zr-Si planes with substantial numbers of vacancies. High resolution transmission electron microscopy (HRTEM) experiments show that these Zr-Si layers consist of 3.5nm domains where the Zrand Si vacancies are ordered within a supercell sixteen times the volume of the stoichiometric cell. Within these domains, the occupancies of the Zr and Si sites obey symmetry rules that permit only certain compositions, none of which by themselves reproduce the average composition found in x-ray diffraction experiments. Magnetic susceptibility and magnetization measurements reveal a small but appreciable number of magnetic moments that remain freely fluctuating to 1.8K, while neutron diffraction confirms the absence of bulk magnetic order with a moment of 0.2μB or larger down to 1.5K. Electrical resistivity measurements find that Zr 1.19Fe 4Si 9.94 is metallic, and the modest value of the Sommerfeld coefficient of the specific heat γ = C/T suggests that quasi-particle masses are not particularly strongly enhanced. The onset of superconductivity at T c ≃ 6K results inmore » a partial resistive transition and a small Meissner signal, although a bulk-like transition is found in the specific heat. Sharp peaks in the ac susceptibility signal the interplay of the normal skin depth and the London penetration depth, typical of a system in which nano-sized superconducting grains are separated by a on-superconducting host. Ultra low field differential magnetic susceptibility measurements reveal the presence of a surprisingly large number of trace magnetic and superconducting phases, suggesting that the Zr-Fe-Si ternary system could be a potentially rich source of new bulk superconductor.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3];  [3];  [4];  [3];  [2];  [1]
  1. Stony Brook University
  2. Brookhaven National Laboratory
  3. Ames Laboratory
  4. Oak Ridge National Laboratory
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1166735
Report Number(s):
IS-J 8457
Journal ID: ISSN 0953-8984
DOE Contract Number:  
DE-AC02-07CH11358
Resource Type:
Journal Article
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 26; Journal Issue: 37; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; nano-grains, magnetism, heterogeneity

Citation Formats

Smith, G J, Simonson, J W, Orvis, T, Marques, C, Grose, J E, Kistner-Morris, J J, Wu, L, Cho, Kyuil, Kim, Hyong june, Tanatar, Makariy A, Garlea, V O, Prozorov, Ruslan, Zhu, Y, and Aronson, M C. Intrinsic Nanostructure in Zr2-xFe4Si16-y(x=0.81, y=6.06). United States: N. p., 2014. Web. doi:10.1088/0953-8984/26/37/376002.
Smith, G J, Simonson, J W, Orvis, T, Marques, C, Grose, J E, Kistner-Morris, J J, Wu, L, Cho, Kyuil, Kim, Hyong june, Tanatar, Makariy A, Garlea, V O, Prozorov, Ruslan, Zhu, Y, & Aronson, M C. Intrinsic Nanostructure in Zr2-xFe4Si16-y(x=0.81, y=6.06). United States. doi:10.1088/0953-8984/26/37/376002.
Smith, G J, Simonson, J W, Orvis, T, Marques, C, Grose, J E, Kistner-Morris, J J, Wu, L, Cho, Kyuil, Kim, Hyong june, Tanatar, Makariy A, Garlea, V O, Prozorov, Ruslan, Zhu, Y, and Aronson, M C. Wed . "Intrinsic Nanostructure in Zr2-xFe4Si16-y(x=0.81, y=6.06)". United States. doi:10.1088/0953-8984/26/37/376002.
@article{osti_1166735,
title = {Intrinsic Nanostructure in Zr2-xFe4Si16-y(x=0.81, y=6.06)},
author = {Smith, G J and Simonson, J W and Orvis, T and Marques, C and Grose, J E and Kistner-Morris, J J and Wu, L and Cho, Kyuil and Kim, Hyong june and Tanatar, Makariy A and Garlea, V O and Prozorov, Ruslan and Zhu, Y and Aronson, M C},
abstractNote = {We present a study of the crystal structure and physical properties of single crystals of a new Fe-based ternary compound, Zr2-xFe4Si16-y(x=0.81,y=6.06). Zr1.19Fe4Si9.94 is a layered compound, where stoichiometric β-FeSi2-derived slabs are separated by Zr-Si planes with substantial numbers of vacancies. High resolution transmission electron microscopy (HRTEM) experiments show that these Zr-Si layers consist of 3.5nm domains where the Zrand Si vacancies are ordered within a supercell sixteen times the volume of the stoichiometric cell. Within these domains, the occupancies of the Zr and Si sites obey symmetry rules that permit only certain compositions, none of which by themselves reproduce the average composition found in x-ray diffraction experiments. Magnetic susceptibility and magnetization measurements reveal a small but appreciable number of magnetic moments that remain freely fluctuating to 1.8K, while neutron diffraction confirms the absence of bulk magnetic order with a moment of 0.2μB or larger down to 1.5K. Electrical resistivity measurements find that Zr1.19Fe4Si9.94 is metallic, and the modest value of the Sommerfeld coefficient of the specific heat γ = C/T suggests that quasi-particle masses are not particularly strongly enhanced. The onset of superconductivity at Tc ≃ 6K results in a partial resistive transition and a small Meissner signal, although a bulk-like transition is found in the specific heat. Sharp peaks in the ac susceptibility signal the interplay of the normal skin depth and the London penetration depth, typical of a system in which nano-sized superconducting grains are separated by a on-superconducting host. Ultra low field differential magnetic susceptibility measurements reveal the presence of a surprisingly large number of trace magnetic and superconducting phases, suggesting that the Zr-Fe-Si ternary system could be a potentially rich source of new bulk superconductor.},
doi = {10.1088/0953-8984/26/37/376002},
journal = {Journal of Physics. Condensed Matter},
issn = {0953-8984},
number = 37,
volume = 26,
place = {United States},
year = {2014},
month = {9}
}