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Title: The effects of Fe, Co, and Ni doping on the superconductivity and structure of HfV{sub 2}

Abstract

The temperature dependence of the specific heat has been measured for Fe-, Co-, and Ni-doped HfV{sub 2} systems. HfV{sub 2} undergoes a structural transformation at T{sub S}=116 K and becomes superconducting at T{sub C}=9 K. The low temperature specific heat of HfV{sub 2} shows an enhanced electronic specific heat coefficient indicating a large density of states at the Fermi level. T{sub C} shows nonmonotonic behavior with magnetic ion concentration. It increases initially as one dopes HfV{sub 2} with small amounts of Fe, Co, or Ni and reaches a maximum of 9.4 K for about 3.0 to 4.0 at. % doping and then decreases for higher concentrations. On the other hand, the specific heat data at higher temperatures show that both T{sub S} and the size of the specific heat anomaly at T{sub S} decrease monotonically and dramatically when the concentration of Fe, Co, or Ni is increased. No evidence of a structural transformation is detected for samples with more than 5 at. % Fe, Co, or Ni. The variations of T{sub C} and T{sub S} can be explained qualitatively by recent theoretical calculations. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [2]
  1. Department of Physics, Temple University, Philadelphia, Pennsylvania 19122 (United States)
  2. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
20216283
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SUPERCONDUCTIVITY; IRON; COBALT; NICKEL; CRYSTAL DOPING; LAVES PHASES; HAFNIUM COMPOUNDS; VANADIUM COMPOUNDS; SPECIFIC HEAT; PHASE TRANSFORMATIONS; EXPERIMENTAL DATA

Citation Formats

Lin, C. L., Yuen, Tan, Mihalisin, T., and Chu, F. The effects of Fe, Co, and Ni doping on the superconductivity and structure of HfV{sub 2}. United States: N. p., 2000. Web. doi:10.1063/1.372845.
Lin, C. L., Yuen, Tan, Mihalisin, T., & Chu, F. The effects of Fe, Co, and Ni doping on the superconductivity and structure of HfV{sub 2}. United States. doi:10.1063/1.372845.
Lin, C. L., Yuen, Tan, Mihalisin, T., and Chu, F. Mon . "The effects of Fe, Co, and Ni doping on the superconductivity and structure of HfV{sub 2}". United States. doi:10.1063/1.372845.
@article{osti_20216283,
title = {The effects of Fe, Co, and Ni doping on the superconductivity and structure of HfV{sub 2}},
author = {Lin, C. L. and Yuen, Tan and Mihalisin, T. and Chu, F.},
abstractNote = {The temperature dependence of the specific heat has been measured for Fe-, Co-, and Ni-doped HfV{sub 2} systems. HfV{sub 2} undergoes a structural transformation at T{sub S}=116 K and becomes superconducting at T{sub C}=9 K. The low temperature specific heat of HfV{sub 2} shows an enhanced electronic specific heat coefficient indicating a large density of states at the Fermi level. T{sub C} shows nonmonotonic behavior with magnetic ion concentration. It increases initially as one dopes HfV{sub 2} with small amounts of Fe, Co, or Ni and reaches a maximum of 9.4 K for about 3.0 to 4.0 at. % doping and then decreases for higher concentrations. On the other hand, the specific heat data at higher temperatures show that both T{sub S} and the size of the specific heat anomaly at T{sub S} decrease monotonically and dramatically when the concentration of Fe, Co, or Ni is increased. No evidence of a structural transformation is detected for samples with more than 5 at. % Fe, Co, or Ni. The variations of T{sub C} and T{sub S} can be explained qualitatively by recent theoretical calculations. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.372845},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}