skip to main content

Title: Homogeneous limit of Cd{sub 1−x}Mn{sub x}GeAs{sub 2} alloy: Electrical and magnetic properties

We present the studies of structural, electrical, and magnetic properties of bulk Cd{sub 1−x}Mn{sub x}GeAs{sub 2} crystals with low Mn content, x, varying from 0 to 0.037. The studied samples have excellent crystallographic quality indicated by the presence of diffraction patterns never before observed experimentally for this compound. The electrical transport in our samples is dominated by thermal activation of conducting holes from the impurity states to the valence band with activation energy of about 200 meV. The defect states acting as ionic scattering centers with concentration in the range from 6 to 15 × 10{sup 17} cm{sup −3} are observed. The effective Mn content in our samples, x{sup ¯}{sub θ}, determined from fit of the susceptibility data to the Curie-Weiss law, is very close to the average chemical content, x. It indicates that the Mn ions are distributed randomly, substituting the Cd sites in the host CdGeAs{sub 2} lattice. We observe a negative Curie-Weiss temperature, |θ|≤3.1 K, increasing as a function of x. This indicates the significance of the short-range interactions between the Mn ions.
Authors:
; ; ; ; ;  [1] ; ;  [2]
  1. Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw (Poland)
  2. Kurnakov Institute of General and Inorganic Chemistry RAS, 119991 Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
22273657
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACTIVATION ENERGY; CADMIUM COMPOUNDS; CONCENTRATION RATIO; CRYSTALS; CURIE-WEISS LAW; DIFFRACTION; ELECTRIC CONDUCTIVITY; GERMANIUM ARSENIDES; HOLES; MAGNETIC PROPERTIES; MANGANESE COMPOUNDS; MANGANESE IONS; VALENCE