You need JavaScript to view this

Alloying effects of Kondo insulators

Technical Report:

Abstract

The effects of nonmagnetic impurities (Kondo holes) in Kondo insulators (KI) are studied which is based on the U = {infinity} Anderson model in the framework of a slave-boson mean-field theory under the coherent-potential approximation (CPA). The density of states for f-electrons and its variation with the concentration of Kondo holes are calculated self-consistently. The specific-heat coefficient, residual resistivity, and the T = 0 static susceptibility in the alloying system are obtained. The results show that the insulating gap in KI can easily be smeared out by Kondo holes, and the system changes gradually from an insulator to a heavy-fermion metal with increasing concentration, which is in qualitative agreement with experiments. Furthermore, the appearance of an impurity band in the gap comes out naturally in the dilute limit of our CPA calculations. (author). 28 refs, 6 figs.
Authors:
Chengchung, Lee; [1]  Wang, Xu; Chun, Chen; Mingwen, Xiao [2] 
  1. International Centre for Theoretical Physics, Trieste (Italy)
  2. Nanjing Univ., Nanjing (China). Dept. of Physics
Publication Date:
Sep 01, 1994
Product Type:
Technical Report
Report Number:
IC-94/286
Reference Number:
SCA: 665000; PA: AIX-26:013832; EDB-95:032863; SN: 95001325631
Resource Relation:
Other Information: PBD: Sep 1994
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; KONDO EFFECT; MEAN-FIELD THEORY; BAND THEORY; DOPED MATERIALS; ELECTRIC CONDUCTIVITY; ELECTRICAL INSULATORS; ENERGY-LEVEL DENSITY; HOLES; MAGNETIC SUSCEPTIBILITY; SPECIFIC HEAT; 665000; PHYSICS OF CONDENSED MATTER
OSTI ID:
10112932
Research Organizations:
International Centre for Theoretical Physics (ICTP), Trieste (Italy)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ON: DE95614308; TRN: XA9438403013832
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
28 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Chengchung, Lee, Wang, Xu, Chun, Chen, and Mingwen, Xiao. Alloying effects of Kondo insulators. IAEA: N. p., 1994. Web.
Chengchung, Lee, Wang, Xu, Chun, Chen, & Mingwen, Xiao. Alloying effects of Kondo insulators. IAEA.
Chengchung, Lee, Wang, Xu, Chun, Chen, and Mingwen, Xiao. 1994. "Alloying effects of Kondo insulators." IAEA.
@misc{etde_10112932,
title = {Alloying effects of Kondo insulators}
author = {Chengchung, Lee, Wang, Xu, Chun, Chen, and Mingwen, Xiao}
abstractNote = {The effects of nonmagnetic impurities (Kondo holes) in Kondo insulators (KI) are studied which is based on the U = {infinity} Anderson model in the framework of a slave-boson mean-field theory under the coherent-potential approximation (CPA). The density of states for f-electrons and its variation with the concentration of Kondo holes are calculated self-consistently. The specific-heat coefficient, residual resistivity, and the T = 0 static susceptibility in the alloying system are obtained. The results show that the insulating gap in KI can easily be smeared out by Kondo holes, and the system changes gradually from an insulator to a heavy-fermion metal with increasing concentration, which is in qualitative agreement with experiments. Furthermore, the appearance of an impurity band in the gap comes out naturally in the dilute limit of our CPA calculations. (author). 28 refs, 6 figs.}
place = {IAEA}
year = {1994}
month = {Sep}
}