Record Details

Magnetic properties of Mn-doped Ge-46 and Ba8Ge46 clathrates

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Magnetic properties of Mn-doped Ge-46 and Ba8Ge46 clathrates
 
Creator GANGULI, N
SHANAVAS, KV
DASGUPTA, I
 
Subject ELECTRONIC-STRUCTURE
GERMANIUM CLATHRATE
FERROMAGNETISM
 
Description We present a detailed study of the magnetic properties of unique cluster assembled solids, namely Mn-doped Ge-46 and Ba8Ge46 clathrates using density functional theory. We find that ferromagnetic ground states may be realized in both compounds when doped with Mn. In Mn2Ge44, ferromagnetism is driven by hybridization-induced negative exchange splitting, a generic mechanism operating in many diluted magnetic semiconductors. However, for Mn-doped Ba8Ge46 clathrates incorporation of conduction electrons via Ba encapsulation results in RKKY-like magnetic interactions between the Mn ions. We show that our results are consistent with the major experimental observations for this system.
 
Publisher IOP PUBLISHING LTD
 
Date 2014-10-16T13:53:11Z
2014-10-16T13:53:11Z
2012
 
Type Article
 
Identifier JOURNAL OF PHYSICS-CONDENSED MATTER, 24(50)
0953-8984
1361-648X
http://dx.doi.org/10.1088/0953-8984/24/50/505501
http://dspace.library.iitb.ac.in/jspui/handle/100/15715
 
Language en