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ID 30707
file
creator
Ye, Mao
Miura, Yoshio
Shirai, Masafumi
Cui, Yi-tao
Ueda, Shigenori
Kobayashi, Keisuke
Kainuma, Ryosuke
Shishido, Toetsu
Fukushima, K
Kanomata, Takeshi
NDC
Physics
abstract
We have revealed the underlying mechanism of the martensitic phase transition (MPT) in a new class of ferromagnetic shape memory alloys, Ni2Mn1+xSn1-x, by the combination of bulk-sensitive hard-x-ray photoelectron spectroscopy and a first-principles density-functional calculation. The Ni 3d eg state in the cubic phase systematically shifts towards the Fermi energy with an increase in the number of Mn atoms substituted in the Sn sites. An abrupt decrease of the intensity of the Ni 3d eg states upon MPT for x=0.36–0.42 has been observed in the vicinity of the Fermi level. The energy shift of the Ni 3d minority-spin eg state in the cubic phase originates from hybridization with the antiferromagnetically coupled Mn in the Sn site. Below the MPT temperature, the Ni 3d state splits into two levels located below and above the Fermi energy in order to achieve an energetically stable state.
journal title
Physical Review Letters
volume
Volume 104
issue
Issue 17
start page
176401-1
end page
176401-4
date of issued
2010-04-26
publisher
The American Physical Society
issn
0031-9007
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2010 The American Physical Society
relation url
department
Graduate School of Science