期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.176401
关键词
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资金
- JSPS/MEXT [17340112, 19048002, 21560693]
- Cooperative Research Project of RIEC, Tohoku University
- Grants-in-Aid for Scientific Research [17340112, 19048002, 21560693] Funding Source: KAKEN
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 e(g) 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 e(g) 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 e(g) 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.
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