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Electronic Structure of La(Fe0.88Si0.12)13

Published online by Cambridge University Press:  01 February 2011

Nozomu Kamakura ,
Tetsuo Okane ,
Yukiharu Takeda ,
Shin-ichi Fujimori ,
Yuji Saitoh ,
Hiroshi Yamagami ,
Atsushi Fujimori ,
Asaya Fujita ,
Shun Fujieda  and
Kazuaki Fukamichi
Nozomu Kamakura
Affiliation:
[email protected], Japan Atomic Energy Agency, Synchrotron Radiation Research Center, Hyogo, Japan
Tetsuo Okane
Affiliation:
[email protected], Japan Atomic Energy Agency, Synchrotron Radiation Research Center, Hyogo, Japan
Yukiharu Takeda
Affiliation:
[email protected], Japan Atomic Energy Agency, Synchrotron Radiation Research Center, Hyogo, Japan
Shin-ichi Fujimori
Affiliation:
[email protected], Japan Atomic Energy Agency, Synchrotron Radiation Research Center, Hyogo, Japan
Yuji Saitoh
Affiliation:
[email protected], Japan Atomic Energy Agency, Synchrotron Radiation Research Center, Hyogo, Japan
Hiroshi Yamagami
Affiliation:
[email protected], Japan Atomic Energy Agency, Synchrotron Radiation Research Center, Hyogo, Japan
Atsushi Fujimori
Affiliation:
[email protected], Japan Atomic Energy Agency, Synchrotron Radiation Research Center, Hyogo, Japan
Asaya Fujita
Affiliation:
[email protected], Tohoku University, Department of Materials Science, Graduate School of Engineering, Sendai, Japan
Shun Fujieda
Affiliation:
[email protected], Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Sendai, Japan
Kazuaki Fukamichi
Affiliation:
[email protected], Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Sendai, Japan
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Abstract

La(Fe0.88Si0.12)13 shows peculiar magnetic properties such as the first order paramagnetic-ferromagnetic transition and magnetic-field induced metamagnetic transition accompanied by the lattice expansion. The practical application using the magnetic transition temperature controlled by hydrogen absorption is expected in this compound. Here, the electronic structure of La(Fe0.88Si0.12)13 has been investigated by photoemission spectroscopy using synchrotron soft x-rays. The Fe 3s core-level photoemission spectra below and above the Curie temperature TC exhibit a satellite structure at ~ 4.3 eV higher binding energy than the main peak, which is attributed to the exchange splitting due to the local moment of Fe. The exchange splitting of the Fe 3s photoemission spectrum with the asymmetric line shape shows that the magnetization of La(Fe0.88Si0.12)13 is derived by the exchange split Fe 3d bands like the itinerant ferromagnetism in Fe metal, while the magnetic transition of La(Fe0.88Si0.12)13 is the first order. The valence band photoemission spectrum shows temperature dependence across the TC. The temperature dependence of the photoemission spectra is discussed based on the difference between the electronic structure in the ferromagnetic phase and that in the paramagnetic phase.

Keywords

photoemissionelectronic structureferromagnetic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1262: Symposium V/W – In-Situ and operando Probing of Energy Materials at Multiscale Down to Single Atomic Couumn-The Powerof X-Rays, Neutons and Electrons Microscopy , 2010 , 1262-W06-03
Copyright
Copyright © Materials Research Society 2010

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