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Spin dependent distribution and Fermi surface of the perovskite manganite compound La 0.7 Sr 0.3 MnO 3 via 2D‐ACAR measurements
Author(s) -
Hamid A. S.,
Arima T.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301943
Subject(s) - fermi surface , condensed matter physics , physics , fermi level , spin (aerodynamics) , electron , annihilation , fermi gas , manganite , fermi gamma ray space telescope , perovskite (structure) , chemistry , ferromagnetism , superconductivity , nuclear physics , crystallography , thermodynamics
Using 2D angular correlation of positron annihilation radiation (ACAR) experiment, we have performed a systematic study of the spin dependent and Fermi surface of the colossal magneto‐resistance CMR La 0.7 Sr 0.3 MnO 3 . The measurements have been carried out using a re‐versal magnetic field direction (parallel and anti‐parallel to the direction of motion of the polarized posi‐trons). The measured spectra have been investigated in the momentum space as well as in the wave vector space. They revealed information about the hybridization effect of Mn(3d e g 1 ) and O(2 p ) like states. Further, the results showed that the majority spin electrons predominated at the Fermi level. From another perspective, the Fermi surface of La 0.7 Sr 0.3 MnO 3 revealed a cuboids hole surface centered on R point and a spheroid electron surface centered on Γ point. A comparison with the earlier results showed qualitative agreement. However, the current results could reveal the dimension of the electron surface centered on Γ point that was predicted in the earlier 2D‐ACAR measurements. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)