Minority-spin t_2g states and the degree of spin polarization in ferromagnetic metallic La_2-2xSr_1+2xMn₂O₇ (x=0.38)

2013/10/24 by Z. Sun, Zhengyi Sun, Q. Wang +31
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Electronic and Structural Properties of Oxides #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.1310.6476

arxiv created 2013/10/24 · openalex publication_date 2013/10/24 · arxiv updated 2013/10/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Using angle-resolved photoemission spectroscopy (ARPES), we investigate the electronic band structure and Fermi surface of ferromagnetic La_2-2xSr_1+2xMn₂O₇ (x=0.38). Besides the expected two hole pockets and one electron pocket of majority-spin e_g electrons, we show an extra electron pocket around the Γ point. A comparison with first-principles spin-polarized band-structure calculations shows that the extra electron pocket arises from t_2g electrons of minority-spin character, indicating this compound is not a complete half-metallic ferromagnet, with similar expectations for lightly-doped cubic manganites. However, our data suggest that a complete half-metallic state is likely to be reached as long as the bandwidth is mildly reduced. Moreover, the band-resolved capability of ARPES enables us to investigate the band structure effects on spin polarization for different experimental conditions.

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