[25p-71B-1~13] 10.4 半導体・トポロジカル・超伝導・強相関スピントロニクス

16:00 〜 16:15英語発表

[25p-71B-11] Enhancement of double-exchange interaction in a La_2/3Sr_1/3MnO₃ membrane released from epitaxial strain

〇Takahito Takeda¹, Takuma Arai¹, Kohei Yamagami², Le Duc Anh^1,3, Masaaki Tanaka^1,3,4, Masaki Kobayashi^1,3, Shinobu Ohya^1,3,4 (1.Dept of EEIS, The Univ. of Tokyo, 2.JASRI, 3.CSRN, The Univ. of Tokyo, 4.NanoQuine, The Univ. of Tokyo)

キーワード：

oxide、ferromagnet、synchrotron radiation spectroscopy

We have studied the mechanism of ferromagnetism enhancement in a La_2/3Sr_1/3MnO₃ (LSMO) membrane released from a SrTiO₃ (STO) substrate by using a water-dissolvable Sr₄Al₂O₇ buffer layer. The LSMO membrane exceeds the as-grown LSMO film in the magnetic moment and Curie temperature. By resonant photoemission spectroscopy (RPES) on the as-grown film and membrane of LSMO, we elucidate that the strain release from the STO substrate enhances the itineracy of the Mn 3d electrons via the p-d hybridization. The enhancement of the itineracy strengthens the double-exchange interaction, improving the ferromagnetism of LSMO.