Magnetism and Phase Formation in the Candidate Dilute Magnetic Semiconductor System In_(2-x)Cr_xO_3: Bulk Materials are Dilute Paramagnets

摘要

Well-characterized bulk materials in the candidate dilute magnetic semiconductor system In_(2-x)Cr_xO_3 are prepared for 0 ≤ x ＜ 0.15, with cation site preferences in the bixbyite structure identified by diffraction methods. Small ferromagnetic moments are observed; their size ( ＜ 10~(-2) μ_B/dopant ion) is not consistent with bulk ferromagnetism. The resulting bulk materials display dilute paramagnetic behaviour, with all of the moment expected per Cr_(3+) cation dopant being involved in this paramagnetic response.