VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Spectroscopic and magnetic investigations of the dilute magnetically doped semiconductors ▫$BaSn_{1-x}Mn_xO_3 (0.02 \leq x \leq 0.1)$▫
    Sarkar, Ankita ; Dalal, Biswajit ; De, Subodh Kumar
    Dilute magnetically doped semiconductors (DMSs) are key to fabricating novel spintronic devices with high functionalities, which could be utilized for the next-generation technological development. ... BaSnO3 is a transparent wide band gap (~3.1 eV) semiconductor, in which magnetism can be induced through a subtle amount of magnetic impurity doping without deterring its optical transparency. In this work, we report an experimental investigation on the optical spectroscopic and magnetic properties of the DMSs BaSn1-xMnxO3 (0 ≤ x ≤ 0.1), synthesized using standard solid-state-reaction method at high-temperature and ambient pressure, through various spectroscopic, electron paramagnetic resonance (EPR) and temperature- and field-dependent magnetization measurements. All samples are found to be crystallize in the cubic structure with space group Pm3[bar] m, in which Mn ions are stabilized in the 4+ valence state. We find that the optical band gap monotonically decreases (from 3.1 eV to 2.08 eV) with increase in Mn doping concentration, which in turn leads to an increase in absorption efficiency in the visible region. An enhanced sp-d hybridization between localized d electrons of Mn ions and band electrons is likely the main reason for such band gap reduction. Interestingly, theoretical simulation of EPR spectra suggests that the signal is primarily arising from a combination of two spin systems, i.e., Mn4+ ions and singly ionized oxygen vacancies. The strength of magnetic interaction between Mn4+ ions is also increased for higher doped samples. Moreover, the nature of magnetic interaction is predominantly antiferromagnetic in higher doped samples, as corroborated by the negative value of Curie-Weiss temperature from the inverse susceptibility fitting.
    Vir: Journal of physics and chemistry of solids. - ISSN 1879-2553 (Vol. 170, [article no.] 110942, Nov. 2022, str. 1-8)
    Vrsta gradiva - e-članek ; neleposlovje za odrasle
    Leto - 2022
    Jezik - angleški
    COBISS.SI-ID - 141736195

    Povezava(-e):

    https://www.sciencedirect.com/science/article/pii/S0022369722003663?via%3Dihub
    DOI

Vnos na polico