Spin-assisted photoluminescence of polycrystalline α-MnSe

• Published in: Journal of luminescence Vol. 128; no. 1; pp. 142 - 146
• Main Authors: POPOVIC, Z. V, MILUTINOVIC, A, ROMCEVIC, N
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 2008; Elsevier
• Subjects: Antiferromagnetics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other solid inorganic materials; Phase transition; Photoluminescence; Physics; Superexchange interaction; α-MnSe; Superexchange interaction; Photoluminescence; 75.50.Ee; 78.55.−m; Antiferromagnetics; α-MnSe; 75.30.Kz; 75.30.Et; Phase transition; Manganese selenides; Superexchange interactions; Polycrystals; Paramagnetic-antiferromagnetic transitions; Excited states; Antiferromagnetics; Phase transition; α-MnSe; Photoluminescence; Superexchange interaction; 75.50.Ee; 75.30.Kz; 78.55.-m; 75.30.Et
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2007.06.004

We have studied photoluminescence of α-MnSe in the antiferromagnetic and paramagnetic phases. Two broad, possibly multi-component emission bands centred at about 1.53 and 1.66
eV are observed at 20
K. The frequencies and intensities of these bands show step-like shift in the vicinity of
T
N. On the basis of difference in peak energies at
T=1.8
K and
T
N the d–p–d superexchange interaction in excited state is estimated to be
J
2g(exc)=0.918
meV.