Optical Response of DyN

We report measurements of the optical response of polycrystalline DyN thin films. The frequency-dependent complex refractive index in the near IR-visible-near UV was determined by fitting reflection/transmission spectra. In conjunction with resistivity measurements these identify DyN as a semiconductor with 1.2 eV optical gap. When doped by nitrogen vacancies it shows free carrier absorption and a blue-shifted gap associated with the Moss-Burstein effect. The refractive index of 2.0+/-0.1 depends only weakly on energy. Far infrared reflectivity data show a polar phonon of frequency 280 cm-1 and dielectric strength delta epsilon= 20.

[1]  H. Trodahl,et al.  Electric field and photo-excited control of the carrier concentration in GdN , 2013, 1302.5184.

[2]  M. Schilfgaarde,et al.  Electronic structure of EuN: Growth, spectroscopy, and theory , 2011 .

[3]  M. Blamire,et al.  Spin-filter Josephson junctions. , 2011, Nature materials.

[4]  O. Wada,et al.  Optical and magnetic properties in epitaxial GdN thin films , 2011 .

[5]  O. Wada,et al.  Optical and ferromagnetic properties of GdN thin films , 2011 .

[6]  T. Cheiwchanchamnangij,et al.  First-principles Study of Nitrogen Vacancies in GdN , 2011 .

[7]  Anand Sharma,et al.  Additional carrier-mediated ferromagnetism in GdN , 2010 .

[8]  S. M. Durbin,et al.  Growth and properties of epitaxial GdN , 2009 .

[9]  H. Trodahl,et al.  Vibrational properties of rare-earth nitrides: Raman spectra and theory , 2009 .

[10]  W. Lambrecht,et al.  Calculated interband optical transition spectra of GdN , 2008 .

[11]  H. Trodahl,et al.  Ferromagnetic redshift of the optical gap in GdN , 2007, 0705.2912.

[12]  H. Trodahl,et al.  Comparison between experiment and calculated band structures for DyN and SmN , 2007, cond-mat/0703740.

[13]  Walter R. L. Lambrecht,et al.  Electronic structure of rare-earth nitrides using the LSDA+U approach: Importance of allowing 4f orbitals to break the cubic crystal symmetry , 2007 .

[14]  H. Trodahl,et al.  Ferromagnetic resonance study of GdN thin films with bulk and extended lattice constants , 2006 .

[15]  H. Trodahl,et al.  Semiconducting ground state of GdN thin films , 2006 .

[16]  K. Fauth,et al.  GdN thin films: Bulk and local electronic and magnetic properties , 2005 .

[17]  V. Ivanov,et al.  Spintronics and spintronics materials , 2004 .

[18]  P. Strange,et al.  Half-metallic to insulating behavior of rare-earth nitrides , 2004 .

[19]  S. Pokrant,et al.  Magnetization curves of DyN clusters , 2001 .

[20]  J. Petzelt,et al.  FIR spectroscopic studies of ferroelectric films , 1998 .

[21]  K. Mattenberger,et al.  Chapter 114 Magnetic measurements on rare earth and actinide monopnictides and monochalcogenides , 1993 .

[22]  J. Dismukes,et al.  Vapor deposition of semiconducting mononitrides of Sc, Y, and the rare earth elements☆ , 1971 .

[23]  N. Sclar.  Properties of Rare‐Earth Nitrides , 1964 .