Premium
Electron paramagnetic resonance and electron‐nuclear double resonance study of Mn 2+ ions in CdGeAs 2 crystals
Author(s) -
Evans S. M.,
Garces N. Y.,
DeMattei R. C.,
Feigelson R. S.,
Zawilski K. T.,
Giles N. C.,
Halliburton L. E.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200541162
Subject(s) - hyperfine structure , electron paramagnetic resonance , ion , tetragonal crystal system , electron nuclear double resonance , chemistry , resonance (particle physics) , electron , atomic physics , nuclear magnetic resonance , electron shell , analytical chemistry (journal) , paramagnetism , crystal (programming language) , materials science , crystal structure , crystallography , physics , condensed matter physics , ionization , organic chemistry , quantum mechanics , chromatography , computer science , programming language
Electron paramagnetic resonance (EPR) and electron‐nuclear double resonance (ENDOR) have been used to characterize Mn 2+ (3d 5 ) ions in CdGeAs 2 crystals grown by the horizontal Bridgman method. These samples were p‐type with room‐temperature hole concentrations ranging from 2 × 10 15 cm –3 to 5 × 10 16 cm –3 . The Mn 2+ ions substitute for the Cd 2+ ions in this tetragonal chalcopyrite lattice, and form “deep” isoelectronic centers. Their g values and crystal‐field parameters are g ‖ = 2.0025, g ⊥ = 2.0011, D = 118.8 MHz, a + 2/3 F = 18.4 MHz, and a = –0.3 MHz. The hyperfine and nuclear electric quadrupole parameters for the 55 Mn nucleus are A ‖ = –154.94 MHz, A ⊥ = –155.69 MHz, and P = 0.622 MHz. Hyperfine parameters for one set of nearby Cd nuclei and two sets of nearby As nuclei were also determined using ENDOR. No evidence was found in these doped bulk crystals to suggest that Mn 4+ ions substitute for Ge 4+ ions. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)