Urbach's tail in the absorption spectra of the ordered vacancy compound CuGa3Se5

Negami, 1995, Appl. Phys. Lett., 67, 825, 10.1063/1.115456 Kessler, 1993 Xiau, 1994, J. Appl. Phys., 76, 1502 Marı́n, 1998, Mater. Res. Bull., 33, 1057, 10.1016/S0025-5408(98)00078-6 Negami, 1994, Jpn. J. Appl. Phys., 33, L1251, 10.1143/JJAP.33.L1251 Contreras, 1996, Mater. Res. Soc. Symp. Proc., 426, 267, 10.1557/PROC-426-243 Stolt, 1993, Appl. Phys. Lett., 62, 597, 10.1063/1.108867 Rincón, 1998, Appl. Phys. Lett., 73, 441, 10.1063/1.121893 Marı́n, 1998, J. Appl. Phys., 83, 3364, 10.1063/1.367103 Marı́n, 1999, J. Alloys Comp., 283, 1, 10.1016/S0925-8388(98)00878-0 Manoogian, 1984, J. Phys., 62, 285 Wasim, 1998, J. Appl. Phys., 84, 5823, 10.1063/1.368851 Marı́n, 1997, J. Appl. Phys., 81, 7580, 10.1063/1.365302 Kurik, 1971, Phys. Status Solidi A, 8, 9, 10.1002/pssa.2210080102 Urbach, 1953, Phys. Rev., 92, 1324, 10.1103/PhysRev.92.1324 Martienssen, 1957, J. Phys. Chem. Solids, 2, 257, 10.1016/0022-3697(57)90070-7 Shioda, 1996, J. Appl. Phys., 80, 1106, 10.1063/1.362914 Wasim, 1998, J. Appl. Phys., 83, 3318, 10.1063/1.367100 Cody, 1981, Phys. Rev. Lett., 47, 1480, 10.1103/PhysRevLett.47.1480