Structural and magnetic studies on GeSe2-Se (Fe) dilute magnetic semiconductors

B. ARCONDO; M. A. UREÑA; M. ERAZÚ; J. A. ROCCA; M. FONTANA

Buenos Aires, Argentina

Congreso; At the Frontiers of the Condensed Matter III; 2006

Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica

<!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-GB;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> Fe0.005 (Ge0.25Se0.75)0.995 melt quenched samples have been obtained and analyzed by different techniques. Their structure was characterized by X-ray diffraction. Samples result partially crystalline with traces of Se and GeSe2. The magnetic behavior was characterized employing a SQUID magnetometer. DC magnetization was measured as a function of temperature and magnetic field from 5K to 300K. Witness Fe0.005 (GeSe2)0.995 and Fe0.005Se0.995 were also measured evidencing ferromagnetic behavior. The presence of Fe was utilized as a probe to study the short range order of the structure by means of Mössbauer spectroscopy and to corroborate the magnetic characterization.