Optical absorption of EuTe in high magnetic fields

• Published in: Solid state communications Vol. 28; no. 8; pp. 597 - 600
• Main Authors: Schmutz, L.E., Dresselhaus, G., Dresselhaus, M.S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.1978
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/0038-1098(78)90588-4

For the first time, the optical absorption edge of the magnetic semiconductor europium telluride has been studied at low temperature (1.7 K) as a function of magnetic field in the high field range 0 ≤ H ≤ 9.5 Tesla, and related to the magnetic phase diagram of this material. The exponential absorption edge has been parameterized using a magnetic field dependent extension of Urbach's rule, and the observations are found to be consistent with a simple dependence of the gap parameter on polarization and magnetic field.