Giant Negative Magnetoresistance in GdI2: Prediction and Realization

✍ Scribed by C. Felser; K. Ahn; R.K. Kremer; R. Seshadri; A. Simon

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 247 KB
• Volume: 147
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8274

✦ Synopsis

The electronic structure of the layered d 1 compound GdI 2 has been examined systematically in view of its relation to other layered d 1 systems including superconducting and isostructural 2H-TaS 2 and 2H-NbSe 2 . A van Hove type instability is evident in suitable representations of the Fermi surface. The presence of the half-5lled and magnetic 4f level should preclude the possibility of superconductivity. Instead GdI 2 orders ferromagnetically at 290(5) K and displays large negative magnetoresistance +70% at 7 T close to room temperature. This 5nding provides support to the idea that materials can be searched rationally for interesting properties through high level electronic structure calculations.