Magnetic field-induced charge-density-wave transitions: The role of the orbital and Pauli effects

✍ Scribed by M.V. Kartsovnik; D. Andres; W. Biberacher; H. Müller

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 403 KB
• Volume: 404
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2008.11.028

✦ Synopsis

Due to a low transition temperature and, correspondingly, a small energy gap, the charge-density-wave (CDW) state of the layered organic metal a-ðBEDT-TTFÞ 2 KHgðSCNÞ 4 is very sensitive to pressure and magnetic field. The latter couples to the CDW via two competing mechanisms: Pauli paramagnetism and orbital motion of charge carriers in a magnetic field. We study the interplay between the Pauli and orbital effects under a pressure of 2.8 kbar, in the region of the field-induced CDW (FICDW) instability. We find that, in agreement with theoretical predictions, the FICDW state is enhanced when the Zeeman splitting becomes commensurate with the orbital quantization.