[Zurück]

U. Köhler, R. Demchyna, S. Paschen, U. Schwarz, F. Steglich:
"Schottky anomaly in the low-temperature specific heat of Ba_8-xEu_xGe₄₃υ₃";
Physica B: Condensed Matter, 378-380 (2006), S. 263 - 264.

Schottky anomaly in the low-temperature specific heat of Ba_8-xEu_xGe₄₃υ₃

U. Köhler, a, R. Demchyna a, S. Paschen a, U. Schwarz a and F. Steglich a

a Max Planck Institute for Chemical Physics of Solids, Dresden D-01187, Germany

Abstract

The low-temperature specific heat c_p of the recently synthesized defect clathrate series Ba_8-xEu_xGe₄₃υ₃ (x=0.3,0.6) strongly depends on the Eu content x. c_p/T vs. temperature T shows an upturn below 5 K, the intensity of which has previously been shown to increase with x. From investigation of cp in magnetic fields up to 9 T in the temperature range from 30 to 350 mK we conclude that this upturn is caused by a Schottky contribution from the Eu²⁺ ground state octet that is split due to the crystal electric field and the magnetic field on the Eu site.

Keywords: Clathrate; Specific heat; Schottky anomaly

Clathrate; Specific heat; Schottky anomaly

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588174

http://dx.doi.org/10.1016/j.physb.2006.01.097