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S. Gabáni, E. Bauer, St Berger, K. Flachbart, Y. Paderno, C. Paul, V. Pavlik, N. Shitsevalova:
"Pressure-induced Fermi-liquid behavior in the Kondo insulator SmB6: Possible transition through a quantum critical point";
Physical Review B, 67 (2003), S. 172406-1 - 172406-4.

Pressure-induced Fermi-liquid behavior in the Kondo insulator SmB6: Possible transition through a quantum critical point

S. Gabáni,1,2 E. Bauer,2 S. Berger,2 K. Flachbart,1 Y. Paderno,3 C. Paul,2 V. Pavlík,1 and N. Shitsevalova3 1Institute of Experimental Physics, Slovak Academy of Sciences, SK-04353 Ko [s] ice, Slovakia
2Institut für Festkörperphysik, Technische Universität Wien, A-1040 Wien, Austria
3Institute for Problems of Materials Science, UA-252680 Kiev, Ukraine

(Received 17 December 2002; published 19 May 2003)

We have investigated the electrical resistivity of the intermediate valence narrow-gap semiconductor SmB6 at temperatures below 80 K and under pressure in the range between 1 bar and 70 kbar. We report on a continuous suppression of the gap under pressure, and on the observation of a critical point at pcr [[approximate]] 40 kbar, characterizing the pressure induced transition from a Kondo insulator below pcr to a metallic heavy fermion liquid well above pcr. In the metallic phase close to pcr strong indications for a non-Fermi-liquid region, in which the electrical resistivity can be described by a power law [rho] (T) = [rho] 0 + ATn with 1 [<=] n [<=] 2, were observed. ©2003 The American Physical Society

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04405840

http://link.aps.org/abstract/PRB/v67/e172406