Regensburg 1998 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 21: Postersitzung III: Spin-Peierls-Systeme, Metall-Isolator-Übergang, Lokalisierung; SL: Theorie; Quantenflüssigkeiten und -kristalle; Amorphe Materialien, Tunnelsysteme; Borcarbide, Fullerene, konventionelle SL; SL dünner Filme; Experimentiertechniken

TT 21.30: Poster

Donnerstag, 26. März 1998, 15:00–18:30, D

Low Temperature Resistivity of CeIn₃ near the Border of Magnetic and Superconducting Order at High Pressure — •M.J. Steiner, I.R. Walker, F.M. Grosche, D. Freye, and G.G. Lonzarich — Cavendish Laboratory, University of Cambridge, England

The antiferromagnetic inter-metallic compound CeI₃ exhibits a superconducting phase at the boundary between the antiferromagnetic and paramagnetic phase at pressures of 24.1 kbar and temperatures below 200 mK. At temperatures well below the Néel temperature, the resistivity behaves as T³ as expected from scattering from antiferromagnons. At temperatures below approximately 10 K for pressures about 30 kbar, the resistivity varies as T² in agreement with scattering due to antiferromagnetic spin fluctuations in a Fermi liquid state well away from the critical pressure where the Néel temperature is suppressed to zero. Near the critical pressure, however, the resistivity exponent remains well below the Fermi liquid value of 2 over a wide range below 10 K. We have studied in detail the resistivity of a pure sample of CeIn₃ showing no separate phase of elementary Indium in the range from room to low temperatures at varying pressures to extract the form of the resistivity exponent in the vicinity of the critical pressure.