Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 14: Postersitzung III (Neue u. unkonventionelle Supraleiter, Anwendungen der Supraleitung, Dünne Schichten, JJs und SQUIDs, Schwere Fermionen, Kondo-Systeme)

TT 14.47: Poster

Mittwoch, 26. März 2003, 14:30–19:00, P2c

Heat Capacity of Ce₂RhIn₈ under hydrostatic pressure — •E. Lengyel¹, J.L. Sarrao², G. Sparn¹, F. Steglich¹, and J.D. Thompson² — ¹Max-Planck-Institute for the Chemical Physics of Solids, Nöthnitzerstr. 40, 01187 Dresden, Germany — ²Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.

Ce₂RhIn₈ belongs to the Ce_nM_mIn_3n+2m family of materials, where M is a transition metal (Co, Rh or Ir). It crystallizes in the tetragonal Ho₂CoGa₈ structure and can be described as a layered structure along c-axis, consisting in alternating bi-layers of CeIn₃ separated by a layer of RhIn₂ [1]. All three members of the Ce_nRhIn_3n+2 family (CeIn₃ (n=∞), Ce₂RhIn₈ (n=2), CeRhIn₅ (n=1)) are heavy-fermion antiferromagnets at ambient pressure and become superconductors at higher pressures. Ce₂RhIn₈ has a Néel temperature of T_N = 3 K at ambient pressure. At p = 1.1 GPa it shows a superconducting transition at T_c = 0.38 K which then shifts to higher temperatures at even higher pressures [2]. Here we present heat capacity measurements under hydrostatic pressure (p ≤ 1.6 GPa) of Ce₂RhIn₈ and discuss the results in light of current theories on Quantum Critical Point phenomena and purely electronic coupling mechanisms.

[1] C. Petrovic, R. Movshovich, M. Jaime, P. G. Pagliuso, M. F. Hundley, J. L. Sarrao, Z. Fisk and J. D. Thompson, Europhys. Lett., 53 (3), pp.354-359 (2001)

[2] M. Nicklas, V. A. Sidorov, H. A. Borges, P. G. Pagliuso, C. Petrovic, Z. Fisk, J. L. Sarrao and J. D. Thompson, cond-mat/0204064