Dresden 2003 – scientific programme
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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
Wednesday, March 26, 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 CenMmIn3n+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 CenRhIn3n+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 TN = 3 K at ambient pressure. At p = 1.1 GPa it shows a superconducting transition at Tc = 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