Berlin 2008 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 6: Correlated Electrons: Heavy Fermions
TT 6.3: Talk
Monday, February 25, 2008, 10:00–10:15, EB 202
Investigation of the magnetic and the superconducting states of CeCu2(Si1−xGex) using single crystals — •Hirale S Jeevan1, Takeshi Nakanishi1, Julia Arndt1, Enrico Faulhaber2, Oliver Stockert1, Micha Deppe1, Tomasz Cichorek1, Frank Steglich1, and Christoph Geibel1 — 1Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Gemany — 2TU Dresden, IAPD, D-01062 Dresden, Germany
The discovery of superconductivity in CeCu2Si2 in 1979 opened the field of unconventional superconductivity in strongly correlated systems. Later on, another unconventional phase, the A-phase, of magnetic character was found to compete with the superconducting phase in CeCu2Si2. Recent neutron experiment confirms that the A-phase is nothing but the long range antiferromagnetic order, spin density wave type due to nesting of heavy Fermi surface. And in pure CeCu2Si2 it was shown that the long range magnetic phase and superconducting phase compete each other. Here we investigate the magnetic and the superconducting states in a series of Ge substituted single crystals CeCu2(Si1−xGex) with x = 0.02 and 0.1. Ge substitution has two effect, stabilises the magnetic phase due to expansion of the lattice, but it also induce disorder effect. Based on the earlier results on polycrystalline samples, we expect the possible co-existing of both long range magnetic phase and superconducting phase in some Ge concentration range. We shell analyse and discuss the single crystal growth, physical properties and neutron scattering measurements of these Ge substituted single crystals.