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Abstract:
We present an extended B-T phase diagram for CeCu2Si2. Elastic
constants, ultrasonic attenuation and thermal expansion measurements map
besides superconductivity three phases, whose origin is unknown yet. The
superconducting phase is embedded in these new phases, which severely
constrain the symmetry of the superconducting order parameter. The
superconductivity is strongly influenced by Cu deficiencies in contrast
to the other phases.