M. Deppe

Non-Fermi Liquid States in the Pressurized CeCu2(Si1-xGex)2 System: Two Critical Points

In the archetypal strongly correlated electron superconductor CeCu2Si2 and its Ge-substituted alloys CeCu2(Si1-xGex)2 two quantum phase transitions--one magnetic and one of so far unknown origin-can be crossed as a function of pressure. We examine the associated anomalous normal state by detailed measurements of the low temperature resistivity (rho) power-law exponent alpha. At the lower critical point (at pcl, 1<or=alpha<or=1.5) alpha depends strongly on Ge concentration x and thereby on disorder level, consistent with a Hlubina-Rice-Rosch scenario of critical scattering off antiferromagnetic fluctuations. By contrast, alpha is independent of x at the upper quantum phase transition (at pc2, alpha approximately equal to 1), suggesting critical scattering from local or q=0 modes, in agreement with a density- or valence-fluctuation approach.

Experimental evidence for a generalized FFLO state in clean type-II superconductors with short coherence length and enhanced Pauli susceptibility

Abstract We report an investigation of the magnetic and dilatometric properties of single crystals of the superconductors UPd 2 Al 3 and CeRu 2 , both compounds exhibiting enhanced spin susceptibilities. Our results suggest for both systems a first-order transition between weak and strong pinning at T T c , somewhat below H c2 ( T ). We argue that these observations are compatible with a staggered order parameter due to the formation of a “generalized Fulde-Ferrell-Larkin-Ovchinnikov state”.

Low temperature magnetic phase diagram of the cubic non-Fermi liquid system CeIn \(\mathsf{_{3-x}}\)Sn\(\mathsf{_x}\)

Abstract.In this paper we report a comprehensive study of the magnetic susceptibility (

Non-Fermi-liquid behaviour close to the disappearance of ferromagnetism in CePd1?xRhx

\chi

Pronounced first-order metamagnetic transition in the paramagnetic heavy-fermion system CeTiGe

), resistivity (

Anomalous pinning in superconductors with strong Pauli paramagnetism

\rho

Thermoelectric Power of Correlated Compounds

), and specific heat (

Investigation of Yb2Pt6Al15 single crystals: heavy fermion system with a large local moment degeneracy

C_{\rm P}

Effect of impurity scattering on the superconductivity of CeCu2Si2

), down to 0.5 K of the cubic CeIn3-xSnx alloy. The ground state of this system evolves from antiferromagnetic (AF) in CeIn3 (

Crystal field excitations in CeCu2Ge2: Revisited employing a single crystal and inelastic neutron scattering

T_{\rm N} = 10.2