Thermal, Electrical and Magnetic Properties of the Ferromagnetic Dense Kondo System CeSi_x

Suppression of ferromagnetism inCeSi1.81under temperature and pressure

“…At magnetic fields H c1 = 30 kOe and H c2 = 47 kOe anomalous behavior was observed, where measurements of the magneto-caloric effect for magnetic field along the a-axis was interpreted as providing a weak antiferromagnetic modulation. Later Sato et al 25 also reported measurements of the specific heat C V (T ), electrical resistivity ρ(T ) and magnetic susceptibility χ(T ) of two CeSi x single crystals grown by an inductive floating zone method with the same Si concentrations. To determine the Si content, the specific heat was compared with results for polycrystalline samples.…”

CeSi2−δ single crystals: growth features and properties

“…Several authors have accomplished indirect concentration estimates of Ce-Si crystals by comparison of low-temperature specific heat data or lattice parameters with polycrystalline samples of given composition [1,2]. In spite of the transition from tetragonal to orthorhombic structure with enhanced Si-deficiency the unit cell volume of CeSi x monotonically increases with rising x [3].…”

“…But despite more than 20 years of intense research, rare earth silicides still have not been fully understood. The origin of magnetic order in Ce compounds traditionally is attributed to a strong competition between single-site Kondo screening and RKKY interactions [1][2][3]. Only a few Ce compounds are known to exhibit ferromagnetic order.…”

“…A key characteristic of CeSi x is a strong anisotropy of the magnetic properties [2,19]. This highlights the need for high-quality single crystals in studies of the nature of the magnetic order.…”

“…Several attempts have been reported to grow CeSi x single crystals. CeSi 1.70-1.71 and CeSi 1.86 single crystals were grown by a Floating Zone (FZ) technique [2,20] and a Czochralski (CZ) technique in a Hukin-type cold crucible [1]. The primary constraint of the past studies is that, grown crystals compositions were only estimated indirectly by comparing the low-temperature electronic specific heat coefficients g with those of polycrystalline samples of a given composition [9].…”