Elastic properties of CeRu2

Abstract

We present data of the elastic properties of the Laves phase compound CeRu2 in the normal and superconchtcting state obtained from ultrasound measurements. In the temperature range between the superconducting transition temperature of 6.1 K and 300 K we used a deJormation potential coupling approach to describe the temperature dependence oJ" the elastic constants. The elastic anomalies in the superconducting state are characterised with the model of thermally assisted Jlux flow ( TAFF). This enables us to construct a detailed superconducting B-T phase diagram inchtding the vortex dynamics and interpret the peak effect region. Especially the ultrasonic measurements exhibit clearly the connection between the normal state and the superconducting properties. They show that structural fluctuations have strong effects on the superconductivity and on the vortex dynamics.

Interesting normal state and superconducting properties of the intermediate valence compound CeRu2

“…It should be mentioned here that a fairly recent study of the elastic properties of CeRu ¾ showed that the bulk modulus and the Poisson ratio had normal temperature dependence which in turn implied absence of any mixed valency effects [33]. It should also be mentioned here that there exists a study of X-ray absorption spectroscopy in hydrogenated samples of CeRu ¾ which advocates the key role played by the hybridization of the Ce-4 states with other extended states, namely Ce(5 ) and Ru(4 ) in determining the physical properties of CeRu ¾ [19].…”

“…It is conjectured that a new phase is induced by pressure around 0.5 GPa. A recent study of elastic properties of CeRu ¾ has also suggested that CeRu ¾ is close to a cubic-tetragonal structural phase transition [33]. In (Ce ½ Ü La Ü )Ru ¾ the phase with a negative pressure derivative of Ì (as in pure CeRu ¾ ) is…”

“…Elastic properties of CeRu ¾ have been studied by Wolf et al [33] and Suzuki et al [34] from room temperature down to 1 K. The elastic modulus (C ½½ C ½¾ )/2 continues to decrease with decreasing temperature down to 18.2 K, reaches a minimum and finally approaches a small constant value at low temperatures. Between 300 K and low temperatures the decrease in lattice stiffness for this mode is about 55%.…”

INVESTIGATION OF SUPERCONDUCTING GAP IN CeRu2

“…First of all it was caused by the hysteresis effects in magnetization [1,2], elastic properties [3], mixed-state fluxflow resistance and critical current density [4, S] in magnetic field. Different models were proposed to explain anomalies in these and other properties.…”

Strong hydrogen-related electronic effects on the shear elastic constant ofTaV2H(D)xFoster1, Hightower2, Leisure3 et al. 2002Phys. Rev. B9050View full textAdd to dashboardCite

“…8 The elastic constants of the Laves-phase compounds have been the subject of a large number of theoretical [9][10][11] and experimental investigations. [12][13][14][15][16][17][18] There is a vast number of binary (AB 2 ) Laves-phase intermetallic compounds 19 which form with three different symmetries: the C15 cubic, the C14 hexagonal, and the C36 structures. The elastic properties of the Laves phases have created interest for a variety of reasons.…”