A neutron study of the flux lattice in the superconductor CeRu2

Stepwise amorphization of the flux-line lattice inCa3Rh4Sn13Sarkar1, Pal2, Banerjee3 et al. 2000Phys. Rev. B314384View full textAdd to dashboardCite

“…In an earlier report, Banerjee et al 23 have exhibited the same kind of history dependence in CeRu 2 and 2H-NbSe 2 . Also, from the small-angle neutronscattering study, Huxley et al 31 have surmised that the FC state in CeRu 2 comprises more finely divided regions of correlated lattice as compared to those in the ZFC state. The difference in the ZFC and the FCW responses finally disappears at the peak position of the PE, somewhat akin to the magnetic responses in spin glasses where the ZFC and FC magnetization curves merge at the spin-glass transition temperature T g .…”

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

“…Softening of the AFL has also been predicted within a collective pinning model [81]. Such a picture of dynamical crossover in the pinning properties has been invoked by various groups [52,53] to understand the properties of CeRu ¾ . We must assert here that this explanation is indeed valid in the PE seen in many superconductors [71] but the anomalous characteristic features described above are not seen in those cases.…”

“…The well characterized polycrystalline sample originates from Los Alamos National Laboratory and has been used in the past in important neutron measurements as a control sample [63]. The single crystal sample has been obtained from CENG-Grenoble and originates from the same batch samples which have been used in various measurements including neutron scattering [17,52]. The present magnetization results are obtained using a commercial SQUID magnetometer (Quantum Design MPMS-5).…”

“…Our study, however, does not address to the question of the microscopic order parameter of this high-field higher entropy superconducting phase. While FFLO state (defined below) has been considered as a possible explanation for the anomalous superconducting properties of the high field phase of not only CeRu ¾ but also a few other type-II superconductors, namely UPd ¾ Al ¿ [21,47], UPt ¿ [100], CeCo ¾ [46,101] etc, there also exists serious reservations regarding the applicability of such an idea to CeRu ¾ [52,53]. In the light of such controversies it is worth discussing this subject in some more detail.…”

“…(This value of À È changes substantially in the presence of impurity spin-orbit scattering [50].) While it is still a matter of debate whether the À ¾ in CeRu ¾ is Pauli limited or not [21,[51][52][53], it certainly remains one of the first ordered intermetallic compounds to show paramagnetic mixed state.…”