title: Paramagnetic magnetization signals and curious metastable behaviour in field-cooled magnetization of a single crystal of superconductor 2H-NbSe2.
abstract: We present here some newer characteristics pertaining to paramagnetic Meissner effect like response in a single crystal of the low [Formula: see text] superconducting compound 2H-[Formula: see text] via a detailed study of effects of perturbation on the field-cooled magnetization response. In the temperature range, where an anomalous paramagnetic magnetization occurs, the field-cooled magnetization response is found to be highly metastable: it displays a curious tendency to switch randomly from a given paramagnetic value to a diamagnetic or to a different paramagnetic value, when the system is perturbed by an impulse of an externally applied ac magnetic field. The new facets revealed in a single crystal of 2H-[Formula: see text] surprisingly bear a marked resemblance with the characteristics of magnetization behaviour anticipated for the giant vortex states with multiple flux quanta ([Formula: see text], [Formula: see text], [Formula: see text]) predicted to occur in mesoscopic-sized superconducting specimen and possible transitions amongst such states.
authors.affiliation: Department of Physics, Indian Institute of Technology Bombay, Mumbai 400076, India.
authors.forename: Santosh
authors.initials: S
authors.lastname: Kumar
authors.forename: C V
authors.initials: CV
authors.lastname: Tomy
authors.forename: G
authors.initials: G
authors.lastname: Balakrishnan
authors.forename: D McK
authors.initials: DM
authors.lastname: Paul
authors.forename: A K
authors.initials: AK
authors.lastname: Grover