title: Pressure and temperature dependence of the chlorine NQR in caesium and sodium chlorates.
abstract: The (35)Cl nuclear quadrupole resonance (NQR) frequencies (nu(Q)) in caesium and sodium chlorates were measured as a function of temperature, from 77 to 300 K at different pressures up to 5.1 kbar, and the data were analysed to estimate the volume dependence of the electric field gradient (EFG), torsional frequency and also the contributions to the NQR frequency from static and dynamic effects. The variation of spin-lattice relaxation time with pressure at different temperatures was studied in the case of sodium chlorate and at room temperature in case of caesium chlorate. The pressure dependence of the spin-lattice relaxation time (T(1)) suggests that the relaxation is mainly due to the torsional motions.
authors.affiliation: Department of Physics, Indian Institute of Science, Bangalore 560 012, India. kpramesh@physics.iisc.ernet.in
authors.forename: K P
authors.initials: KP
authors.lastname: Ramesh
authors.forename: K S
authors.initials: KS
authors.lastname: Suresh
authors.forename: C
authors.initials: C
authors.lastname: Raghavendra Rao
authors.forename: J
authors.initials: J
authors.lastname: Ramakrishna