11Th General Conf Of The Condensed Matter Division Of The European Physical Soc, Date: APR 08-11, 1991, Location: EXETER, ENGLAND, Sponsors: EUROPEAN PHY SOC, DIV CONDENSED MATTER, CITY EXETER, COHERENT, INST PHYS, DIV CONDENSED MATTER & MAT PHYS, DEVON AND CORNWELL DEV BUREAU, OXFORD INSTRUMENTS, ROYAL SOC, SOC PHOTO OPT INSTRUMENTAT ENGINEERS, TAYLOR & FRANCIS, UNIV EXETER