Low-Temperature Structural Phase Transition in Monoclinic RbDy(WO4)2 Crystal

M.T. Borowieca, V. Dyakonovb, V. Kamenevb, A. Nabiałeka, A. Prokhorovb, H. Szymczaka and M. Załęskia aInstitute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland bA.A. Galkin Donetsk Physico-Technical Institute, Ukrainian Academy of Sciences, 340114 Donetsk, Ukraine

Received: April 29, 1998; in final form July 9, 1998

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The ESR spectrum of Dy3+ ion in the low-symmetry RbDy(WO4)2 crystal has been studied in the temperature region of T=4.2 ÷ 30K. The ESR linewidth was found to increase from 130 mT up to the maximum value of 190 mT at T=9K and then to decrease down to 150 mT at 4.2K. The components of the g-tensor change considerably without change of their spatial orientation in the temperature range from 12K to 7 K: gz=2.5, gx≈0, gy=1.41 at T>12 K; gz=1.53, gx≈0, gy=1.2 at T<7K. The observed λ-shaped behaviour of absorption linewidth and the decrease in the g-factor are assumed to be due to the low-temperature structural phase transition (TSPT≈9 K). The width of the transition area is of about 5K. It is suggested that the symmetry of high- and low-temperature phases is identical.

DOI: 10.12693/APhysPolA.94.71 PACS numbers: 76.30.-v, 75.20.-g