Lattice Dynamics and Transport Properties of Multiferroic DyMn₂O₅

Table 1

Phonon-fit parameters of the infrared reflectivity spectrum of at room temperature and calculated modes [6] for comparison. The wavenumbers are given in cm⁻¹. 18 observed modes: , .

						Assignment
151(204)	0.20	9.29	95	104	117	Relative motion of Mn polyhedra and Dy ions
167(226)	0.28	8.51	170	176	—
194(262)	0.11	15.4	189	184	—
217(294)	0.02	4.46	208	—	—	Relative motion of Dy ions and oxygens
251(341)	0.05	4.73	—	231	245
260(352)	0.22	18.3	—	283	—	Mn-O bending motions in Mn octahedra
291(395)	0.01	10.8	310	—	—
327(443)	0.05	9.7	336	339	325	Mn-O twisting motions in Mn polyhedra
371(503)	0.27	27.3	382	387	368
402(544)	0.10	12.72	403	—	—
433(586)	0.12	27.46	—	441	456
462(626)	0.10	18.08	475	464	473	Mn-O bending motions within equatorial Mn planes in Mn octahedra
484(655)	0.20	18.25	486	475	—
511(692)	0.01	7.15	—	—	509
534(723)	0.16	17.31	567	576	—	Mn-O stretching motions in Mn octahedra and Mn square pyramids
565(765)	0.23	36.58	585	589	—
628(850)	0.08	23.22	617	626	655
684(926)	0.02	32.57	762	728	—