RAMAN-ACTIVE PHONONS OF THE SPIN-1 CHAIN ANTIFERROMAGNETS R2BANIO5 (R=GD AND Y)

被引：12
作者：
SULEWSKI, PE
CHEONG, SW
机构：
[1] ATandT Bell Laboratories, Murray Hill, NJ 07974-0636
来源：
PHYSICAL REVIEW B | 1994年 / 50卷 / 01期
关键词：
D O I：
10.1103/PhysRevB.50.551
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report Raman spectra of single-crystalline Gd2BaNiO5 and Y2BaNiO5, concentrating on identification and assignment of the phonons at room temperature. All nine of the expected Ramanactive phonons (3 A(g) + 1B1g + 2B2g + 3B3g) are observed. The three Gd(Y) related modes of B2g, A(g), and B3, symmetry are observed at 123(160), 175(233), and 204(269) cm-1, respectively. The six O(1) vibrational modes of the Gd(Y) compound occur at 183(184), 312(328), 335(340), 422(440), 518(540), and 562(584) cm-1, having B3g, B2g, B1g, B3g, A(g), and A(g) symmetries, respectively. A strong mode polarized along the Ni-O(2) chain axis at approximately 726(755) cm-1 in the Gd(Y) compound may arise from magnetic excitations along the spin chains or from a Raman-forbidden, infrared-allowed vibrational mode along the Ni-O(2) chains.
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页码：551 / 554
页数：4
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