NEUTRON-SCATTERING AND X-RAY-SCATTERING STUDY OF THE 2 LENGTH SCALES IN THE CRITICAL FLUCTUATIONS OF SRTIO3

被引:59
作者
HIROTA, K
HILL, JP
SHAPIRO, SM
SHIRANE, G
FUJII, Y
机构
[1] BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973
[2] UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,TOKYO 106,JAPAN
来源
PHYSICAL REVIEW B | 1995年 / 52卷 / 18期
关键词
D O I
10.1103/PhysRevB.52.13195
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Combined high-resolution neutron and x-ray diffraction experiments have been performed on several differently prepared single crystals of SrTiO3 in order to investigate the two length scales present near the cubic-to-tetragonal phase transition occurring at T-c similar to 100 K. The x-ray measurements show that the narrow component (long-length scale) exists in all crystals. However, the broad component (short-length scale) is sample dependent and unobservable in some crystals. The neutron experiments, which probe the entire sample volume, reveal that the narrow component is present only in thinly sliced samples (thickness < 1 mm), whereas bulk samples show only the broad component. In the thinly sliced samples, the broad component is not observed. These results lead to the conclusion that the narrow component is located in the near surface, or ''skin,'' region of the crystal and the size of the skin is sample dependent. By using the energy analysis capabilities of the neutron experiment we could separate the soft mode from the elastic central peak and found that the intensity of the central component is sample dependent, which is consistent with theories relating the origin of the central component to defects.
引用
收藏
页码:13195 / 13205
页数:11
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