Large tunability driven by low electric field in oxygen-isotope-exchanged strontium titanate at cryogenic temperatures
Large tunability driven by low electric field in oxygen-isotope-exchanged strontium titanate at cryogenic temperatures
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低温下氧同位素交换钛酸锶中低电场驱动的大可调性
DOI：
10.1063/1.1471572
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发表时间：
2002
影响因子：
4
通讯作者：
M. Itoh
中科院分区：
文献类型：
--
作者：
Ruiping Wang;M. Itoh
重同位素18O替代SrTiO 3中的16O同时导致在低温下的可调谐性的显著增强和驱动电场的大幅度降低。对于36%的氧同位素交换SrTiO 3在2 K，驱动电场的可调性为0.82是约半个订单低于未交换的。可调谐性和优值可以通过氧同位素交换速率来定制。认为这一现象与铁电微区的出现和系统中的"畴态"密切相关[R。Wang和M. Itoh，Phys.Rev.B 62，R731（2000）]。
The substitution of heavy isotope 18O for 16O in SrTiO3 simultaneously results in a significant enhancement of tunability and a large reduction of driving electric fields at cryogenic temperatures. For a 36% oxygen isotope exchanged SrTiO3 at 2 K, the driving electric field for the tunability of 0.82 is about half an order lower than that for an unexchanged one. The tunability and the figure of merit could be tailored by the oxygen isotope exchange rate. It is considered that the phenomena are closely related to the appearance of ferroelectric microregions and the “domain state” in this system [R. Wang and M. Itoh, Phys. Rev. B 62, R731 (2000)].