摘要
利用低温高压电阻原位测量装置（自箝铍青铜活塞-圆筒式压砧），在0～1．05GPa静水压力范围内，对以层状钙钛矿结构为主相、名义成分为La1.0 Ca2.0 Mn2O7 的锰氧化物样品进行了压阻效应研究。实验观测到异常的压阻效应。在低温5～150K范围内，压力为0．55GPa时，样品呈现出高达40％的压阻效应，而且，金属-绝缘体相变温度在低压范围内随压力的增加而增加，但随着压力的进一步增加而减小。
Pressure effects on electrical properties of a manganate with nominal composition La1.0 Ca2.0 Mn2O7, which has a layered perovskite structure as majority phase,have been investigated under hydrostatic pressures up to 1.05 GPa by using a self-clamped CuBe piston-cylinder cell. An abnormal pressure effect was observed. At a pressure of 0.55 GPa,a large pressure resistance effect of ≈40% was observed in a lower temperature range of 5～150 K. Besides,it is found that the metal-insulator transition temperature increases at low pressure but deceases with further loading pressure.
出处
《高压物理学报》
CAS
CSCD
北大核心
2006年第3期230-236,共7页
Chinese Journal of High Pressure Physics
基金
NationalNaturalScienceFoundationofChina(102740995032110150332020)
StateKeyDevel-opmentProgramforBasicResearchofChina(2002CB613301)
关键词
层状钙钛矿结构锰氧化物
电阻率
压阻效应
layered perovskite manganate
electrical resistivity
pressure resistance effect
