Substantial pressure effects on the electrical resistivity and ferromagnetic transition temperature of La1-xCaxMnO3.
Substantial pressure effects on the electrical resistivity and ferromagnetic transition temperature of La1-xCaxMnO3.
复制标题
高压对 La1-xCaxMnO3 的电阻率和铁磁转变温度的影响。
DOI：
--
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Heffner
中科院分区：
文献类型：
--
作者：
Neumeier;Hundley;Thompson;Heffner
给出了当静水压力分别为0.21、0.33和0.40时，静水压力对La{sub1{-}{italx}}Ca{subitalx}}MnO{sub3}的电阻率和铁磁转变温度的影响。压力强烈地降低了{Rho}，并以高达+37K/Gpa的速率驱动了{italx}=0.21样品的{italT}{subitalc}}；这明显大于在常规铁磁体中观察到的{italdt}{sub{italc}}/{italdp}值，比在Ca{sub1{-}{italx}}sr{sub{italx}}MnO{sub3}反铁磁体中观察到的{italdt}{subitalN}/{italdp}大约8倍。这些氧化物的输运机制在性质上受压力和磁场的影响。在涉及磁极化子传导的双交换相互作用的框架下对结果进行了解释。
The influence of hydrostatic pressure on the electrical resistivity {rho} and ferromagnetic transition temperature {ital T}{sub {ital c}} of La{sub 1{minus}{ital x}}Ca{sub {ital x}}MnO{sub 3} is presented for {ital x}=0.21, 0.33, and 0.40. Pressure strongly decreases {rho} and drives {ital T}{sub {ital c}} up at rates as large as +37 K/GPa for the {ital x}=0.21 specimen; this is significantly larger than {ital dT}{sub {ital c}}/{ital dP} values observed in conventional ferromagnets and about eight times larger than {ital dT}{sub {ital N}}/{ital dP} observed in Ca{sub 1{minus}{ital x}}Sr{sub {ital x}}MnO{sub 3} antiferromagnets. The transport mechanism in these oxides is influenced in a qualitatively similar way by both pressure and magnetic field. The results are interpreted in the framework of the double-exchange interaction involving conduction via magnetic polarons.