Barely metallic states with enhanced carrier mass in Y1-xCaxTiO3.
Barely metallic states with enhanced carrier mass in Y1-xCaxTiO3.
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Y1-xCaxTiO3 中载流子质量增强的几乎金属态。
DOI：
10.1103/physrevb.48.14063
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Iye
中科院分区：
文献类型：
--
作者：
Tokura;Taguchi;Moritomo;Kumagai;Suzuki;Iye
在名义上的空穴掺杂Mott绝缘体系统Y1-xCaxTiO3中，金属-绝缘体的转变发生在x=0.4附近。在金属-绝缘体相界面附近观察到了电阻率的热滞行为。加压有利于抑制准重入相(金属-绝缘体-金属)转变，稳定金属相。霍尔系数和电子比热的测量表明，在x=0.4时，稀有金属相的特征是载流子质量的增加，而不是载流子密度的降低
In the nominally hole-doped Mott insulator system Y 1-x Ca x TiO 3 , the metal-insulator transition takes place near x=0.4. A thermal hysteretic behavior of the resistivity is observed in the immediate vicinity of the metal-insulator phase boundary. Application of pressure tends to suppress the quasireentrant (metal-insulator-metal) transition and to stabilize the metallic phase. Measurements of the Hall coefficient and the electronic specific heat indicate that the barely metallic phase at about x=0.4 is characterized by an enhancement of carrier mass rather than by a reduction of carrier density