Heavy-fermion formation at the metal-to-insulator transition in Gd1-xSxTiO3 -: art. no. 193103

被引：17

作者：

Heinrich, M ^{[1
]}

von Nidda, HAK ^{[1
]}

Fritsch, V ^{[1
]}

Loidl, A ^{[1
]}

机构：

[1] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.63.193103

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The perovskitelike transition-metal oxide Gd1-xSrxTiO3 is investigated by measurements of resistivity, specific-heat, and electron paramagnetic resonance (EPR). Approaching the metal-to-insulator transition from the metallic regime (x greater than or equal to0.2), the Sommerfeld coefficient gamma of the specific heat becomes strongly enhanced and the resistivity increases quadratically at low temperatures. which both are fingerprints of strong electronic correlations. The temperature dependence of the dynamic susceptibility, as determined from the Gd3+-EPR linewidth, signals the importance of strong spin fluctuations. as observed in heavy-fermion compounds.

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