Crossover from large to small polarons across the metal-insulator transition in manganites

被引：202

作者：

Lanzara, A

Saini, NL

Brunelli, M

Natali, F

Bianconi, A

Radaelli, PG

Cheong, SW

机构：

[1] Univ Rome La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[2] Univ Rome La Sapienza, Unita INFM, I-00185 Rome, Italy

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[4] AT&T Bell Labs, Lucent Technol Inc, Murray Hill, NJ 07974 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.81.878

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report Mn K-edge extended x-ray absorption fine structure spectra on La0.75Ca0.25MnO3 up to high momentum transfer across the metal-insulator (M-I) transition. The data show compelling evidence for (i) large, or intermediate Jahn-Teller polarons (IJTP), characterized by an anomalous longer Mn-O bond (Delta R = 0.09 Angstrom) in the metallic phase (T < 170 K), and (ii) appearance of small JT polarons (SJTP) at T > 170 K, characterized by a longer Mn-O bond (Delta R = 0.21 Angstrom), which coexist with the IJTP above the M-I transition and has equal probability in the temperature range of colossal magnetoresistance.

引用

页码：878 / 881

页数：4

共 28 条

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