Giant Negative Temperature Coefficient of Resistance and Magnetotransport in Antiferromagnetic CaMnO3

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成果类型：

期刊论文

作者：

Wang, Haochen;Lu, Gefei;Tan, Weishi;Li, Junran;Su, Kunpeng;...

通讯作者：

Wang, Haiou;Su, KP;Tan, WS

作者机构：

[Lu, Gefei; Su, Kunpeng; Wang, Haiou; Su, KP; Yang, Lin; Huang, Shuai; Li, Junran; Wang, Haochen] Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Key Lab Novel Mat Sensor Zhejiang Prov, Hangzhou 310018, Peoples R China.

[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key Lab Hunan Prov, Yiyang 413002, Peoples R China.

[Tan, Weishi] Nanjing Univ Sci & Technol, Key Lab Soft Chem & Funct Mat, Minist Educ, Dept Appl Phys, Nanjing 210094, Peoples R China.

通讯机构：

[Su, KP ; Wang, HO; Tan, WS ] H

Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Key Lab Novel Mat Sensor Zhejiang Prov, Hangzhou 310018, Peoples R China.

Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key Lab Hunan Prov, Yiyang 413002, Peoples R China.

Nanjing Univ Sci & Technol, Key Lab Soft Chem & Funct Mat, Minist Educ, Dept Appl Phys, Nanjing 210094, Peoples R China.

语种：

英文

关键词：

Temperature coefficient of resistance;Transport properties;Magnetoresistance;Antiferromagnetic insulator;Manganites

期刊：

Journal of Low Temperature Physics

ISSN：

0022-2291

年：

2025

页码：

1-22

DOI：

10.1007/s10909-025-03312-4

基金类别：

National Natural Science Foundation of China [U23A20549, 11604067, U1832143]; National Natural Science Foundation of China

机构署名：

本校为通讯机构

院系归属：

信息与电子工程学院

摘要：

CaMnO3, a perovskite manganite known for its antiferromagnetic (AFM) and other physical properties, has underexplored transport properties and temperature coefficient of resistance (TCR). We report exceptional charge transport phenomena in orthorhombic CaMnO3, revealing a record negative temperature coefficient of resistance (TCR = - 31.8% K(-)1 at 21 K) for antiferromagnetic insulators. Magnetic characterization shows a N & eacute;el temperature (TN) of 81.5 K. This magnetic transition govern distinct charge transport regimes, variable-range hopping (VRH) below TN and small polaron (SP) condu...

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Giant Negative Temperature Coefficient of Resistance and Magnetotransport in Antiferromagnetic CaMnO3

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