Large resistivity modulation in mixed-phase metallic systems

被引：172

作者：

Lee, Yeonbae ^{[1
]}

Liu, Z. Q. ^{[2
]}

Heron, J. T. ^{[3
]}

Clarkson, J. D. ^{[1
]}

Hong, J. ^{[4
]}

Ko, C. ^{[1
]}

Biegalski, M. D. ^{[2
]}

Aschauer, U. ^{[5
]}

Hsu, S. L. ^{[1
]}

Nowakowski, M. E. ^{[4
]}

Wu, J. ^{[1
,6
]}

Christen, H. M. ^{[2
]}

Salahuddin, S. ^{[4
]}

Bokor, J. B. ^{[4
,6
]}

Spaldin, N. A. ^{[5
]}

Schlom, D. G. ^{[3
,7
]}

Ramesh, R. ^{[1
,6
,8
,9
]}

机构：

[1] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[2] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

[3] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA

[4] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA

[5] ETH, CH-8093 Zurich, Switzerland

[6] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[7] Kavli Inst Cornell Nanoscale Sci, Ithaca, NY 14853 USA

[8] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[9] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

NATURE COMMUNICATIONS | 2015年 / 6卷

关键词：

INITIO MOLECULAR-DYNAMICS; TOTAL-ENERGY CALCULATIONS; TRANSITION; STRAIN; ELECTRORESISTANCE; MAGNETORESISTANCE; TEMPERATURE; SEPARATION;

D O I：

10.1038/ncomms6959

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

In numerous systems, giant physical responses have been discovered when two phases coexist; for example, near a phase transition. An intermetallic FeRh system undergoes a first-order antiferromagnetic to ferromagnetic transition above room temperature and shows two-phase coexistence near the transition. Here we have investigated the effect of an electric field to FeRh/PMN-PT heterostructures and report 8% change in the electrical resistivity of FeRh films. Such a 'giant' electroresistance (GER) response is striking in metallic systems, in which external electric fields are screened, and thus only weakly influence the carrier concentrations and mobilities. We show that our FeRh films comprise coexisting ferromagnetic and antiferromagnetic phases with different resistivities and the origin of the GER effect is the strain-mediated change in their relative proportions. The observed behaviour is reminiscent of colossal magnetoresistance in perovskite manganites and illustrates the role of mixed-phase coexistence in achieving large changes in physical properties with low-energy external perturbation.

引用

页数：7

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