Strain induced modulation of the correlated transport in epitaxial Sm0.5Nd0.5NiO3 thin films

Journal of Physics. Condensed Matter : an Institute of Physics Journal
L ZhangX Hong

Abstract

We report a study of the effect of epitaxial strain on the correlated transport properties of 2-40 nm Sm0.5Nd0.5NiO3 (SNNO) films grown on different substrates. The metal-insulator transition (MIT) temperature T(MI) of the SNNO films increases with increasing tensile strain. While films on (0 0 1) LaAlO3 and (1 1 0) NdGaO3 substrates exhibit a sharp MIT and thermal hysteresis in the cooling-heating cycle, signaling a first-order transition, films on (0 0 1) SrTiO3 show a broad, second-order MIT. Hall effect measurements reveal hole-type charge carriers and thermally activated temperature dependence of the carrier density below T(MI). The corresponding activation energy is ∼80 meV for films on LaAlO3 and NdGaO3, and is suppressed to 25 meV for films on SrTiO3. The carrier mobility in the metallic state and variable range hopping (VRH) transport at a low temperature point significantly enhanced electron localization in SNNO on STO, which we believe is not simply driven by extrinsic effects such as oxygen vacancies, but rather is an intrinsic characteristic for films subject to tensile strain due to the elongated Ni-O bond and hence enhanced dynamic Jahn-Teller distortion. In ultrathin films above the electrical dead layer thickne...Continue Reading

References

Oct 1, 1995·Physical Review. B, Condensed Matter·M MedardeK Gobrecht
Oct 4, 2000·Physical Review Letters·J ZhouZ Bukowski
Oct 27, 2010·Advanced Materials·Raoul ScherwitzlJean-Marc Triscone
May 1, 2012·Physical Review Letters·A D CavigliaA Cavalleri

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Citations

May 18, 2016·ACS Applied Materials & Interfaces·Tony YaminAmos Sharoni
Jan 26, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Hua BaiZhu-An Xu
Nov 22, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Xiangzhuo XingZhixiang Shi
Feb 27, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Mehwish Khalid ButtKexin Jin
Jun 20, 2017·Advanced Materials·Xuegang ChenXia Hong

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