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Title: Metal insulator transition and magnetotransport anomalies in perovskite SrIr{sub 0.5}Ru{sub 0.5}O{sub 3} thin films

Abstract

We investigated the nature of transport and magnetic properties in SrIr{sub 0.5}Ru{sub 0.5}O{sub 3} (SIRO), which has characteristics intermediate between a correlated non-Fermi liquid state and an itinerant Fermi liquid state, by growing perovskite thin films on various substrates (e.g., SrTiO{sub 3} (001), (LaAlO{sub 3}){sub 0.3}(Sr{sub 2}TaAlO{sub 6}){sub 0.7} (001), and LaAlO{sub 3} (001)). We observed systematic variation of underlying substrate dependent metal-to-insulator transition temperatures (T{sub MIT} ∼ 80 K on SrTiO{sub 3}, ∼90 K on (LaAlO{sub 3}){sub 0.3}(Sr{sub 2}TaAlO{sub 6}){sub 0.7}, and ∼100 K on LaAlO{sub 3}) in resistivity. At temperature 300 K ≥ T ≥ T{sub MIT}, SIRO is metallic and its resistivity follows a T{sup 3/2} power law, whereas insulating nature at T < T{sub MIT} is due to the localization effect. Magnetoresistance (MR) measurement of SIRO on SrTiO{sub 3} (001) shows negative MR at T < 25 K and positive MR at T > 25 K, with negative MR ∝ B{sup 1/2} and positive MR ∝ B{sup 2}; consistent with the localized-to-normal transport crossover dynamics. Furthermore, observed spin glass like behavior of SIRO on SrTiO{sub 3} (001) at T < 25 K in the localized regime validates the hypothesis that (Anderson) localization favors glassy ordering. These remarkable features provide a promising approach for future applications and of fundamental interest in oxide thin films.

Authors:
; ; ;  [1]
  1. Department of Physics, POSTECH, Pohang 790-784 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22399320
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINATES; CUBIC LATTICES; FERMI GAS; IRIDIUM COMPOUNDS; LANTHANUM COMPOUNDS; MAGNETIC PROPERTIES; MAGNETORESISTANCE; PHASE TRANSFORMATIONS; RUTHENIUM OXIDES; SPIN GLASS STATE; STRONTIUM TITANATES; SUBSTRATES; TANTALUM COMPOUNDS; TEMPERATURE DEPENDENCE; THIN FILMS; TRANSITION TEMPERATURE

Citation Formats

Biswas, Abhijit, Lee, Yong Woo, Kim, Sang Woo, and Jeong, Yoon Hee, E-mail: yhj@postech.ac.kr. Metal insulator transition and magnetotransport anomalies in perovskite SrIr{sub 0.5}Ru{sub 0.5}O{sub 3} thin films. United States: N. p., 2015. Web. doi:10.1063/1.4915943.
Biswas, Abhijit, Lee, Yong Woo, Kim, Sang Woo, & Jeong, Yoon Hee, E-mail: yhj@postech.ac.kr. Metal insulator transition and magnetotransport anomalies in perovskite SrIr{sub 0.5}Ru{sub 0.5}O{sub 3} thin films. United States. doi:10.1063/1.4915943.
Biswas, Abhijit, Lee, Yong Woo, Kim, Sang Woo, and Jeong, Yoon Hee, E-mail: yhj@postech.ac.kr. Sat . "Metal insulator transition and magnetotransport anomalies in perovskite SrIr{sub 0.5}Ru{sub 0.5}O{sub 3} thin films". United States. doi:10.1063/1.4915943.
@article{osti_22399320,
title = {Metal insulator transition and magnetotransport anomalies in perovskite SrIr{sub 0.5}Ru{sub 0.5}O{sub 3} thin films},
author = {Biswas, Abhijit and Lee, Yong Woo and Kim, Sang Woo and Jeong, Yoon Hee, E-mail: yhj@postech.ac.kr},
abstractNote = {We investigated the nature of transport and magnetic properties in SrIr{sub 0.5}Ru{sub 0.5}O{sub 3} (SIRO), which has characteristics intermediate between a correlated non-Fermi liquid state and an itinerant Fermi liquid state, by growing perovskite thin films on various substrates (e.g., SrTiO{sub 3} (001), (LaAlO{sub 3}){sub 0.3}(Sr{sub 2}TaAlO{sub 6}){sub 0.7} (001), and LaAlO{sub 3} (001)). We observed systematic variation of underlying substrate dependent metal-to-insulator transition temperatures (T{sub MIT} ∼ 80 K on SrTiO{sub 3}, ∼90 K on (LaAlO{sub 3}){sub 0.3}(Sr{sub 2}TaAlO{sub 6}){sub 0.7}, and ∼100 K on LaAlO{sub 3}) in resistivity. At temperature 300 K ≥ T ≥ T{sub MIT}, SIRO is metallic and its resistivity follows a T{sup 3/2} power law, whereas insulating nature at T < T{sub MIT} is due to the localization effect. Magnetoresistance (MR) measurement of SIRO on SrTiO{sub 3} (001) shows negative MR at T < 25 K and positive MR at T > 25 K, with negative MR ∝ B{sup 1/2} and positive MR ∝ B{sup 2}; consistent with the localized-to-normal transport crossover dynamics. Furthermore, observed spin glass like behavior of SIRO on SrTiO{sub 3} (001) at T < 25 K in the localized regime validates the hypothesis that (Anderson) localization favors glassy ordering. These remarkable features provide a promising approach for future applications and of fundamental interest in oxide thin films.},
doi = {10.1063/1.4915943},
journal = {Journal of Applied Physics},
number = 11,
volume = 117,
place = {United States},
year = {Sat Mar 21 00:00:00 EDT 2015},
month = {Sat Mar 21 00:00:00 EDT 2015}
}