Decoupling of magnetism and electric transport in single-crystal (Sr1–xAx)2IrO4 (A = Ca or Ba)
Abstract
Here, we report a systematical structural, transport and magnetic study of Ca or Ba doped Sr2IrO4 single crystals. Isoelectronically substituting Ca2+ (up to 15%) or Ba2+ (up to 4%) ion for the Sr2+ ion provides no additional charge carriers but effectively changes the lattice parameters in Sr2IrO4. In particular, 15% Ca doping considerably reduces the c-axis and the unit cell by nearly 0.45% and 1.00%, respectively. These significant, anisotropic compressions in the lattice parameters conspicuously cause no change in the Néel temperature which remains at 240 K, but drastically reduces the electrical resistivity by up to five orders of magnitude or even precipitates a sharp insulator-to-metal transition at lower temperatures, i.e. the vanishing insulating state accompanies an unchanged Néel temperature in (Sr1–xAx)2IrO4. This observation brings to light an intriguing difference between chemical pressure and applied pressure, the latter of which does suppress the long-range magnetic order in Sr2IrO4. This difference reveals the importance of the Ir1–O2–Ir1 bond angle and homogenous volume compression in determining the magnetic ground state. All results, along with a comparison drawn with results of Tb and La doped Sr2IrO4, underscore that the magnetic transition plays a nonessential role in the formation of the charge gap inmore »
- Authors:
-
- Univ. of Colorado, Boulder, CO (United States)
- Univ. of Colorado, Boulder, CO (United States); National High Magnetic Field Lab., Tallahassee, FL (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Florida State Univ., Tallahassee, FL (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1465028
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physics. Condensed Matter
- Additional Journal Information:
- Journal Volume: 30; Journal Issue: 24; Journal ID: ISSN 0953-8984
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; spin–orbit coupling; iridates; magnetism; chemical doping
Citation Formats
Zhao, H. D., Terzic, Jasminka, Zheng, Hao, Ni, Y. F., Zhang, Y., Ye, Feng, Schlottmann, P., and Cao, Gang. Decoupling of magnetism and electric transport in single-crystal (Sr1–xAx)2IrO4 (A = Ca or Ba). United States: N. p., 2018.
Web. doi:10.1088/1361-648X/aac23d.
Zhao, H. D., Terzic, Jasminka, Zheng, Hao, Ni, Y. F., Zhang, Y., Ye, Feng, Schlottmann, P., & Cao, Gang. Decoupling of magnetism and electric transport in single-crystal (Sr1–xAx)2IrO4 (A = Ca or Ba). United States. https://doi.org/10.1088/1361-648X/aac23d
Zhao, H. D., Terzic, Jasminka, Zheng, Hao, Ni, Y. F., Zhang, Y., Ye, Feng, Schlottmann, P., and Cao, Gang. Mon .
"Decoupling of magnetism and electric transport in single-crystal (Sr1–xAx)2IrO4 (A = Ca or Ba)". United States. https://doi.org/10.1088/1361-648X/aac23d. https://www.osti.gov/servlets/purl/1465028.
@article{osti_1465028,
title = {Decoupling of magnetism and electric transport in single-crystal (Sr1–xAx)2IrO4 (A = Ca or Ba)},
author = {Zhao, H. D. and Terzic, Jasminka and Zheng, Hao and Ni, Y. F. and Zhang, Y. and Ye, Feng and Schlottmann, P. and Cao, Gang},
abstractNote = {Here, we report a systematical structural, transport and magnetic study of Ca or Ba doped Sr2IrO4 single crystals. Isoelectronically substituting Ca2+ (up to 15%) or Ba2+ (up to 4%) ion for the Sr2+ ion provides no additional charge carriers but effectively changes the lattice parameters in Sr2IrO4. In particular, 15% Ca doping considerably reduces the c-axis and the unit cell by nearly 0.45% and 1.00%, respectively. These significant, anisotropic compressions in the lattice parameters conspicuously cause no change in the Néel temperature which remains at 240 K, but drastically reduces the electrical resistivity by up to five orders of magnitude or even precipitates a sharp insulator-to-metal transition at lower temperatures, i.e. the vanishing insulating state accompanies an unchanged Néel temperature in (Sr1–xAx)2IrO4. This observation brings to light an intriguing difference between chemical pressure and applied pressure, the latter of which does suppress the long-range magnetic order in Sr2IrO4. This difference reveals the importance of the Ir1–O2–Ir1 bond angle and homogenous volume compression in determining the magnetic ground state. All results, along with a comparison drawn with results of Tb and La doped Sr2IrO4, underscore that the magnetic transition plays a nonessential role in the formation of the charge gap in the spin–orbit-tuned iridate.},
doi = {10.1088/1361-648X/aac23d},
journal = {Journal of Physics. Condensed Matter},
number = 24,
volume = 30,
place = {United States},
year = {Mon May 21 00:00:00 EDT 2018},
month = {Mon May 21 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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Works referencing / citing this record:
Crossover between Mott and Efros-Shklovskii variable-range hopping in Sr 2 IrO 4 epitaxial thin films by misfit strain and isovalent doping
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Figures / Tables found in this record: