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Magnetic Properties of Hole-Doped Pyrochlore Iridate (Y1-x-yCuxCay)2Ir2O7

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Abstract:

We report the results of studies on the electronic state of the hole-doped Y-based pyrochlore iridate, (Y1-x-yCuxCay)2Ir2O7. We carried out the resistivity, Muon Spin Relaxation (μSR), X-ray Photoemission Spectroscopy (XPS) measurements and Density Functional Theory (DFT) calculations on the non-doped (x=y=0) and doped (x=0.05, y=0.15) systems. We found in the non-doped system that the magnetic ordering of Ir spins which was accompanied by the metal-insulator transition (MIT) occurred at around 157 K and disappeared in the doped system in which MIT seems to disappear or smeared out. We suggest from the current study that a quantum critical point which shows a change in the electronic ground state from insulating to metallic to exist between those two systems.

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Periodical:

Materials Science Forum (Volume 966)

Pages:

269-276

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.966.269

Citation:

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Online since:

August 2019

Authors:

Julia Angel*, Retno Asih, Hironori Nomura, Tomoya Taniguchi, Kazuyuki Matsuhira, Muhammad Redo Ramadhan, Irwan Ramli, Makoto Wakeshima, Yukio Hinatsu, Mohamed Ismail Mohamed-Ibrahim, Sulaiman Shukri, Isao Watanabe

Keywords:

Iridium, Magnetism, Metal-Insulator Transition, Pyrochlore Iridate, Valence State, Yttrium

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* - Corresponding Author

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