Dwivedi, VK (2023) Identification of a Griffiths-like phase and its evolution in the substituted pyrochlore iridates Y2Ir2-xCrx O7 (x = 0.0, 0.05, 0.1, 0.2). In: Physical Review B, 107 (13).
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Abstract
We report the Griffiths phase (GP)-like state along with a cluster-glass-like state in geometrically frustrated antiferromagnetic Cr-substituted Y2Ir2O7 pyrochlore iridates. The strength of the GP-like behavior increases with substitution. Interestingly, isothermal remanent magnetization suggests the Ising-like interaction of spins in the GP region. The GP-like state is not attributed to the structural disorder as substitution of Cr does not induce any structural change. Then the spin coupling between Cr3+↔Cr3+, Ir4+↔Ir4+, Ir4+↔Cr3+, and Ir4+↔Ir5+ leads to the competition between antiferromagnetic and ferromagnetic correlations. It gives rise to Ruderman-Kittel-Kasuya-Yosida (RKKY)-like interaction between Cr3+ local magnetic moments mediated by itinerant Ir conduction electrons, hence, as a result, GP and cluster-glass-like states emerge.
| Item Type: | Journal Article |
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| Publication: | Physical Review B |
| Publisher: | American Physical Society |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Glass; Magnetic moments; Ternary alloys, Antiferromagnetic correlations; Antiferromagnetics; As substitutions; Cluster glass; Griffiths phase; Isothermal remanent magnetization; Phase region; Pyrochlores; Spin-coupling; Structural disorders, Antiferromagnetism |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 15 Jun 2023 09:06 |
| Last Modified: | 15 Jun 2023 09:06 |
| URI: | https://eprints.iisc.ac.in/id/eprint/81960 |
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