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Multistage symmetry breaking in the breathing pyrochlore lattice Li(Ga,In)Cr4O8

Title: Multistage symmetry breaking in the breathing pyrochlore lattice Li(Ga,In)Cr4O8.
Name(s): Lee, S., author
Do, S.-H., author
Lee, W.-J., author
Choi, Y. S., author
Lee, M., author
Choi, E. S., author
Reyes, A. P., author
Kuhns, P. L., author
Ozarowski, A., author
Choi, K.-Y., author
Type of Resource: text
Genre: Text
Date Issued: 2016-05-02
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: We present magnetic susceptibility, dielectric constant, high-frequency electron spin resonance, Li-7 nuclear magnetic resonance, and zero-field muon spin relaxation measurements of LiACr(4)O(8) (A = Ga, In), towards realizing a breathing pyrochlore lattice. Unlike the uniform pyrochlore ZnCr2O4 lattice, both the In and the Ga compounds feature two-stage symmetry breaking: a magnetostructural phase transition with subsequent antiferromagnetic ordering. We find a disparate symmetry breaking process between the In and the Ga compounds, having different degrees of bond alternation. Our data reveal that the Ga compound with moderate bond alternation shows the concomitant structural and magnetic transition at T-S = 15.2 K, followed by the magnetic ordering at T-m = 12.9 K. In contrast, the In compound with strong bond alternation undergoes a thermal crossover at T* approximate to 20.1 K from a tetramer singlet to a dimer singlet or a correlated paramagnet with a separate weak magnetostructural transition at T-S = 17.6 K and the second antiferromagnetic ordering at T-m = 13.7 K. This suggests that the magnetic phases and correlations of the breathing pyrochlore lattice can be determined from the competition between bond alternation and spin-lattice coupling, thus stabilizing long-range magnetic ordering against a nonmagnetic singlet.
Identifier: FSU_libsubv1_wos_000375525700002 (IID), 10.1103/PhysRevB.93.174402 (DOI)
Keywords: antiferromagnet, quantum spin liquid, relaxation, transition, zncr2o4
Publication Note: The publisher’s version of record is available at
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Host Institution: FSU
Is Part Of: Physical Review B.
Issue: iss. 17, vol. 93

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Lee, S., Do, S. -H., Lee, W. -J., Choi, Y. S., Lee, M., Choi, E. S., … Choi, K. -Y. (2016). Multistage symmetry breaking in the breathing pyrochlore lattice Li(Ga,In)Cr4O8. Physical Review B. Retrieved from