Giant Magnetic Fluctuations at the Critical Endpoint in Insulating HoMnO3

J. W. Lynn; N. Lee; O. P. Vajk; P. A. Sharma; S. B. Kim; S-W. Cheong; Y. J. Choi; Y. S. Oh

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Giant Magnetic Fluctuations at the Critical Endpoint in Insulating HoMnO3

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arxiv 1304.4712 v1 pith:ZN6XFKRI submitted 2013-04-17 cond-mat.str-el

Giant Magnetic Fluctuations at the Critical Endpoint in Insulating HoMnO3

Y. J. Choi , N. Lee , P. A. Sharma , S. B. Kim , O. P. Vajk , J. W. Lynn , Y. S. Oh , S-W. Cheong This is my paper

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Although abundant research has focused recently on the quantum criticality of itinerant magnets, critical phenomena of insulating magnets in the vicinity of critical endpoints (CEP's) have rarely been revealed. Here we observe an emergent CEP at 2.05 T and 2.2 K with a suppressed thermal conductivity and concomitant strong critical fluctuations evident via a divergent magnetic susceptibility (e.g., chi''(2.05 T, 2.2 K)/chi''(3 T, 2.2 K)=23,500 %, comparable to the critical opalescence in water) in the hexagonal insulating antiferromagnet HoMnO3.

Giant Magnetic Fluctuations at the Critical Endpoint in Insulating HoMnO3

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