Possible observation of highly itinerant quantum magnetic monopoles in the frustrated pyrochlore Yb2Ti2O7.

Abstract:

:The low-energy elementary excitations in frustrated quantum magnets have fascinated researchers for decades. In frustrated Ising magnets on a pyrochlore lattice possessing macroscopically degenerate spin-ice ground states, the excitations have been discussed in terms of classical magnetic monopoles, which do not contain quantum fluctuations. Here we report unusual behaviours of magneto-thermal conductivity in the disordered spin-liquid regime of pyrochlore Yb2Ti2O7, which hosts frustrated spin-ice correlations with large quantum fluctuations owing to pseudospin-1/2 of Yb ions. The analysis of the temperature and magnetic field dependencies shows the presence of gapped elementary excitations. We find that the gap energy is largely suppressed from that expected in classical monopoles. Moreover, these excitations propagate a long distance without being scattered, in contrast to the diffusive nature of classical monopoles. These results suggests the emergence of highly itinerant quantum magnetic monopole, which is a heavy quasiparticle that propagates coherently in three-dimensional spin liquids.

journal_name

Nat Commun

journal_title

Nature communications

authors

Tokiwa Y,Yamashita T,Udagawa M,Kittaka S,Sakakibara T,Terazawa D,Shimoyama Y,Terashima T,Yasui Y,Shibauchi T,Matsuda Y

doi

10.1038/ncomms10807

subject

Has Abstract

pub_date

2016-02-25 00:00:00

pages

10807

issn

2041-1723

pii

ncomms10807

journal_volume

7

pub_type

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