Enhanced thermal Hall conductivity below 1 Kelvin in the pyrochlore magnet YbTiO
M Hirschberger, P Czajka, SM Koohpayeh… - arXiv preprint arXiv …, 2019 - arxiv.org
arXiv preprint arXiv:1903.00595, 2019•arxiv.org
In this letter, we report the gigantic thermal Hall effect $\kappa_ {xy} $ in the low-field
correlated-paramagnetic state of the frustrated pyrochlore Yb $ _2 $ Ti $ _2 $ O $ _7 $. We
observed a record magnitude for the thermal Hall angle in an insulator, $\left|\kappa_
{xy}\right|/\kappa_ {xx}\sim 2\,\% $. The signal onsets at $ T\sim 3\, $ K and is severely
weakened around the transition to canted ferromagnetic order at $ T_\text {CFM}= 0.275\, $
K. Besides the large $\kappa_ {xy}> 0$ of the fluctuating regime, a sign change towards …
correlated-paramagnetic state of the frustrated pyrochlore Yb $ _2 $ Ti $ _2 $ O $ _7 $. We
observed a record magnitude for the thermal Hall angle in an insulator, $\left|\kappa_
{xy}\right|/\kappa_ {xx}\sim 2\,\% $. The signal onsets at $ T\sim 3\, $ K and is severely
weakened around the transition to canted ferromagnetic order at $ T_\text {CFM}= 0.275\, $
K. Besides the large $\kappa_ {xy}> 0$ of the fluctuating regime, a sign change towards …
In this letter, we report the gigantic thermal Hall effect in the low-field correlated-paramagnetic state of the frustrated pyrochlore YbTiO. We observed a record magnitude for the thermal Hall angle in an insulator, . The signal onsets at K and is severely weakened around the transition to canted ferromagnetic order at K. Besides the large of the fluctuating regime, a sign change towards negative occurs at the lowest temperatures and in moderate field, where sharp magnon excitations appear in the inelastic neutron scattering spectra. We analyze the magnon-Hall signal and its suppression with field semi-quantitatively. A contribution of phonon skew scattering to is ruled out by a comparison of for Tb-, Yb-, and Y-based rare earth pyrochlore titanates. These results represent the first report of non-vanishing measured in a dilution refrigerator (K).
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