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Thermodynamic properties of quadrupolar states in the frustrated pyrochlore magnet Tb$_2$Ti$_2$O$_7$ | | H. Takatsu
; T. Taniguchi
; S. Kittaka
; T. Sakakibara
; H. Kadowaki
; | | Date: |
24 Apr 2017 | | Abstract: | The low-temperature thermodynamic properties of the frustrated pyrochlore
Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$ have been studied using the single crystal of
$x=0.005$ sitting in a long range ordered phase in the $x$-$T$ phase diagram.
We observed that the specific heat exhibits a minimum around 2 K and slightly
increases on cooling, similar to a Schottky-like anomaly for canonical spin
ices. A clear specific-heat peak observed at $T_{
m c} = 0.53$ K is ascribable
to the phase transition to a quadrupolar state, which contributes to a
relatively large change in entropy, $S simeq 2.7$ J K$^{-1}$mol$^{-1}$.
However, it is still smaller than $Rln2$ for the ground state doublet of the
Tb ions. The entropy release persists to higher temperatures, suggesting strong
fluctuations associated with spin ice correlations above $T_{
m c}$. We
discuss the field dependence of the entropy change for $H||[111]$ and
$H||[001]$. | | Source: | arXiv, 1704.7119 | | Services: | Forum | Review | PDF | Favorites | |
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