Table 1 Overview of reported specific heat parameters.

From: Electronic and magnetic properties of the RuX3 (X = Cl, Br, I) family: two siblings—and a cousin?

Sample

γ

β

TD

\({T}_{{{{\rm{D}}}}}{M}_{{{{{\rm{RuX}}}}}_{3}}^{1/2}\)

RuCl3a 31

 

1.22

185

1

RuBr3 25

 

1.93

159

1.21

RuI3 27

29.3

4.72

118

1.07

RuI3 26

17.7

3.66

129

1.17

  1. γ (β) is the coefficient of the T-linear (T3) contribution and given in units of mJ K−2mol−1 (mJ K−4 mol−1). Debye temperature \({T}_{{{\rm{D}}}}={\left(\frac{12{\pi }^{4}NR}{5\beta }\right)}^{1/3}\) is given in Kelvin and \({T}_{{{{\rm{D}}}}}{M}_{{{{{\rm{RuX}}}}}_{3}}^{1/2}\) as a ratio to the value for RuCl3 (first row), where \({M}_{{{{{\rm{RuX}}}}}_{3}}\) is the harmonic average of the RuX3 mass.
  2. aNote that the values given for RuCl3 correspond to the asymptotic field-polarized limit extracted by Tanaka et al.31, as otherwise at zero field the low-temperature specific heat behavior is dominated by vicinity to the Néel temperature of RuCl3, causing large magnetic contributions to β.
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