•Thermal conductivity data for K1−xLixTaO3 and KTa1−xNbxO3 are reported.•Unlike conventional relaxors, K1−xLixTaO3 and KTa1−xNbxO3 do not show glasslike thermal conductivity.•The lack of glasslike behavior is also confirmed by low-temperature heat capacity measurements.Thermal conductivity data between 1.8 and 300 K are reported for K1−xLixTaO3 (0≤x≤0.03) and KTa1−xNbxO3 (0≤x≤0.16) single crystals. Whereas lightly Li- and Nb-doped crystals exhibit relaxor-like behavior in dielectric susceptibility, they do not show the glasslike thermal transport found in conventional relaxors such as PbMg1/3Nb2/3O3 and Na1/2Bi1/2TiO3. The lack of glasslike behavior in K1−xLixTaO3 and KTa1−xNbxO3 is confirmed by the absence of temperature-linear contribution in heat capacity.

•Thermal conductivity data for Bi2WO6, SrBi2Ta2O9, and Bi4Ti3O12 are reported.•SrBi2Ta2O9 shows a glasslike temperature dependence of thermal conductivity.•Unlike glasses, SrBi2Ta2O9 does not show a temperature-linear contribution in heat capacity.The in-plane thermal conductivity of Bi2WO6, SrBi2Ta2O9, and Bi4Ti3O12 single crystals has been measured from 2 to 320 K. These compounds are representative members of the Aurivillius ferroelectrics having one, two, and three perovskite-like layered blocks in the structure, respectively. In contrast to Bi2WO6 and Bi4Ti3O12, SrBi2Ta2O9 has much lower glasslike thermal conductivity that is attributed to strong cation disorder in the crystal. Unlike glasses, however, SrBi2Ta2O9 does not exhibit a temperature-linear contribution in its heat capacity.

•Thermal conductivity measurements have been performed from 2 to 330 K on single crystals of pyrochlore R2Ti2O7 (R=Gd, Tb, Dy, Ho, Er, Lu, and Y).•The spin-liquid system Tb2Ti2O7 shows heavily suppressed thermal conductivity below 100 K.•The anomalous thermal conductivity of Tb2Ti2O7 can be attributed to the presence of unusually strong coupling between the phonons and crystal field excitations.Thermal conductivity measurements have been performed from 2 to 330 K on single crystals of pyrochlore R2Ti2O7 (R=Gd, Tb, Dy, Ho, Er, Lu, and Y). The spin-liquid system Tb2Ti2O7 shows heavily suppressed thermal conductivity below 100 K, which can be attributed to the presence of unusually strong coupling between the phonons and crystal electric field excitations in this compound. For the other R2Ti2O7 compounds, the magnetic moment of the R ion does not appear to play important roles in thermal conductivity for the present temperature region.

We report low-temperature heat capacity measurements on CuRh2S4 and CuRh2Se4. These compounds undergo a superconducting transition at Tc=4.72Tc=4.72 and 3.38 K, respectively, with a fully opened superconducting gap. With increasing magnetic field HH, the Sommerfeld coefficient γ(H)γ(H) shows a crossover from linear to sublinear HH dependence that is consistent with the predictions of recent theoretical calculations. Compared to CuRh2Se4, CuRh2S4 exhibits a smaller region of the linear-HH dependence in γ(H)γ(H) and pronounced positive curvature in the temperature dependence of the upper critical field.Highlights► Heat capacity of spinel superconductors CuRh2S4 and CuRh2Se4 are measured. ► For both compounds, the results in zero magnetic field indicate weak- to moderate-coupling ss-wave superconductivity. ► CuRh2S4 shows anomalous features in magnetic fields.

The thermodynamic properties of the spinel ferromagnetic compounds CdCr2Se4 and CdCr2S4 have been investigated by making heat capacity and thermal expansion measurements on single crystals. For both compounds, the ferromagnetic transition is marked by λλ-type thermal anomalies, and the results provide a pressure dependence of the transition temperatures that is in agreement with direct measurements. Below the transition, CdCr2S4 shows an anomalous heat-capacity contribution and negative thermal expansion, which are in contrast to the conventional behavior found in CdCr2Se4.Highlights► The thermal properties of single-crystalline CdCr2Se4 and CdCr2S4 are studied. ► Pressure dependence of the ferromagnetic transition temperatures is obtained through the thermodynamic relationship. ► CdCr2S4 shows anomalous thermal properties.

•Thermal conductivity data for Bi2WO6, SrBi2Ta2O9, and Bi4Ti3O12 are reported.•SrBi2Ta2O9 shows a glasslike temperature dependence of thermal conductivity.•Unlike glasses, SrBi2Ta2O9 does not show a temperature-linear contribution in heat capacity.The in-plane thermal conductivity of Bi2WO6, SrBi2Ta2O9, and Bi4Ti3O12 single crystals has been measured from 2 to 320 K. These compounds are representative members of the Aurivillius ferroelectrics having one, two, and three perovskite-like layered blocks in the structure, respectively. In contrast to Bi2WO6 and Bi4Ti3O12, SrBi2Ta2O9 has much lower glasslike thermal conductivity that is attributed to strong cation disorder in the crystal. Unlike glasses, however, SrBi2Ta2O9 does not exhibit a temperature-linear contribution in its heat capacity.

The thermodynamic properties of the spinel ferromagnetic compounds CdCr2Se4 and CdCr2S4 have been investigated by making heat capacity and thermal expansion measurements on single crystals. For both compounds, the ferromagnetic transition is marked by λ-type thermal anomalies, and the results provide a pressure dependence of the transition temperatures that is in agreement with direct measurements. Below the transition, CdCr2S4 shows an anomalous heat-capacity contribution and negative thermal expansion, which are in contrast to the conventional behavior found in CdCr2Se4.Highlights► The thermal properties of single-crystalline CdCr2Se4 and CdCr2S4 are studied. ► Pressure dependence of the ferromagnetic transition temperatures is obtained through the thermodynamic relationship. ► CdCr2S4 shows anomalous thermal properties.