Erratum: Magnetic phase transitions and magnetoelectric coupling of GdFeO3single crystals probed by low-temperature heat transport [Phys. Rev. B83, 014414 (2011)]

Ground state and magnetic phase transitions of orthoferriteDyFeO3

“…P (T ) was measured at a rate of about 2 K/min from 300 mK to 5 K. In order to stabilize temperature in the P (H) measurements, the sweepingfield rate must be slower for lower temperature, which is 0.25, 0.2, 0.15, and 0.1 T/min at 2, 1.4, 1, and 0.7 K, respectively. Thermal conductivity was measured by using a "one heater, two thermometers" technique and three different cryostats: [30][31][32][33][34][35][36] (i) in a 3 He- 4 He dilution refrigerator at temperature regime of 70 mK-1 K; (ii) in a 3 He refrigerator at 0.3-8 K, and (iii) in a pulse-tube refrigerator for zero-field data at T > 5 K. In all these measurements, the magnetic fields were applied along the c axis.…”

“…[28][29][30][31][32][33][34][35] In this work, we study the low-T thermal conductivity (κ), as well as the magnetization (M ) and electric polarization, of DyFeO 3 single crystals with H c after a zero field cooling (ZFC) process. In particular, the P measurements can be done at temperatures below 1 K, while the κ is measured at temperatures down to several tens of milli-Kelvin.…”

“…Using the β value obtained from the above specific-heat data, the phonon velocity can be calculated and then the mean free path is obtained from the κ. 32,33 The inset to Fig. 5(b) shows the ratio between l and the averaged sample width W = 2 A/π = 0.335 mm, 32,33,38 where A is the area of cross section.…”

Irreversible magnetic-field dependence of low-temperature heat transport of spin-ice compound Dy2Ti2O7in a

“…2 shows the ratios l/W for the two samples, where W is the averaged sample width. 36,41 It is clear that both ratios increase quickly at very low temperatures and are expected to approach 1 below 0.3 K. This estimation tells us that it is not likely that the magnetic excitations in DTO (for examples, magnetic monopoles) can make a sizable contribution to transporting heat, since the experimental κ is even smaller than the phonon term in a boundary scattering limit. It should be pointed out that the magnetic-monopole excitations were believed to be negligible at very low temperatures, because the energy barrier for flipping a spin or creating a pair of magnetic monopoles is about 4.4 K. 42 …”

“…Using the β value obtained from specific-heat measurements (not shown here), the phonon velocity can be calculated and then the mean free path is obtained from the κ. 36,41 The inset to Fig. 2 shows the ratios l/W for the two samples, where W is the averaged sample width.…”