X. M. Wang

Magnetic phase transitions and magnetoelectric coupling of GdFeO3 single crystals probed by low-temperature heat transport

The low-temperature thermal conductivity (�) of GdFeO3 single crystals is found to be strongly dependent on magnetic field. The low-field �(H) curves show two “dips” for H k a and only one “dip” for H k c, with the characteristic fields having good correspondence with the spin-flop and the spin-polarization transitions. A remarkable phenomenon is that the subKelvin thermal conductivity shows hysteretic behaviors on the history of applying magnetic field, that is, the �(H) isotherms measured with field increasing are larger than those with field decreasing. Intriguingly, the broad region of magnetic field (� 0–3 T) showing the irreversibility of heat transport coincides with that presenting the ferroelectricity. It is discussed that the irreversible �(H) behaviors are due to the phonon scattering by ferroelectric domain walls. This result shows an experimental feature that points to the capability of controlling the ferroelectric domain structures by magnetic field in multiferroic materials.

Paramagnetic ground state with field-induced partial order in Nd3Ga5SiO14 probed by low-temperature heat transport

We study the low-temperature heat transport of Nd_3Ga_5SiO_{14}, which is a spin-liquid candidate, to probe the nature of ground state and the effect of magnetic field on the magnetic properties. The thermal conductivity (\kappa) shows a purely phononic transport in zero field. The external magnetic field along the c axis induces a dip-like behavior of \kappa(H), which can be attributed to a simple paramagnetic scattering on phonons. However, the magnetic field along the ab plane induces another step-like decrease of \kappa. This kind of \kappa(H) behavior is discussed to be related to a field-induced partial order, which yields low-energy magnetic excitations that significantly scatter phonons. These results point to a paramagnetic ground state that partial magnetic order can be induced by magnetic field along the ab plane, which is also signified by the low-T specific heat data.

Thermal conductivity of pure and Zn-doped LiCu2O2single crystals

We report a study of the low-temperature thermal conductivity (\kappa) of pure and Zn-doped LiCu_2O_2 single crystals. The \kappa(T) of pure LiCu_2O_2 single crystal shows a double-peak behavior, with two peaks locating at 48 K and 14 K, respectively. The different dependences of the peaks on the Zn concentration indicate that the high-T peak is likely due to the phonon transport while the low-T one is attributed to the magnon transport in the spin spiral ordering state. In addition, the magnetic field can gradually suppress the low-T peak but does not affect the high-T one; this further confirms that the low-T peak is originated from the magnon heat transport.

Low-temperature heat transport of Nd2CuO4: Roles of Nd magnons and spin-structure transitions

We report the magnetic-field dependence of thermal conductivity (\kappa) of an insulating cuprate Nd_2CuO_4 at very low temperatures down to 0.3 K. It is found that apart from the paramagnetic moments scattering on phonons, the Nd^{3+} magnons can act as either heat carriers or phonon scatterers, which strongly depends on the long-range antiferromagnetic transition and the field-induced transitions of spin structure. In particular, the Nd^{3+} magnons can effectively transport heat in the spin-flopped state of the Nd^{3+} sublattice. However, both the magnon transport and the magnetic scattering are quenched at very high fields. The spin re-orientations under the in-plane field can be conjectured from the detailed field dependence of \kappa.

Low-temperature heat transport in the layered spin-dimer compound Ba 3 Mn 2 O 8

We report a study on the low-temperature heat transport of the Ba

Synthesis, Characterization, and Luminescence Properties of Uniform Ln3+-Doped YF3 Nanospindles

{}_{3}

A low-temperature route for the synthesis of nanocrystalline LaB6

Mn

Glucose-Assisted Synthesis of CoTe Nanotubes in Situ Templated by Te Nanorods

{}_{2}

Phase transition of CdSe nanocrystallines with controlled morphologies induced by ratios of ethanolamine and water in their mixed solution

O

Growth of ZnS microfans and nanosheets : Controllable morphology and phase

{}_{8}