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We study the low-temperature heat transport of Nd_3Ga_5SiO_{14}, which is aspin-liquid candidate, to probe the nature of ground state and the effect ofmagnetic field on the magnetic properties. The thermal conductivity (\kappa)shows a purely phononic transport in zero field. The external magnetic fieldalong the c axis induces a dip-like behavior of \kappa(H), which can beattributed to a simple paramagnetic scattering on phonons. However, themagnetic 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-inducedpartial order, which yields low-energy magnetic excitations that significantlyscatter phonons. These results point to a paramagnetic ground state thatpartial magnetic order can be induced by magnetic field along the ab plane,which is also signified by the low-T specific heat data.

Paramagnetic ground state with field-induced partial order in Nd_3Ga_5SiO_{14} probed by low-temperature heat transport