Strong magnetic anisotropy and unusual magnetic field reinforced phase in URhSn with a quasi-kagome structure

Pressure induced multicriticality and electronic instability in quasi-kagome ferromagnet URhSn

“…Single crystals were annealed at 800 • C under a vacuum better than 10 −6 torr for 30 days. Although, annealing does not affect the magnetic properties of URhSn, the annealed samples showed sharper transitions at T O and T C , as seen by specific heat [13]. The high quality of the single crystal used for resistivity under pressure experiments was confirmed by sharp Laue spots, high RRR (41) and low residual resistivity (6.5 µΩ cm) as well as quantum oscillations of frequencies up to 1.55 kT (see Figs.…”

“…1a) [11]. Two phase transitions occur in URhSn at temperatures T O =52-58 K and T C =16-17 K, where T O is well characterized by a large jump in specific heat (10 J/K-mol), sharp drop in electrical resistivity, and a feeble kink in magnetization [13][14][15][16][17]. Although the ground state of URhSn is ferromagnetic, the nature of order parameter for the phase transition at T O remains hidden in neutron scattering [15] and 119 Sn Mössbauer spectroscopy [18].…”

“…Although the ground state of URhSn is ferromagnetic, the nature of order parameter for the phase transition at T O remains hidden in neutron scattering [15] and 119 Sn Mössbauer spectroscopy [18]. A quadrupolar order or a non-collinear magnetic phase below T O is inferred by a reinforcement of T O (H) in magnetic fields parallel to the c-axis [13]. A small Sommerfeld coefficient (γ = 12 mJ/mol K 2 ) in specific heat capacity and a relatively large ordered moment of 2.1 µ B /U observed in neutron scattering are consistent with a weak c-f hybridization and nearly-localized 5f -electrons in URhSn at ambient pressure [13,15].…”

“…A large mean free path further attests high quality of the single crystal. A bar shaped sample of dimension 0.8 mm×0.3 mm×0.2 mm with long direction parallel to [11][12][13][14][15][16][17][18][19][20] was obtained by means of Laue method and a spark erosion cutting machine. For estimation of phonon contribution to resistivity, a polycrystalline sample of ThRhSn was prepared by arc-melting process.…”

Hidden-orders of uranium compounds

“…Recently, it is reported that URhSn, belonging to the space group of P 62m (D 3 3h , #189), undergoes two phase transitions, with 16K and 54K [10]. The ground state is ferromagnetic,…”