Spin glass anomalies in HP-NdPtSn—structural, magnetic and specific heat studies

The hexagonal high-pressure (HP) modification of NdPtSn was prepared under multianvil high-pressure (10.5 GPa) high-temperature (1425 K) conditions from the orthorhombic normal-pressure (NP) modification. NP- and HP-NdPtSn were studied by X-ray powder and single crystal diffraction: TiNiSi type, Pnma  , a=737.2(1)a=737.2(1), b=460.0(1)b=460.0(1), c=799.6(2) pmc=799.6(2) pm, wR2=0.0662wR2=0.0662, 441 F2F2 values, 20 variable parameters for NP-NdPtSn, and ZrNiAl type, P62¯m, a=753.55(5)a=753.55(5), c=410.55(4) pmc=410.55(4) pm, wR2=0.0709wR2=0.0709, 248 F2F2 values, 14 variable parameters for HP-NdPtSn. Temperature dependent susceptibility measurements reveal paramagnetism for HP-NdPtSn above 20 K with an experimental magnetic moment of 3.73(2) μB/μB/Nd mol and a paramagnetic Curie temperature θPθP of −5(1)−5(1) K. The low-temperature data indicate spin glass behavior with a freezing temperature around 4.5 K. The spin glass anomalies are also evident from specific heat measurements.

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