TY - JOUR
T1 - The nature of the first order isostructural transition in GdRhSn
AU - Gupta, Sachin
AU - Suresh, K. G.
AU - Nigam, A. K.
AU - Mudryk, Y.
AU - Paudyal, D.
AU - Pecharsky, V. K.
AU - Gschneidner, K. A.
N1 - Funding Information:
SG would like to thank CSIR, New Delhi for granting senior research fellowship. The Ames Laboratory is operated by Iowa State University of Science and Technology for the US Department of Energy under contract No. DE-AC02-07CH11358. Work at Ames Laboratory (theoretical calculations and temperature dependent X-ray powder diffraction measurements) is supported by the Office of Basic Energy Sciences, Materials Sciences Division of the Office of Science, US Department of Energy.
PY - 2014/11/15
Y1 - 2014/11/15
N2 - We present structural, magnetic, thermal, magnetocaloric, and electrical transport properties of polycrystalline GdRhSn. Magnetization data show that it orders antiferromagnetically at TN = 16.2 K. The compound has the ZrNiAl type hexagonal crystal structure at room temperature and undergoes a first order iso-structural transition in the paramagnetic state at 245 K. The unit cell volume change at the transition is small (-0.07%) but discontinuous, in agreement with the first-order nature of the transition observed by magnetic, transport, and heat capacity measurements. The anisotropic changes of the lattice parameters are Δa/a = 0.28% and Δc/c = -0.64% on cooling. A substantial change in the 4f and conduction electron hybridization, giving rise to an increased integrated DOS, occurs when the high temperature phase transforms to the low temperature phase. A moderate magnetocaloric effect at TN (ΔSM = -6.5 J/kg K and ΔTad = 4.5 K for ΔH = 50 kOe) has been measured using both magnetization and heat capacity data.
AB - We present structural, magnetic, thermal, magnetocaloric, and electrical transport properties of polycrystalline GdRhSn. Magnetization data show that it orders antiferromagnetically at TN = 16.2 K. The compound has the ZrNiAl type hexagonal crystal structure at room temperature and undergoes a first order iso-structural transition in the paramagnetic state at 245 K. The unit cell volume change at the transition is small (-0.07%) but discontinuous, in agreement with the first-order nature of the transition observed by magnetic, transport, and heat capacity measurements. The anisotropic changes of the lattice parameters are Δa/a = 0.28% and Δc/c = -0.64% on cooling. A substantial change in the 4f and conduction electron hybridization, giving rise to an increased integrated DOS, occurs when the high temperature phase transforms to the low temperature phase. A moderate magnetocaloric effect at TN (ΔSM = -6.5 J/kg K and ΔTad = 4.5 K for ΔH = 50 kOe) has been measured using both magnetization and heat capacity data.
KW - Iso-structural transition
KW - Magnetocaloric effect
KW - Rare earth intermetallic
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U2 - 10.1016/j.jallcom.2014.06.027
DO - 10.1016/j.jallcom.2014.06.027
M3 - Article
AN - SCOPUS:84903614271
SN - 0925-8388
VL - 613
SP - 280
EP - 287
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -