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Title

Impact of hydrogen absorption on crystal structure and magnetic properties of geometrically frustrated Nd2Ni2In

Authors
Mašková, S.
Havela, L.
Daniš, S.
Llobet, A.
Nakotte, H.
Kothapalli, K.
Kolomiets, A.
Published in Journal of Alloys and Compounds. 2013, vol. 566, p. 22-30
Abstract Nd2Ni2In orders antiferromagnetically at TN = 8K.Apossible first-ordertype of the phase transition can be related to the frustrated lattice of the Shastry–Sutherland type.The transition does not shift in mag- netic field but turns into aferromagnetic transition in magnetic fieldsexceeding 0.3 T.Powder neutron diffraction determined the magnetic structure with Nd moments oriented mutually perpendicular along the directions of the (110) type. Large change of magnetic entropy in weak magnetic fields leads to a giant magnetocaloric effect. Reversible hydrogen absorption in pressures of several bar leads to the hydride Nd2Ni2InH~7 achieved through the sequence of intermediate hydrides. The highest hydride has an orthorhombic distortion and volume expansion exceeding 23%.It is antiferromagnetic below TN ~ 3 K.
Keywords AntiferromagnetismFrustrationHydrogenMagnetocaloric effect
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MAŠKOVÁ, S. et al. Impact of hydrogen absorption on crystal structure and magnetic properties of geometrically frustrated Nd2Ni2In. In: Journal of Alloys and Compounds, 2013, vol. 566, p. 22-30. https://archive-ouverte.unige.ch/unige:35154

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Deposited on : 2014-03-31

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