Extraordinary Responsive Rare Earth Magnetic Materials

Personnel

Project Leader(s):
Vitalij Pecharsky

Principal Investigators:
Scott Chumbley, Karl Gschneidner, Jr., Gordon Miller, Vitalij Pecharsky

Postdoctoral Research Associates:
Mahmud Khan, Hui Wang, Junding Zou

Overview

A major goal of this research is to uncover the underlying electronic, atomic and microscopic interactions that result in an extraordinarily strong coupling between the magnetic and crystal lattices and remarkable responsiveness to both strong (temperature and pressure) and weak (magnetic field) stimuli in some rare earth intermetallic materials. It will be achieved by focusing on the state-of-the-art synthesis, processing and characterization, combined with theory, modeling and computations gauged and refined against reliable experimental data.

The following systems have been selected as model candidates: GdNi and other equiatomic RM compounds (R is a rare earth metal and M is a 3d transition metal or a main Group 14 element), RCo2, La(Fe1‑xSix)13 and hydrides La(Fe1‑xSix)13Hy, and R5T4 compounds (T is a main Group 14 element). These materials exhibit a number of diverse and unique properties associated with magnetic ordering alone, magneto-volume, itinerant electron metamagnetic, and magnetic-martensitic transformations, respectively, which may or may not be driven by a reversible breaking and reforming of specific chemical bonds.

Development and validation of phenomenological models of transformations that range from magneto-volume to magnetic-martensitic is another goal, thus guiding future discoveries of material systems exhibiting strong reactions to small changes of magnetic field, with temperature and pressure providing additional sources of stimulation.

Highlights

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Publications

2013
Pathak A K; Paudyal D; Mudryk Y; Gschneidner K A; Pecharsky V K . 2013. Anomalous Schottky Specific Heat and Structural Distortion in Ferromagnetic PrAl2. Physical Review Letters. 110:186405. abstract
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Wang C L; Zou J D; Liu J; Mudryk Y; Gschneidner K A; Long Y; Smetana V; Miller G J; Pecharsky V K . 2013. Crystal structure, magnetic properties, and the magnetocaloric effect of Gd5Rh4 and GdRh. Journal of Applied Physics. 113:17a904. abstract
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Khan M; Paudyal D; Gschneidner K A; Pecharsky V K . 2013. Magnetic properties of Ho1-xErxAl2 alloys. Journal of Applied Physics. 113:17e106. abstract
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Liu J; Smetana V; Gschneidner K A; Miller G J; Pecharsky V K . 2013. The crystal structure and magnetic properties of Pr117Co56.7Ge112. Journal of Applied Physics. 113:17e120. abstract
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Mudryk Y; Pecharsky V K; Gschneidner K A . 2013. Unusual magnetic frustration in Lu-doped Gd5Ge4. Journal of Applied Physics. 113:17e104. abstract
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Cao Q; Chumbley L S; Mudryk Y; Zou M; Pecharsky V K; Gschneidner K A . 2013. Effects of mechanical grinding and low temperature annealing on crystal structure of Er5Si4. Journal of Alloys and Compounds. 556:127-134. abstract
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Morrison K; Dupas A; Mudryk Y; Pecharsky V K; Gschneidner K A; Caplin A D; Cohen L F . 2013. Identifying the critical point of the weakly first-order itinerant magnet DyCo2 with complementary magnetization and calorimetric measurements. Physical Review B. 87:134421. abstract
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Mudryk Y; Manfrinetti P; Smetana V; Liu J; Fornasini M L; Provino A; Pecharsky V K; Miller G J; Gschneidner K A . 2013. Structural disorder and magnetism in rare-earth (R) R117Co54+xSn112 +/- y. Journal of Alloys and Compounds. 557:252-260. abstract
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Provino A; Paudyal D; Fornasini M L; Dhiman I; Dhar S K; Das A; Mudryk Y; Manfrinetti P; Pecharsky V K . 2013. Unexpected crystal and magnetic structures in MnCu4In and MnCu4Sn. Acta Materialia. 61:2236-2243. abstract
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Provino A; Paudyal D; Fornasini M L; Dhiman I; Dhar S K; Das A; Mudryk Y; Manfrinetti P; Pecharsky V K . 2013. Unexpected crystal and magnetic structures in MnCu4In and MnCu4Sn. Acta Materialia. 61:2236-2243. abstract
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