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

2010
Singh N K; Paudyal D; Mudryk Y; Pecharsky V K; Gschneidner K A . 2010. Magnetostructural properties of Ho-5(Si0.8Ge0.2)(4). Physical Review B. 81:184414. abstract
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Cao Q; Chumbley L S; Qian Z . 2010. Thermal stability of RE5(SixGe1-x)(3) plates in RE5(SixGe1-x)(4) alloys, where RE = Gd and Ho. Intermetallics. 18:1021-1026. abstract
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Haldar A; Singh N K; Mudryk Y; Suresh K G; Nigam A K; Pecharsky V K . 2010. Temperature and magnetic field induced structural transformation in Si-doped CeFe2: An in-field X-ray diffraction study. Solid State Communications. 150:879-883. abstract
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Lu S G; Fang Z; Furman E; Wang Y; Zhang Q M; Mudryk Y; Gschneidner K A; Pecharsky V K; Nan C W . 2010. Thermally mediated multiferroic composites for the magnetoelectric materials. Applied Physics Letters. 96:102902. abstract
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Zhang H; Mudryk Y; Cao Q; Pecharsky V K; Gschneidner K A; Long Y . 2010. Phase relationships, and structural, magnetic, and magnetocaloric properties in the Ce5Si4-Ce5Ge4 system. Journal of Applied Physics. 107:013909. abstract
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2009
Zou M; Pecharsky V K; Gschneidner K A; Schlagel D L; Lograsso T A . 2009. Spontaneous generation of voltage in the magnetocaloric compound Tb5Si2.2Ge1.8 and elemental Gd. Journal of Alloys and Compounds. 488:550-553. abstract
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Khan M; Gschneidner K A; Pecharsky V K . 2009. Multiple magnetic ordering phenomena evaluated by heat capacity measurements in Er1-xTbxAl2 Laves-phase alloys. Physical Review B. 80:224408. abstract
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Zhang H; Mudryk Y; Zou M; Pecharsky V K; Gschneidner K A; Long Y . 2009. Phase relationships and crystallography of annealed alloys in the Ce5Si4-Ce5Ge4 pseudobinary system. Journal of Alloys and Compounds. 487:98-102. abstract
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Singh N K; Kumar P; Mao Z; Paudyal D; Neu V; Suresh K G; Pecharsky V K; Gschneidner K A . 2009. Magnetic, magnetocaloric and magnetoresistance properties of Nd7Pd3. Journal of Physics-Condensed Matter. 21:456004. abstract
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Zou M; Pecharsky V K; Gschneidner K A; Mudryk Y; Schlagel D L; Lograsso T A . 2009. Electrical resistivity and magnetoresistance of single-crystal Tb5Si2.2Ge1.8. Physical Review B. 80:174411. abstract
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