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

2011
Khan M; Mudryk Y; Gschneidner K A; Pecharsky V K . 2011. Magnetism of Ho(1-x)Tb(x)Al(2) alloys: Critical dependence of a first-order transition on Tb concentration. Physical Review B. 84:214437. abstract
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Mudryk Y; Pecharsky V K; Gschneidner K A . 2011. Extraordinary Responsive Intermetallic Compounds: the R(5)T(4) Family (R = Rare Earth, T = Group 13-15 Element). Zeitschrift Fur Anorganische Und Allgemeine Chemie. 637:1948-1956. abstract
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Khan M; Gschneidner K A; Pecharsky V K . 2011. Spin reorientation transitions in Ho(1-x)Dy(x)Al(2) alloys. Journal of Applied Physics. 110:103912. abstract
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Khan M; Schlagel D L; Lograsso T A; Gschneidner K A; Pecharsky V K . 2011. Magnetic and thermal properties of Er(75)Dy(25) single crystals. Physical Review B. 84:134424. abstract
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Zverev V I; Gimaev R R; Tishin A M; Mudryk Y; Gschneidner K A; Pecharsky V K . 2011. The role of demagnetization factor in determining the 'true' value of the Curie temperature. Journal of Magnetism and Magnetic Materials. 323:2453-2457. abstract
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Ritter C; Provino A; Manfrinetti P; Gschneidner K A . 2011. The magnetic structures of RMgSn compounds (R = Ce, Pr, Nd, Tb). Journal of Alloys and Compounds. 509:9724-9732. abstract
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Cao Q; Chumbley L S . 2011. Electron microscopy studies of lutetium doped erbium silicide (Er(0.9)Lu(0.1))(5)Si(4). Materials Characterization. 62:737-741. abstract
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Paudyal D; Mudryk Y; Pecharsky V K; Gschneidner K A . 2011. Electronic structure, magnetic properties, and magnetostructural transition in Tb(5)Si(2.2)Ge(1.8) from first principles. Physical Review B. 84:014421. abstract
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Zhong X C; Tang P F; Liu Z W; Zeng D C; Zheng Z G; Yu H Y; Qiu W Q; Zou M . 2011. Magnetic properties and large magnetocaloric effect in Gd-Ni amorphous ribbons for magnetic refrigeration applications in intermediate temperature range. Journal of Alloys and Compounds. 509:6889-6892. abstract
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Fu H; Zou M; Cao Q; Pecharsky V K; Gschneidner K A; Chumbley L S . 2011. Microstructure and magnetocaloric effects in partially amorphous Gd55Co15Al30-xSix alloys. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing. 528:5219-5222. abstract
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