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

2009
Hale L; Gschneidner K A; Pecharsky V K; Mudryk Y . 2009. Low temperature properties of some RIn3 compounds. Journal of Alloys and Compounds. 472:24-29. abstract
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Singh N K; Paudyal D; Mudryk Y; Pecharsky V K; Gschneidner K A . 2009. Magnetostructural transition in Ho5Ge4. Physical Review B. 79:094115. abstract
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Gschneidner K A . 2009. The magnetocaloric effect, magnetic refrigeration and ductile intermetallic compounds. Acta Materialia. 51:18-28. abstract
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Misra S; Poweleit E T; Miller G J . 2009. On the Crystal Structure, Metal Atom Site Preferences and Magnetic Properties of Nd(5-x)Er(x)Tt(4) (Tt = Si or Ge). Zeitschrift Fur Anorganische Und Allgemeine Chemie. 635:889-897. abstract
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2008
Roy S B; Chaddah P; Pecharsky V K; Gschneidner K A . 2008. Overview No. 145 Metamagnetic transitions, phase coexistence and metastability in functional magnetic materials. Acta Materialia. 56:5895-5906. abstract
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Tseng Y C; Haskel D; Souza-Neto N M; Mudryk Y; Pecharsky V K; Gschneidner K A . 2008. Pressure-induced removal of magnetostructural inhomogeneity in Ge-rich Gd-5(SixGe1-x)(4) giant magnetocaloric alloys. Physical Review B. 78:214433. abstract
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Moore J D; Perkins G K; Morrison K; Ghivelder L; Chattopadhyay M K; Roy S B; Chaddah P; Gschneidner K A; Pecharsky V K; Cohen L F . 2008. Local probing of arrested kinetics in Gd5Ge4. Journal of Physics-Condensed Matter. 20:465212. abstract
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Tarafder K; Rahaman M; Paudyal D; Sanyal B; Eriksson O; Mookerjee A . 2008. Study of phase stability in a class of binary alloys using augmented space recursion based orbital peeling technique. Physica B-Condensed Matter. 403:4111-4119. abstract
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Paudyal D; Mudryk Y; Lee Y B; Pecharsky V K; Gschneidner K A J; Harmon B N . 2008. Understanding the extraordinary magnetoelastic behavior in GdNi. Physical Review B. 78:184436. abstract
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Misra S; Miller G J . 2008. Gd(5-x)Y(x)Tt(4) (Tt = Si or Ge): Effect of metal substitution on structure, bonding, and magnetism. Journal of the American Chemical Society. 130:13900-13911. abstract
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