Extraordinary Responsive Rare Earth Magnetic Materials


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


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.


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Gschneidner K A; Mudryk Y; Pecharsky V K . 2012. On the nature of the magnetocaloric effect of the first-order magnetostructural transition. Scripta Materialia. 67:572-577. abstract
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Yuce S; Barrio M; Emre B; Stern-Taulats E; Planes A; Tamarit J L; Mudryk Y; Gschneidner K A; Pecharsky V K; Manosa L . 2012. Barocaloric effect in the magnetocaloric prototype Gd5Si2Ge2. Applied Physics Letters. 101:071906. abstract
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Provino A; Mudryk Y; Paudyal D; Smetana V; Manfrinetti P; Pecharsky V K; Gschneidner K A; Corbett J D . 2012. Crystal structure of Tb5Ni2In4 and Y5Ni2In4, and magnetic properties of Dy5Ni2In4. Journal of Applied Physics. 111:07e122. abstract
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Bonilla C M; Calvo I; Herrero-Albillos J; Figueroa A I; Castan-Guerrero C; Bartolome J; Rodriguez-Velamazan J A; Schmitz D; Weschke E; Paudyal D; Pecharsky V K; Gschneidner K A; Bartolome F; Garcia L M . 2012. New magnetic configuration in paramagnetic phase of HoCo2. Journal of Applied Physics. 111:07e315. abstract
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Khan M; Gschneidner K A; Pecharsky V K . 2012. The effect of Er doping on the spin reorientation transition in Ho(1-x)Er(x)Al(2). Journal of Magnetism and Magnetic Materials. 324:1381-1384. abstract
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Mudryk Y; Singh N K; Pecharsky V K; Schlagel D L; Lograsso T A; Gschneidner K A . 2012. Magnetic and structural properties of single-crystalline Er5Si4. Physical Review B. 85:094432. abstract
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Velez S; Hernandez J M; Garcia-Santiago A; Tejada J; Pecharsky V K; Gschneidner K A; Schlagel D L; Lograsso T A; Santos P V . 2012. Anisotropic magnetic deflagration in single crystals of Gd5Ge4. Physical Review B. 85:054432. abstract
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Mudryk Y; Paudyal D; Pecharsky V K; Gschneidner K A . 2012. Low-temperature crystal structure and magnetic properties of Gd5Ge3. Physical Review B. 85:014116. abstract
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Marcano N; Algarabel P A; Fernandez J R; Magen C; Morellon L; Singh N K; Schlagel D L; Gschneidner K A; Pecharsky V K; Ibarra M R . 2012. Magnetism and magnetocaloric effect of single-crystal Er(5)Si(4) under pressure. Physical Review B. 85:024408. abstract
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Wang H; Wang F; Jones K; Miller G J . 2011. Chemical Pressure and Rare-Earth Orbital Contributions in Mixed Rare-Earth Silicides La(5-x)Y(x)Si(4) (0 <= x <= 5). Inorganic Chemistry. 50:12714-12723. abstract
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