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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Zverev V I; Tishin A M; Chernyshov A S; Mudryk Y; Gschneidner K A; Pecharsky V K . 2014. Magnetic and magnetothermal properties and the magnetic phase diagram of high purity single crystalline terbium along the easy magnetization direction. Journal of Physics-Condensed Matter. 26:066001. abstract
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Provino A; Paudyal D; Morozkin A V; Manfrinetti P; Gschneidner K A . 2014. Systematics and anomalies in formation and crystal structures of RScSb and R3Sc2Sb3 rare earth compounds. Journal of Alloys and Compounds. 587:783-789. abstract
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Maurya A; Thamizhavel A; Provino A; Pani M; Manfrinetti P; Paudyal D; Dhar S K . 2014. Synthesis, Crystal and Electronic Structure of the Quaternary Magnetic EuTAl4Si2 (T = Rh and Ir) Compounds. Inorganic Chemistry. 53:1443-1448. abstract
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Cao Q; Chumbley L S . 2013. Characterization of second-phase plates in a Gd5Ge3 intermetallic compound. Microscopy. 62:629-638. abstract
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Marcano N; Algarabel P A; Fernandez J R; Magen C; Morellon L; Singh N K; Gschneidner K A; Pecharsky V K; Ibarra M R . 2013. Effects of pressure on the magnetic-structural and Griffiths-like transitions in Dy5Si3Ge. Physical Review B. 88:214429. abstract
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Paudyal D; Pathak A K; Pecharsky V K; Gschneidner K A . 2013. Understanding and prediction of electronic-structure-driven physical behaviors in rare-earth compounds. Journal of Physics-Condensed Matter. 25:396002. abstract
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Xie W W; Thimmaiah S; Lamsal J; Liu J; Heitmann T W; Quirinale D; Goldman A I; Pecharsky V; Miller G J . 2013. beta-Mn-Type Co8+xZn12-x as a Defect Cubic Laves Phase: Site Preferences, Magnetism, and Electronic Structure. Inorganic Chemistry. 52:9399-9408. abstract
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Tseng Y C; Paudyal D; Mudryk Y; Pecharsky V K; Gschneidner K A; Haskel D . 2013. Electronic contribution to the enhancement of the ferromagnetic ordering temperature by Si substitution in Gd-5(SixGe1-x)(4). Physical Review B. 88:054428. abstract
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Zou J D; Liu J; Mudryk Y; Pecharsky V K; Gschneidner K A . 2013. Ferromagnetic ordering and Griffiths-like phase behavior in Gd5Ge3.9Al0.1. Journal of Applied Physics. 114:063904. abstract
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Liu J; Paudyal D; Mudryk Y; Zou J D; Gschneidner K A; Pecharsky V K . 2013. Unusual magnetic and structural transformations of DyFe4Ge2. Physical Review B. 88:014423. abstract
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