High-magnetic field x-ray diffraction studies on Gd5(Ge 2-xFex)Si2 (x = 0.05 and 0.2)

Jim Long Her; Keiichi Koyama; Kazuo Watanabe; Virgil Provenzano; Anqi Fu; Alexander J. Shapiro; Robert D. Shull

doi:10.2320/matertrans.46.2011

High-magnetic field x-ray diffraction studies on Gd₅(Ge _2-xFe_x)Si₂ (x = 0.05 and 0.2)

Jim Long Her, Keiichi Koyama, Kazuo Watanabe, Virgil Provenzano, Anqi Fu, Alexander J. Shapiro, Robert D. Shull

High Field Laboratory for Superconducting Materials

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

We performed the powder X-ray diffraction measurements in magnetic fields up to 5 T for Gd₅(Ge_1.95Fe_0.05)Si₂ and Gd₅(Ge_1.8Fe_0.2)Si₂. With heating from 8 K, the matrix of Gd₅(Ge_1.95Fe_0.05) Si₂ clearly shows a structural transition from an orthorhombic to a monoclinic structure at the Curie temperature (T_C = 276 K). On the other hand, the matrix of Gd₅(Ge_1.8Fe_0.2) Si₂ with the orthorhombic structure in the ferromagnetic state shows two-phases co-existence of the orthorhombic and the monoclinic structures above T_C = 303 K, indicating that a small amount of the matrix participates in the transformation. For both samples, the monoclinic structure is suppressed but the orthorhombic structure is enhanced just above T_C by applying a magnetic field, which closely relates to the magnetization process.

Original language	English
Pages (from-to)	2011-2014
Number of pages	4
Journal	Materials Transactions
Volume	46
Issue number	9
DOIs	https://doi.org/10.2320/matertrans.46.2011
Publication status	Published - 2005 Sep

Keywords

Field-induced structural transformation
GdGeSi compound
High field X-ray diffraction
Magnetic refrigeration materials
Meta magnetic transition

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.2320/matertrans.46.2011

Cite this

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title = "High-magnetic field x-ray diffraction studies on Gd5(Ge 2-xFex)Si2 (x = 0.05 and 0.2)",

abstract = "We performed the powder X-ray diffraction measurements in magnetic fields up to 5 T for Gd5(Ge1.95Fe0.05)Si2 and Gd5(Ge1.8Fe0.2)Si2. With heating from 8 K, the matrix of Gd5(Ge1.95Fe0.05) Si2 clearly shows a structural transition from an orthorhombic to a monoclinic structure at the Curie temperature (TC = 276 K). On the other hand, the matrix of Gd5(Ge1.8Fe0.2) Si2 with the orthorhombic structure in the ferromagnetic state shows two-phases co-existence of the orthorhombic and the monoclinic structures above TC = 303 K, indicating that a small amount of the matrix participates in the transformation. For both samples, the monoclinic structure is suppressed but the orthorhombic structure is enhanced just above TC by applying a magnetic field, which closely relates to the magnetization process.",

keywords = "Field-induced structural transformation, GdGeSi compound, High field X-ray diffraction, Magnetic refrigeration materials, Meta magnetic transition",

author = "Her, {Jim Long} and Keiichi Koyama and Kazuo Watanabe and Virgil Provenzano and Anqi Fu and Shapiro, {Alexander J.} and Shull, {Robert D.}",

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AU - Her, Jim Long

AU - Koyama, Keiichi

AU - Watanabe, Kazuo

AU - Provenzano, Virgil

AU - Fu, Anqi

AU - Shapiro, Alexander J.

AU - Shull, Robert D.

PY - 2005/9

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N2 - We performed the powder X-ray diffraction measurements in magnetic fields up to 5 T for Gd5(Ge1.95Fe0.05)Si2 and Gd5(Ge1.8Fe0.2)Si2. With heating from 8 K, the matrix of Gd5(Ge1.95Fe0.05) Si2 clearly shows a structural transition from an orthorhombic to a monoclinic structure at the Curie temperature (TC = 276 K). On the other hand, the matrix of Gd5(Ge1.8Fe0.2) Si2 with the orthorhombic structure in the ferromagnetic state shows two-phases co-existence of the orthorhombic and the monoclinic structures above TC = 303 K, indicating that a small amount of the matrix participates in the transformation. For both samples, the monoclinic structure is suppressed but the orthorhombic structure is enhanced just above TC by applying a magnetic field, which closely relates to the magnetization process.

AB - We performed the powder X-ray diffraction measurements in magnetic fields up to 5 T for Gd5(Ge1.95Fe0.05)Si2 and Gd5(Ge1.8Fe0.2)Si2. With heating from 8 K, the matrix of Gd5(Ge1.95Fe0.05) Si2 clearly shows a structural transition from an orthorhombic to a monoclinic structure at the Curie temperature (TC = 276 K). On the other hand, the matrix of Gd5(Ge1.8Fe0.2) Si2 with the orthorhombic structure in the ferromagnetic state shows two-phases co-existence of the orthorhombic and the monoclinic structures above TC = 303 K, indicating that a small amount of the matrix participates in the transformation. For both samples, the monoclinic structure is suppressed but the orthorhombic structure is enhanced just above TC by applying a magnetic field, which closely relates to the magnetization process.

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KW - Magnetic refrigeration materials

KW - Meta magnetic transition

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