Bulk properties of UIr$sub 2$ and UIr$sub 3$

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The electrical resistivity and magnetic susceptibility of the cubic intermetallic compounds UIr$sub 2$ (MgCu$sub 2$-type) and UIr$sub 3$ (ordered, AuCu$sub 3$-type) were measured between 2-300$sup 0$K. The susceptibility of UIr$sub 3$ is temperature independent and substantially lower than that of isoelectronic URh$sub 3$, being 0.57 vs 0.97 x 10$sup -3$ emu/mole at room temperature. The susceptibility of UIr$sub 2$ is very weakly temperature dependent above 100$sup 0$K and has a value of 1.18 x 10$sup -3$ emu/mole at room temperature. The electrical resistivities of both compounds follow power law dependences at low temperatures, of the form rho-rho$sub 0$ = AT/sup ... continued below

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Brodsky, M.B.; Trainor, R.J.; Arko, A.J. & Culbert, H.V. December 1, 1975.

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The electrical resistivity and magnetic susceptibility of the cubic intermetallic compounds UIr$sub 2$ (MgCu$sub 2$-type) and UIr$sub 3$ (ordered, AuCu$sub 3$-type) were measured between 2-300$sup 0$K. The susceptibility of UIr$sub 3$ is temperature independent and substantially lower than that of isoelectronic URh$sub 3$, being 0.57 vs 0.97 x 10$sup -3$ emu/mole at room temperature. The susceptibility of UIr$sub 2$ is very weakly temperature dependent above 100$sup 0$K and has a value of 1.18 x 10$sup -3$ emu/mole at room temperature. The electrical resistivities of both compounds follow power law dependences at low temperatures, of the form rho-rho$sub 0$ = AT/sup n/, with n = 1.9 for UIr$sub 2$ and n = 3.7 for UIr$sub 3$. These results indicate that UIr$sub 2$ may be a spin fluctuation compound, while UIr$sub 3$ behaves as a simple transition metal compound, with even less d-f character than URh$sub 3$ (n = 3.0). The specific heat of UIr$sub 2$ was measured between 1-4K and may be fit to C =$gamma$T + $beta$T$sup 3$, with a large value of $gamma$, 62.5 mJ/(mole- K$sup 2$), which is consistent with a narrow 5f band at the Fermi level. The lack of any magnetic phenomena in UIr$sub 3$ is explained by the hybridization of the 5f electrons into f-d bands, which mostly lie below the Fermi level. (auth)

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7 p.

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Dep. NTIS

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  • 21. annual conference on magnetism and magnetic materials, Philadelphia, Pennsylvania, USA, 9 Dec 1975

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  • Report No.: CONF-751209--7
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 4145294
  • Archival Resource Key: ark:/67531/metadc864907

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  • December 1, 1975

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 11, 2017, 2:07 p.m.

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Brodsky, M.B.; Trainor, R.J.; Arko, A.J. & Culbert, H.V. Bulk properties of UIr$sub 2$ and UIr$sub 3$, article, December 1, 1975; Illinois. (digital.library.unt.edu/ark:/67531/metadc864907/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.