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- W1997173645 abstract "The magnetic ordering in the ${mathrm{Eu}}_{4}{mathrm{Ga}}_{8}{mathrm{Ge}}_{16}$ clathrate compound was studied using magnetic susceptibility, Mossbauer spectroscopy, and heat-capacity measurements. Antiferromagnetic ordering is observed at 8 K. Mossbauer spectroscopy shows the Eu atoms to exist as ${mathrm{Eu}}^{2+}$ with strong room-temperature absorption at -11.8 mm/s vs ${mathrm{EuF}}_{3}.$ The temperature dependence of the Lamb-Mossbauer factor can be fitted to an Einstein model with an effective Einstein temperature of 80 K. In combination with heat-capacity measurements, this result suggests that the Eu atoms behave like isolated oscillators that are effectively decoupled from the lattice. The magnetic susceptibility data are interpreted using the Curie-Weiss law for ordering with ${ensuremath{mu}}_{ensuremath{parallel},mathrm{eff}}=8.00ifmmodepmelsetextpmfi{}0.03{ensuremath{mu}}_{B}/{mathrm{Eu}}^{2+}$ ion and $ensuremath{theta}=4.43ifmmodepmelsetextpmfi{}0.08mathrm{K}.$ The positive Weiss constant is rationalized by a nearest-neighbor ferromagnetic exchange interaction within an overall antiferromagnetically ordered system. The spin-flop phase diagram is established and used to extract the next-nearest-neighbor interaction energy. The location of the tri-critical point in H,T space is determined. The magnetic heat capacity ${C}_{m}$ is extracted by modeling the lattice contribution using a weighted Debye-Einstein model with fitted Debye temperature ${ensuremath{Theta}}_{D}=314ifmmodepmelsetextpmfi{}4mathrm{K}$ and using a fixed Einstein temperature ${ensuremath{Theta}}_{E}=80mathrm{K}.$ Integration of ${C}_{m}/T$ gave 15.1 J/K mol ${mathrm{Eu}}^{2+}$ in fair accordance with expectations based on configurational considerations." @default.
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- W1997173645 date "2003-11-25" @default.
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- W1997173645 title "Magnetic phase diagram of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Eu</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ga</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ge</mml:mi></mml:mrow><mml:mrow><mml:mn>16</mml:mn></mml:…" @default.
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- W1997173645 doi "https://doi.org/10.1103/physrevb.68.174429" @default.
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