Thermal properties of U3Al2Si3 single crystal
Heat capacity data of U3Al2Si3 single crystal exhibit a maximum at 38 K connected with a transition to a magnetically ordered state. For a full description of the electron part we used γ 0 = 145 mJ/mol K2 and for the phonon part of the specific heat we used the harmonic approximation of the phonon s...
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| Published in: | Physica Status Solidi (b) Vol. 243; no. 1; pp. 304 - 308 |
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WILEY-VCH Verlag
01-01-2006
WILEY‐VCH Verlag |
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| Abstract | Heat capacity data of U3Al2Si3 single crystal exhibit a maximum at 38 K connected with a transition to a magnetically ordered state. For a full description of the electron part we used γ 0 = 145 mJ/mol K2 and for the phonon part of the specific heat we used the harmonic approximation of the phonon spectrum including both the Debye model with T D = 296 K and the Einstein model with T E = 136, 249 and 438 K. The heat capacity data below the magnetic transition down to 2 K fit very well within the model introducing the energy gap Δ = 39 K in the dispersion relation of magnons. An upturn of the C /T (T ) curve, found below T = 2 K, can not be fully attributed to the nuclear Schottky contribution. The electronic heat capacity coefficient (γ ≈ 230 mJ/mol K2 is enhanced and varies between 0.15 K and 12 K as the square root of T . (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
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| AbstractList | Heat capacity data of U3Al2Si3 single crystal exhibit a maximum at 38 K connected with a transition to a magnetically ordered state. For a full description of the electron part we used γ 0 = 145 mJ/mol K2 and for the phonon part of the specific heat we used the harmonic approximation of the phonon spectrum including both the Debye model with T D = 296 K and the Einstein model with T E = 136, 249 and 438 K. The heat capacity data below the magnetic transition down to 2 K fit very well within the model introducing the energy gap Δ = 39 K in the dispersion relation of magnons. An upturn of the C /T (T ) curve, found below T = 2 K, can not be fully attributed to the nuclear Schottky contribution. The electronic heat capacity coefficient (γ ≈ 230 mJ/mol K2 is enhanced and varies between 0.15 K and 12 K as the square root of T . (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) Heat capacity data of U3Al2Si3 single crystal exhibit a maximum at 38 K connected with a transition to a magnetically ordered state. For a full description of the electron part we used 0 = 145 mJ/mol K2 and for the phonon part of the specific heat we used the harmonic approximation of the phonon spectrum including both the Debye model with T D = 296 K and the Einstein model with T E = 136, 249 and 438 K. The heat capacity data below the magnetic transition down to 2 K fit very well within the model introducing the energy gap = 39 K in the dispersion relation of magnons. An upturn of the C /T (T ) curve, found below T = 2 K, can not be fully attributed to the nuclear Schottky contribution. The electronic heat capacity coefficient ( 230 mJ/mol K2 is enhanced and varies between 0.15 K and 12 K as the square root of T. |
| Author | Mihalik, Matúš Rogl, Peter Flachbart, Karol Maťaš, Slavomír Troć, Robert Mihalik, Marián Gabáni, Slavomír |
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| Copyright | Copyright © 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim |
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| References | M. Mihalik, P. F. Rogl, and A. A. Menovsky, Acta Phys. Slovaca 48, 815 (1998). R. Troć, P. Rogl, V. H. Tran, and A. Czopnik, J. Solid State Chem. 158, 227 (2001). A. Gukasov, P. Rogl, P. J. Brown, M. Mihalik, and A. A. Menovsky, J. Phys.: Condens. Matter 14, 8841 (2002). N. H. Anderson and H. Smith, Phys. Rev. B 19, 384 (1979). M. Mihalik, S. Matas, M. Zentkova, Z. Arnold, O. Mikulina, and P. Rogl, Czech. J. Phys. A 52, 249 (2002). J. Šebek, M. Mihalik, O. Syshenko, and M. Zentková, J. Nucl. Sci. Technol. 3(Suppl.), 176 (2002). T. Moriya and T. Takimo, J. Phys. Soc. Jpn. 64, 960 (1995). J. Szajek, J. A. Morkowski, A. Bajorek, G. Chelkovska, and R. Troć, J. Alloys Compd. 386, 75 (2004). M. Mihalik, V. Kavecansky, K. Wochowski, R. Troc, and P. Rogl, Czech. J. Phys. 54, D303 (2004). P. Svoboda, P. Javorský, M. Diviš, V. Sechovský, F. Honda, G. Oomi, and A. A. Menovsky, Phys. Rev. B 63, 2408 (2001). P. Rogl, G. André, F. Boure, and H. Noël, J. Magn. Magn. Mater. 191, 291 (1999). V. Kavecansky, P. Rogl, H. Noel, M. Mihalik, K. Wochowski, and R. Troc, J. Alloys Compd. 365, 173 (2004). F. Weitzer, M. Potel, H. Noël, and P. Rogl, Solid State Chem. 111, 267 (1994). 2004; 365 2004; 54 1995; 64 1998; 48 2004; 386 2002; 14 1979; 19 1994; 111 2002; 52 1999; 191 2002; 3 2001; 158 2001; 63 |
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| Snippet | Heat capacity data of U3Al2Si3 single crystal exhibit a maximum at 38 K connected with a transition to a magnetically ordered state. For a full description of... |
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| Title | Thermal properties of U3Al2Si3 single crystal |
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