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2004 | 2 | 2 | 397-418
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Magnetic phases in UNi2Si2

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The tetragonal compound UNi2Si2 exhibits in zero magnetic field three different antiferromagnetic phases belowT N=124 K. They are formed by ferromagnetic basal planes, which are antiferromagnetically coupled along thec-axis with the propagation vectorq=(0, 0, q z). Two additional order-order magnetic phase transitions are observed below T N, namely atT 1=108 K and T 2=40 K in zero magnetic field. All three phases exhibit strong uniaxial anisotropy confining the U moments to a direction parallel to the c-axis. UNi2Si2 single crystals were studied in detail by measuring bulk thermodynamic properties, such as thermal expansion, resistivity, susceptibility, and specific heat. A microscopic study using neutron diffraction was performed in magnetic fields up to 14.5 T parallel to the c-axis, and a complex magnetic phase diagram has been determined. Here, we present the analysis of specific-heat data measured in magnetic fields up to 14 T compared with the results of the neutron-diffraction study and with other thermodynamic properties of UNi2Si2.
Wydawca

Czasopismo
Rocznik
Tom
2
Numer
2
Strony
397-418
Opis fizyczny
Daty
wydano
2004-06-01
online
2004-06-01
Twórcy
  • Department of Electronic Structures, Charles University, Ke Karlovu 5, 121 16, Prague 2, The Czech Republic, svoboda@mag.mff.cuni.cz
  • Department of Electronic Structures, Charles University, Ke Karlovu 5, 121 16, Prague 2, The Czech Republic
  • Department of Electronic Structures, Charles University, Ke Karlovu 5, 121 16, Prague 2, The Czech Republic
  • Department of Electronic Structures, Charles University, Ke Karlovu 5, 121 16, Prague 2, The Czech Republic
  • Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE, Amsterdam, The Netherlands
Bibliografia
  • [1] V. Sechovský and L. Havela: “Magnetism of ternary compounds of uranium”, In: K.H.J. Buschow (Ed.): Handbook of Magnetic Materials, Elsevier, Amsterdam, Vol. 11, (1998), pp. 1–289 and references therein.
  • [2] H. Lin, L. Rebelsky, M.F. Collins, J.D. Garrett and W.J.L. Buyers: “Magnetic Structure of UNi2Si2”, Phys. Rev. B, Vol. 43, (1991), pp. 13232–13239. http://dx.doi.org/10.1103/PhysRevB.43.13232[Crossref]
  • [3] L. Rebelsky, H. Lin, M.W. McElfresh, M.F. Collins, J.D. Garrett, W.J.L. Buyers and M.S. Torikachvili: “The Magnetic Phase Diagram of UNi2Si2”, Physica B, Vol. 180 & 181, (1992), pp. 43–45. http://dx.doi.org/10.1016/0921-4526(92)90654-B[Crossref]
  • [4] P. Svoboda, P. Javorský, V. Sechovský, A.A. Menovsky, M. Hofmann and N. Stuesser: “Magnetic phase diagram and critical scattering of UNi2Si2”, Physica B, Vol. 322, (2002), pp. 248–251. http://dx.doi.org/10.1016/S0921-4526(02)01189-4[Crossref]
  • [5] P. Svoboda, P. Javorský, V. Sechovský, and A.A. Menovsky: “Magnetic phase diagram of UNi2Si2 in high fields”, Physica B, Vol. 276–278, (2000), pp. 686–687. http://dx.doi.org/10.1016/S0921-4526(99)01709-3[Crossref]
  • [6] “PPMS-Physical Property Measurement System”, Quantum Design, San Diego, 1999.
  • [7] P. Svoboda, P. Javorský, M. Diviš, V. Sechovský, F. Honda, G. Oomi and A.A. Menovsky: “Importance of anharmonic terms in the analysis of the specific heat of UNi2Si2-art. no. 212408”, Phys. Rev. B, Vol. 63, (2001), pp. 212408-1–212408-4. http://dx.doi.org/10.1103/PhysRevB.63.212408[Crossref]
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_BF02475639
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