Abstract.
CeAgGa crystallizes in CeCu2 Imma structure with Ag and Ga atoms randomly distributed at 8h sites. The magnetic and transport properties of the orthorhombic CeAgGa compound have been obtained from the analysis of ac magnetic susceptibility χ ac , magnetization M vs. magnetic field, specific heat C and electrical resistivity ρ. The results provide evidence for the formation of a spin-glass state with a freezing temperature T f = 5.1 K. The randomness in the Ce-Ce magnetic exchange interactions seem to arise from a statistical distribution of Ag and Ga atoms on a crystallographic site of the CeAgGa crystal lattice. The results provide also evidence for the formation of ferromagnetic-like order at the temperature T C ≈ 3.6 K. Band structure calculations for a disordered system give magnetic moment similar to saturation moment obtained from magnetization measurements, however, its calculated value is insensitive on Ga/Ag off-stoichiometry in the 8h position. Complex behavior of CeAgGa Kondo-lattice compound is discussed in terms of interplaying Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions, Kondo effect and structural disorder.
Similar content being viewed by others
References
S. Doniach, Valence Instabilities and Related Narrow Band Phenomena, edited by R.D. Parks (Plenum, New York, 1977), p. 169
J. Sakurai, S. Nakatani, A. Adam, H. Fujiwara, J. Magn. Magn. Mater. 108, 143 (1992)
T. Takabatake, F. Teshima, H. Fujii, S. Nishigori, T. Suzuki, T. Fujita, Y. Yamaguchi, J. Sakurai, D. Jaccard, Phys. Rev. B 41, 9607 (1990)
A. Szytuła, Crystal structures and magnetic properties of RTX rare earth intermetallics, edited by J. Hrycyk (Jagiellonian University Press, Kraków, 1998)
R.V. Gumeniuk, L.G. Akselrud, B.M. Stelmakhovych, Yu.B. Kuzma, J. Alloys Compd. 389, 127 (2005)
D.T. Adroja, B.D. Rainford, S.K. Malik, Physica B 186-188, 566 (1993)
S.K. Malik, B.D. Dunlop, A.E. Dwight, J. Less- Common Met. 127, 261 (1987)
D. Rossi, R. Ferro, J. Alloys Compd. 317-318, 521 (2001)
A. Ślebarski, D. Kaczorowski, W. Głogowski, J. Goraus, J. Phys.: Condens. Matter 20, 315208 (2008)
J. Rodriguez-Carvajal, Physica B 192, 55 (1993)
K. Koepernik, H. Eschrig, Phys. Rev. B 59, 1743 (1999)
I. Opahle, K. Koepernik, H. Eschrig, Phys. Rev. B 60, 14035 (1999)
K. Koepernik, B. Velicky, R. Hayn, H. Eschrig, Phys. Rev. B 55, 5717 (1997)
H. Eschrig, M. Richter, I. Opahle, Relativistic Solid State Calculations, in Relativistic Electronic Structure Theory, Theoretical and Computational Chemistry Part 2. Applications, edited by P. Schwerdtfeger, (Elsevier, 2004), Vol. 13, pp. 723–776
H. Eschrig, K. Koepernik, I. Chaplygin, J. Solid State Chem. 176, 482 (2003)
J.P. Perdew, Y. Wang, Phys. Rev. B 45, 13244 (1992)
D.M. Ceperley, B.J. Alder, Phys. Rev. Lett. 45, 566 (1980)
A.C. Hewson, The Kondo Problem to Heavy Fermions (Cambridge University Press, Cambridge, 1993)
J.A. Mydosh, Spin Glasses: An Experimental Introduction (Taylor and Francis, London, 1993)
J.L. Tholence, Solid State Commun. 35, 113 (1980)
K.G. Suresh, S.K. Dhar, A.K. Nigam, J. Magn. Magn. Mater. 288, 452 (2005)
S. Süllow, G.J. Nieuwenhuys, A.A. Menovsky, J.A. Mydosh, S.A.M. Mentink, T.E. Mason, W.J.L. Buyers, Phys. Rev. Lett. 78, 354 (1997)
D.X. Li, Y. Shiokawa, Y. Homma, A. Uesawa, A. Dönni, T. Suzuki, Y. Haga, E. Yamamoto, T. Honma, Y. Onuki, Phys. Rev. B 57, 7434 (1998)
J.G. Sereni, Rev. Bras. Fis. 21, 280 (1991)
A. Landelli, A.P. Palenzona, J. Less-Common Met. 15, 272 (1968)
H. Yashima, H. Mori, N. Sato, T. Satoh, J. Magn. Magn. Mater. 31-34, 411 (1983)
N.F. Mott, H. Jones, The Theory of the Properties of Metals and Alloys (Oxford University Press, 1958), p. 240
A. Ślebarski, J. Alloys Compd. 480, 9 (2009)
J.G. Soldevilla, J.C.G. Sal, J.A. Blanco, J.I. Espreso, J. Rodriguez Fernandez, Phys. Rev. B 61, 6821 (2000)
B. Coqblin, J.R. Iglesias, S.G. Magalhaes, N.B. Perkins, F.M. Zimmer, J. Optoelectronics Adv. Mater. 10, 1583 (2008)
B. Coqblin, Acta Physica Polonica A 115, 13 (2009)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Goraus, J., Ślebarski, A., Fijałkowski, M. et al. Inhomogenous magnetic ground state in CeAgGa. Eur. Phys. J. B 80, 65–71 (2011). https://doi.org/10.1140/epjb/e2011-10726-9
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1140/epjb/e2011-10726-9