Crystal Structure And Low Temperature Physical Properties Of Ho2 Co Ga8 Intermetallic Antiferromagnet

We have synthesized single crystalline samples of Ho2 Co Ga8 intermetallic compound using a Ga-flux method. This compound crystallizes with a tetragonal structure, space group P4mmm, and lattice parameters a=4.219 (5) Å and c=10.99 (2) Å. This structure is a bilayer version of the HoCo Ga5 (1-1-5) which hosts a series of heavy-fermion superconductors and complex antiferromagnetic intermetallic systems. Measurements of magnetic susceptibility, heat capacity, and electrical resistivity revealed that Ho2 Co Ga8 is a metallic Curie-Weiss paramagnet at high temperature and presents an antiferromagnetic ordering below TN ∼5 K. The low temperature magnetic properties of this compound show the effects of tetragonal crystalline electrical field and the Ruderman-Kittel-Kasuya-Yosid interactions and the results presented here are compared with a broader description of the evolution of the low- T magnetic properties of structurally related series of rare-earth based tetragonal 2-1-8 and 1-1-5 compounds. © 2008 American Institute of Physics.1037Continentino, M.A., V. Löhneysen, H., Rosch, A., Vojta, M., Wölfle, P., (2005) Braz. J. Phys., 35, p. 197. , 0103-9733 10.1590/S0103-97332005000100018, ();, Rev. Mod. Phys. 79, 1015 (2007)Thompson, J.D., Movshovich, R., Fisk, Z., Bouquet, F., Curro, N.J., Fisher, R.A., Hammel, P.C., Sarrao, J.L., (2001) J. Magn. Magn. Mater., 226-230, p. 5. , and references thereinPagliuso, P.G., Movshovich, R., Bianchi, A.D., Nicklas, M., Moreno, N.O., Thompson, J.D., Hundley, M.F., Fisk, Z., (2002) Physica B, 312-313, p. 129Moreno, N.O., Hundley, M.F., Pagliuso, P.G., Movshovich, R., Nicklas, M., Thompson, J.D., Sarrao, J.L., Fisk, Z., (2002) Physica B, 312-313, p. 274Bianchi, A., Movshovich, R., Vekhter, I., Pagliuso, P.G., Sarrao, J.L., (2003) Phys. Rev. Lett., 91, p. 257001Sarrao, J.L., Morales, L.A., Thompson, J.D., Scott, B.L., Stewart, G.R., Wastin, F., Rebizant, J., Lander, G.H., (2002) Nature (London), 420, p. 297Bauer, E.D., Thompson, J.D., Sarrao, J.L., Morales, L.A., Wastin, F., Rebizant, J., Griveau, J.C., Stewart, G.R., (2004) Phys. Rev. Lett., 93, p. 147005Pagliuso, P.G., Garcia, D.J., Miranda, E., Granado, E., Lora-Serrano, R., Giles, C., Duque, J.G.S., Rettori, C., (2006) J. Appl. Phys., 99, pp. 08P703. , and references thereinGranado, E., Uchoa, B., Malachias, A., Lora-Serrano, R., Pagliuso, P.G., Westfahl Jr., H., (2006) Phys. Rev. B, 74, p. 214428Lora-Serrano, R., Giles, C., Granado, E., Garcia, D.J., Miranda, E., Agüero, O., Mendoņa Ferreira, L., Pagliuso, P.G., (2006) Phys. Rev. B, 74, p. 214404Hieu, N.V., Shishido, H., Nakashima, H., Sugiyama, K., Settai, R., Takeuchi, T., Matsuda, T.D., Nuki, Y., (2007) J. Magn. Magn. Mater., 310, p. 1721Hudis, J., Hu, R., Broholm, C.L., Mitrovic, V.F., Petrovic, C., (2006) J. Magn. Magn. Mater., 307, p. 301Yokaichiya, F., Giles, C., (2004) Physica B, 345, p. 82Yu, G., Yarmolyuk, Ya.P., Gladyshevskii, E.I., (1979) Kristallografiya, 24, p. 242Bao, W., Pagliuso, P.G., Sarrao, J.L., Thompson, J.D., Fisk, Z., (2001) Phys. Rev. B, 64, p. 020401. , (R)Adriano, C., Lora-Serrano, R., Giles, C., De Bergevin, F., Lang, J.C., Srajer, G., Mazzoli, C., Pagliuso, P.G., (2007) Phys. Rev. B, 76, p. 104515Amara, M., Gaĺra, R.M., Morin, P., Voiron, J., Burlet, P., (1995) J. Magn. Magn. Mater., 140-144, p. 1157Kletowski, Z., Slawinski, P., (1990) Solid State Commun., 76, p. 867Czopnik, A., (1995) Phys. Status Solidi A, 147, p. 3