Gabáni, S.; Batko, I.; Batkova, M.; Flachbart, K.; Gazo, E.; Reiffers, M.; Shitsevalova, N.; Siemensmeyer, K.; Shuchanko, N.: Influence of Lu - substitution on the frustrated antiferromagnetic system HoB12. Solid State Sciences 14 (2012), p. 1722-1724
10.1016/j.solidstatesciences.2012.08.001
Open Access Version
Abstract:
In this contribution we present results of experimental investigations of the geometrically frustrated metallic antiferromagnet HoB12 (with ordering temperature TN = 7.4 K) influenced by substitution of magnetic Ho atoms through nonmagnetic Lu ones. In this case, in Ho1-xLuxB12 solid solutions, both chemical pressure and magnetic dilution take place with increasing content of Lu which changes the properties of the system. Experimentally, measurements of heat capacity and electrical resistivity of these solid solutions were performed from room temperature down to milikelvin temperatures and in magnetic fields up to 9 T. This wide range of experimental conditions allowed us among other things to follow the change of magnetic ordering temperature with concentration (x), i.e. to obtain the TN vs. x phase diagram. The received results show strong indications for the existence of a quantum critical point (QCP) close to xc ≈ 0.9. This critical point separates the region of magnetic order (starting with HoB12 for x = 0) and the nonmagnetic region (ending with superconducting LuB12 for x = 1).