Electrical resistivity study of CeZn11: Magnetic field and pressure phase diagram up to 5 GPa

Abstract

Thorough resistivity measurements on single crystals of CeZn11 under pressure p and magnetic field H are presented. At ambient pressure, CeZn11 orders antiferromagnetically at TN=2 K. The pressure dependence of the resistivity reveals an increase of the Kondo effect. We determine the pressure evolution of the magnetic exchange interaction between conduction and localized 4f electrons. It qualitatively reproduces the pressure evolution of the magnetic ordering temperature TO1 (with TO1=TN at ambient pressure). In addition to TO1, a new anomaly TO2appears under pressure. Both anomalies are found to increase with applied pressure up to 4.9 GPa, indicating that CeZn11 is far from a pressure induced quantum critical point. Complex T-H phase diagrams are obtained under pressure which reveal the instability of the ground state in this compound. Keywords Physics and Astronomy Disciplines Condensed Matter Physics CommentsThis article is from Physical Review B 88 (2013) Thorough resistivity measurements on single crystals of CeZn 11 under pressure p and magnetic field H are presented. At ambient pressure, CeZn 11 orders antiferromagnetically at T N = 2 K. The pressure dependence of the resistivity reveals an increase of the Kondo effect. We determine the pressure evolution of the magnetic exchange interaction between conduction and localized 4f electrons. It qualitatively reproduces the pressure evolution of the magnetic ordering temperature T O 1 (with T O 1 = T N at ambient pressure). In addition to T O 1 , a new anomaly T O 2 appears under pressure. Both anomalies are found to increase with applied pressure up to 4.9 GPa, indicating that CeZn 11 is far from a pressure induced quantum critical point. Complex T -H phase diagrams are obtained under pressure which reveal the instability of the ground state in this compound.

Quantum tricritical point in the temperature-pressure-magnetic field phase diagram of CeTiGe3

“…1 (a). At ambient pressure, the resistivity exhibits typical Kondo-lattice behavior with a broad minimum ∼ 190 K followed by a maximum at T max = 31 K. The T max is assumed to be related to the Kondo interaction with a changing population of crystal electric field levels [26,[39][40][41]. The FM transition manifests itself in the resistivity data as a sharp drop at T C = 14.2 K. Similar values of T C have been reported from polycrystalline and single crystalline samples [26][27][28].…”

Tuning the Kondo effect inYb(Fe1−xCox)2Zn20

“…In a single ion Kondo picture, different local moment degeneracy can give rise to unique features in thermodynamic and transport properties 25,28,54 . In the presence of crystalline electric field, features can be observed in temperature-dependent transport measurements, exhibited as broad maxima in resistivity, for example in CeAl 2 55 , CeCu 2 Si 2 56 , CePdIn 57 , CeZn 11 58 . This was observed for several members of Yb(Fe 1−x Co x ) 2 Zn 20 series, in the middle substitution range, for example, x = 0.628 and 0.719.…”

Study of rare earth local moment magnetism and strongly correlated phenomena in various crystal structures

“…In a single ion Kondo picture, different local moment degeneracy can give rise to unique features in thermodynamic and transport properties [46; 48; 49]. In the presence of crystalline electric field, features can be observed in temperature-dependent transport measurements, exhibited as broad maxima in resistivity, for example in CeAl 2 [234], CeCu 2 Si 2 [235], CePdIn [236], CeZn 11 [237]. This was observed for several members of Yb(Fe 1−x Co x ) 2 Zn 20 series, in the middle substitution range, for example, x = 0.628 and 0.719.…”