Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 39: Correlated Electrons: Heavy Fermions 1
TT 39.4: Vortrag
Donnerstag, 26. März 2009, 10:30–10:45, HSZ 304
Concentration tuning of magnetic order in CePd1−xNixAl compounds — •Nadezda Bagrets1, Veronika Fritsch1, Gernot Goll1, and Hilbert v. Löhneysen1,2 — 1Physikalisches Institut, Universität Karlsruhe, 76128 Karlsruhe, Germany — 2Institut für Festkörperphysik, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany
The intermetallic alloys CePd1−xNixAl are examples of antiferromagnetic (AF) heavy-fermion compounds which can be tuned to quantum critical point (QCP). CePdAl is well known as geometrically frustrated Kagomé-like lattice [1]. The substitution of Pd with Ni in CePdAl induces chemical pressure. The transition temperature decreases with increasing Ni content [2]. We performed specific-heat measurements on CePd1−xNixAl compounds down to 30 mK. The AF transition is still visible for x=0.1. From the TN vs. x dependence we expect the QCP at about x=0.12−0.13. Surprisingly, our measurements show that the magnetic moment per formula unit at low temperature increases with increasing Ni content (chemical pressure) in contrast to a hydrostatic pressure [3]. We will present the specific heat and susceptibility measurements at very low temperatures as well as magnetization measurements up to a room temperature.
[1] H. Kitazawa, et al., Physica B 199/200, 28 (1994).
[2] Y. Isikawa, et al., Physica B 281/282, 365 (2000).
[3] S. Hane, et al., Physica B 281/282, 391 (2000).