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TT: Fachverband Tiefe Temperaturen

TT 59: Correlated Electrons: Quantum-Critical Phenomena - Experiments

TT 59.10: Talk

Thursday, March 14, 2013, 17:45–18:00, H6

Evolution of ferromagnetic order in Yb(Rh1−xCox)2Si2 with x ≤ 0.27 — •Sandra Hamann1, Stefan Lausberg1, Lucia Steinke1, Christoph Klingner2, Cornelius Krellner3, Manuel Brando1, Christoph Geibel1, and Frank Steglich11Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany — 2Max Planck Institute of Biochemistry, D-82152 Martinsried, Germany — 3Institute of Physics, Goethe University Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany

Antiferromagnetic (AFM) order appears in YbRh2Si2 at TN = 70 mK although strong ferromagnetic fluctuations are observed. The application of chemical pressure x in the series Yb(Rh1−xCox)2Si2 stabilizes the AFM phase, i.e. TN increases with increasing x. A second phase transition at TL < TN emerges with increasing x and the strength of the ferromagnetic fluctuations raises up to a maximum for x ≈ 0.27 [1]. Eventually, in pure YbCo2Si2 both phase transitions TN and TL are of AFM nature with 4f local moments aligned along the crystallographic ab-plane. However, the sample with x = 0.27 reveals only one phase transition at 1.30 K which is surprisingly ferromagnetic with moments parallel to the c-axis [2]. This motivates a deeper investigation of the magnetic properties in Yb(Rh1−xCox)2Si2 with the magnetic field along the c-axis. Here, we present ac-susceptibilty measurements of single crystals with x ≤ 0.27 down to a temperature of 25 mK.
[1] C. Klingner et al., Phys. Rev. B. 83, 144405 (2011)
S. Lausberg et al., arXiv:1210.1345

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