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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 54: Correlated Electrons: Heavy Fermions

TT 54.4: Talk

Wednesday, April 2, 2014, 10:15–10:30, HSZ 204

Magnetic phases in the heavy-fermion system Yb(Rh1−xCox)2Si2 — •A. Hannaske1, O. Stockert1, C. Klingner1, N. Mufti1, C. Krellner2, A. Hoser3, J.-U. Hoffmann3, S. Matas3, S. Capelli4, M.-H. Lemee-Cailleau4, K. Kaneko5, M. Brando1, C. Geibel1, and F. Steglich11Max-Planck-Institut CPfS, Dresden, Germany — 2Goethe-Universität Frankfurt, Frankfurt a. M., Germany — 3Helmholtz-Zentrum Berlin, Berlin, Germany — 4Institut Laue-Langevin, Grenoble, France — 5Japan Atomic Energy Agency, Tokai, Japan

One route to get insight into the unusual magnetic properties of quantum critical YbRh2Si2 is to study magnetism in the alloying series Yb(Rh1−xCox)2Si2. Isoelectronic doping of Co on the Rh site leads to a stabilization of the magnetic order. The magnetic phases in Yb(Rh1−xCox)2Si2 have been investigated in detail by thermodynamic measurements and neutron scattering. In pure YbCo2Si2 the occurrence of antiferromagnetic domains plays an important role in understanding the magnetic BT phase diagram. While for Yb(Rh1−xCox)2Si2 with high Co content our measurements clearly reveal an incommensurate magnetically ordered phase below TN followed by a commensurate phase at low T, the magnetic order drastically changes below about x ≈ 0.58 where surprisingly ferromagnetic behavior was observed. We will discuss this finding and its impact on the quantum criticality in YbRh2Si2.

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