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000280626 1001_ $$0P:(DE-HGF)0$$aLoewenhaupt, M.$$b0$$eCorresponding author
000280626 245__ $$aField Dependence of the Magnetic Propagation Vector of the Heavy Fermion Compound CeCu2Ge2 Studied by Neutron Diffraction
000280626 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2015
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000280626 520__ $$aCeCu2Ge2, the counterpart of the heavy-fermion superconductor CeCu2Si2, exhibits an in-commensurate antiferromagnetically long-range ordered ground state with τ = (0.28 0.28 0.54) below TN = 4.15K. The magnetism is strongly affected by a Kondo screening of the Ce 4f-moments by conduction electrons. The similar energy scale of both, Kondo and exchange interactions, results in a complex magnetic phase diagram and gives rise to potential quantum critical phenomena at very low temperatures. We present elastic neutron diffraction data obtained on a CeCu2Ge2 single crystal employing the cold triple axis spectrometer PANDA at MLZ and the diffractometer D23 at ILL.The field dependence of the magnetic propagation vector was measured at T ≤ 400 mK in the [110]/[001] plane with vertical magnetic fields applied along [1̄10]. We observe a low-field incommensurate magnetic phase AF1, a first order phase transition around 7.8 T with the coexistence of two phases AF1 and AF2 with slightly different propagation vectors, the disappearance of AF1 at 8 T and the existence of AF2 up to 12 T with a possible modification at 10 T. At 12.6 T, yet still well below the value of 26 T of the saturation for magnetic fields in [110] direction, the AF2-type magnetic order is lost and magnetic intensities are not to be found at incommensurate positions in the [110]/[001] plane any more. These new results contradict a previously suggested scenario with a QCP located at 8 T and contribute new information to the B − T phase diagram of CeCu2Ge2 in [110] direction.
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000280626 7001_ $$0P:(DE-HGF)0$$aGeselbracht, P.$$b1
000280626 7001_ $$0P:(DE-Juel1)166243$$aFaulhaber, E.$$b2
000280626 7001_ $$0P:(DE-HGF)0$$aRotter, M.$$b3
000280626 7001_ $$0P:(DE-HGF)0$$aDoerr, M.$$b4
000280626 7001_ $$0P:(DE-Juel1)130943$$aSchmalzl, K.$$b5
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000280626 773__ $$0PERI:(DE-600)2455598-8$$a10.1016/j.phpro.2015.12.028$$gVol. 75, p. 230 - 237$$p230 - 237$$tPhysics procedia$$v75$$x1875-3892$$y2015
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