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Abstract: A recent study of CeTiGe identified this compound as a paramagnetic heavy Fermion system where the full J = 5/2 multiplet is involved in the formation of the ground state. Here we present a preliminary investigation of the dc-magnetization M_dc(H) and of the magnetoresistance Ï(H) of polycrystalline CeTiGe samples in applied magnetic fields up to Î¼₀H = 14 T. The results reveal a pronounced metamagnetic transition at a critical field Î¼₀H_c â‰ˆ 13.5 T at low temperatures, with a step like increase in M_dc(H) of at least 0.6 Î¼_B/Ce. The metamagnetic transition leads to a strong decrease in Ï(H). A clear hysteresis in M_dc(H) and Ï(H) indicate that in CeTiGe these metamagnetic features correspond to a true thermodynamic, first order type transition in contrast to the critical behavior observed in the canonical system CeRu₂Si₂. Measurements at higher temperatures showed a continuous suppression of the metamagnetic transition with increasing T, which vanishes at T âˆ¼ 30 K. Â© 2010 IOP Publishing Ltd.

Keywords: Applied magnetic fields; Canonical systems; Continuous suppression; Critical behavior; Critical fields; DC magnetization; First order; Heavy fermion systems; Higher temperatures; Low temperatures; Metamagnetic; Metamagnetic transitions; Polycrystalline; Cerium; Cerium compounds; Electric resistance; Magnetic field effects; Magnetoresistance; Magnetism

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Abstract: A recent investigation of the low temperature properties of the paramagnetic heavy fermion system CeRuSi revealed an anomalous decrease of the coefficient C/T below 6 K, indicating a second low energy scale well below the Kondo temperature of about 50 K. We started an investigation of this unusual behavior using the local probe ²⁹Si-NMR. Here a preliminary ²⁹Si field sweep NMR study in the temperature 4.2-200 K is reported. ²⁹Si-NMR powder spectra obtained at 72.9 MHz could be simulated and shift components ²⁹K_ab(T) and ²⁹K _c(T) were determined. The shift along the basal plane ²⁹K_ab(T) shows the expected behavior with a Curie-Weiss dependence at high T merging in a constant value below 15 K. In contrast the shift along the tetragonal axis reveals an anomalous T dependence below 15 K where ²⁹K_c(T) drops by a factor of 2, confirming the presence of a further low T energy scale. We suspect this drop to be related to the anomalous decrease of C/T below 6 K and discuss possible mechanism. Â© 2010 IOP Publishing Ltd.

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	Deppe, M., N. Caroca-Canales, J. G. Sereni, and C. Geibel. "Evidence for a metamagnetic transition in the heavy Fermion system CeTiGe." In Journal of Physics: Conference Series, 012026. Vol. 200. International Conference on Magnetism, ICM 2009 200, no. SECTION 1. Karlsruhe, 2010. Abstract: A recent study of CeTiGe identified this compound as a paramagnetic heavy Fermion system where the full J = 5/2 multiplet is involved in the formation of the ground state. Here we present a preliminary investigation of the dc-magnetization M_dc(H) and of the magnetoresistance Ï(H) of polycrystalline CeTiGe samples in applied magnetic fields up to Î¼₀H = 14 T. The results reveal a pronounced metamagnetic transition at a critical field Î¼₀H_c â‰ˆ 13.5 T at low temperatures, with a step like increase in M_dc(H) of at least 0.6 Î¼_B/Ce. The metamagnetic transition leads to a strong decrease in Ï(H). A clear hysteresis in M_dc(H) and Ï(H) indicate that in CeTiGe these metamagnetic features correspond to a true thermodynamic, first order type transition in contrast to the critical behavior observed in the canonical system CeRu₂Si₂. Measurements at higher temperatures showed a continuous suppression of the metamagnetic transition with increasing T, which vanishes at T âˆ¼ 30 K. Â© 2010 IOP Publishing Ltd. Keywords: Applied magnetic fields; Canonical systems; Continuous suppression; Critical behavior; Critical fields; DC magnetization; First order; Heavy fermion systems; Higher temperatures; Low temperatures; Metamagnetic; Metamagnetic transitions; Polycrystalline; Cerium; Cerium compounds; Electric resistance; Magnetic field effects; Magnetoresistance; Magnetism Permanent link \| Save citation: RTF PDF LaTeX \| Export record: BibTeX Endnote ISI RIS Atom XML MODS XML ODF XML Word XML
	Sarkar, R., M. Baenitz, J. G. Sereni, and C. Geibel. "²⁹Si NMR study of the heavy fermion system CeRuSi." Journal of Physics: Conference Series 200 (2010): 012173. Abstract: A recent investigation of the low temperature properties of the paramagnetic heavy fermion system CeRuSi revealed an anomalous decrease of the coefficient C/T below 6 K, indicating a second low energy scale well below the Kondo temperature of about 50 K. We started an investigation of this unusual behavior using the local probe ²⁹Si-NMR. Here a preliminary ²⁹Si field sweep NMR study in the temperature 4.2-200 K is reported. ²⁹Si-NMR powder spectra obtained at 72.9 MHz could be simulated and shift components ²⁹K_ab(T) and ²⁹K _c(T) were determined. The shift along the basal plane ²⁹K_ab(T) shows the expected behavior with a Curie-Weiss dependence at high T merging in a constant value below 15 K. In contrast the shift along the tetragonal axis reveals an anomalous T dependence below 15 K where ²⁹K_c(T) drops by a factor of 2, confirming the presence of a further low T energy scale. We suspect this drop to be related to the anomalous decrease of C/T below 6 K and discuss possible mechanism. Â© 2010 IOP Publishing Ltd. Keywords: Basal planes; Energy scale; Heavy fermion systems; High-T; Kondo temperatures; Local probes; Low energies; NMR studies; Powder spectra; Drops; Silicon Permanent link \| Save citation: RTF PDF LaTeX \| Export record: BibTeX Endnote ISI RIS Atom XML MODS XML ODF XML Word XML