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Towards ferromagnetic quantum criticality in FeGa3-xGex: 71Ga NQR as a zero-field microscopic probe

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Majumder,  M.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Wagner,  M.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Cardoso-Gil,  R.
Raul Cardoso, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Grin,  Y.
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Baenitz,  M.
Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Majumder, M., Wagner, M., Cardoso-Gil, R., Gille, P., Steglich, F., Grin, Y., et al. (2016). Towards ferromagnetic quantum criticality in FeGa3-xGex: 71Ga NQR as a zero-field microscopic probe. Physical Review B, 93(6): 064410, pp. 1-5. doi:10.1103/PhysRevB.93.064410.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-C6CA-0
Abstract
Ga-71 NQR, magnetization, and specific-heat measurements have been performed on polycrystalline Ge-doped FeGa3 samples. A crossover from an insulator to a correlated local moment metal in the low-doping regime and the evolution of itinerant ferromagnet upon further doping is found. For the nearly critical concentration at the threshold of ferromagnetic order, x(C) = 0.15, (71)(1/T1T) exhibits a pronounced T-4/3 power law over two orders of magnitude in temperature, which indicates three-dimensional quantum critical ferromagnetic fluctuations. Furthermore, for the ordered x = 0.2 sample (T-C approximate to 6K), (71)(1/T1T) could be fitted well in the frame of Moriya's self-consistent renormalization theory for weakly ferromagnetic systems with 1/T1T similar to chi. In contrast to this, the low-doping regime nicely displays local moment behavior where 1/T1T similar to chi(2) is valid. For T -> 0, the Sommerfeld ratio gamma = (C/T) is enhanced (70 mJ/mole K-2 for x = 0.1), which indicates the formation of heavy 3d electrons.