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YbRh2Si2: Spin Fluctuations in the Vicinity of a Quantum Critical Point at Low Magnetic Field

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Trovarelli,  O.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel,  C.
Christoph Geibel, Physics of Quantum Materials, 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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Citation

Ishida, K., Okamoto, K., Kawasaki, Y., Kitaoka, Y., Trovarelli, O., Geibel, C., et al. (2002). YbRh2Si2: Spin Fluctuations in the Vicinity of a Quantum Critical Point at Low Magnetic Field. Physical Review Letters, 89(10): 107202, pp. 107202-107202. doi:10.1103/PhysRevLett.89.107202.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-3105-D
Abstract
We report a Si-29 NMR study on aligned single crystals of YbRh2Si2 which shows behavior characteristic of a quantum critical point (QCP: T-N-->0). The Knight shift K and the nuclear spin-lattice relaxation rate 1/T-1 of Si show a strong dependence on the external field H, especially below 5 kOe. At the lowest H used in this measurement (Hsimilar to1.5 kOe), it was found that 1/T1T continues to increase down to 50 mK, whereas K stays constant with a large magnitude below 200 mK. This result strongly suggests the development of antiferromagnetic fluctuations with finite q vectors that compete with q=0 spin fluctuations in the vicinity of the QCP near H=0.5 kOe.