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Gottlieb, Albert M.; Heller, Peter

doi:10.1103/physrevb.3.3615

“…The exponent of w = 0.45 suggests that LiCrO 2 in the critical region is described by a three dimensional interaction model. [11], FeF 2 [12]), triangular-lattice (Li 7 RuO 6 [7], NiGa 2 S 4 [13]) and the present LiCrO 2 .…”

Section: Resultsmentioning

confidence: 61%

7Li NMR Studies of LiCrO2

Itoh

2013

Preprint

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We report on 7 Li NMR studies of a spin S = 3/2 triangular lattice antiferromagnet LiCrO 2 (Néel temperature T N = 62 K) in the paramagnetic state by using the free-induction decay of 7 Li nuclear magnetization. We observed critical divergence of the 7 Li nuclear spin-lattice relaxation rate 1/T 1 near T N , a narrow critical region, and a critical exponent w = 0.45 from a fit of 1/T 1 ∝ (T /T N -1) −w . Although spin frustration effects have been explored for this system, the dynamical critical phenomena suggest that LiCrO 2 in the critical region is a poor low dimensional antiferromagnetic system.

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“…[7], NiGa 2 S 4 [13]) and the present LiCrO 2 . Figure 3 shows log-log plots of the normalized (1/T 1 )/(1/T 1∞ ) against the reduced temperature (T − T N )/T N for three dimensional antiferromagnets (CuO [11], FeF 2 [12]), triangular-lattice antiferromagnets (Li 7 RuO 6 [7], NiGa 2 S 4 [13]) and the present LiCrO 2 . The critical divergence of (1/T 1 )/(1/T 1∞ ) of LiCrO 2 coincides with a part of FeF 2 , which is a uniaxial anisotropic Heisenberg system.…”

Section: Resultsmentioning

confidence: 99%

⁷Li NMR Studies of LiCrO₂

Itoh¹

2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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We report on 7 Li NMR studies of a spin S = 3/2 triangular lattice antiferromagnet LiCrO 2 (Néel temperature T N = 62 K) in the paramagnetic state by using the free-induction decay of 7 Li nuclear magnetization. We observed critical divergence of the 7 Li nuclear spin-lattice relaxation rate 1/T 1 near T N , a narrow critical region, and a critical exponent w = 0.45 from a fit of 1/T 1 ∝ (T /T N -1) −w . Although spin frustration effects have been explored for this system, the dynamical critical phenomena suggest that LiCrO 2 in the critical region is a poor low dimensional antiferromagnetic system.

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“…At present there are experimental data on the critical NMR anomalies in antiferromagnets [7,9,13 to 151. For the most known ferrodielectrics = 3 to 4 [lS].…”

Section: From (25) To (28) We Getmentioning

confidence: 97%

“…The NMR study of the critical dynamics of magnets has some advantages as compared with neutronography since in HL (6), as is known [7], the resolution of the neutron spectrometers is seemingly small.…”

Section: The Critical Anomalies Of the Nmr Linementioning

confidence: 99%