Study of spin dynamics in NdRh2Si2 crystals byμSR relaxation measurements

Gubbens, P.C.M.; Réotier, P. Dalmas de; Yaouanc, A.; Menovsky, A.A.; Snel, C.E.

doi:10.1007/bf02069429

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…In a conventional magnet it would indicate a magnetic phase transition, see for example Ref. 40. However, as no anomaly is observed in the magnetic specific heat and susceptibility at that temperature 8,18 , the detected anomaly in λ Z does not correspond to a conventional phase transition.…”

Section: Fig 2 (Color Online)mentioning

confidence: 93%

Evidence for an exotic magnetic transition in the triangular spin system FeGa2S4

et al. 2012

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We report positive muon spin relaxation measurements on the triangular lattice magnetic system FeGa2S4. A magnetic transition not previously detected by specific heat and magnetic susceptibility measurements is found in zero field at T * ≃ 30 K. It is observed through the temperature dependencies of the signal amplitude and the spin-lattice relaxation rate. This transition is therefore not a conventional magnetic phase transition. Since persistent spin dynamics is observed down to 0.1 K, the ground state cannot be of the canonical spin-glass type, which could be suggested from hysteresis effects in the bulk susceptibility below T f ≃ 16 K. These results are compared to those found for the isomorph NiGa2S4. It is argued that the fate of the transition, which has been interpreted in terms of the Z2 topological transition in this latter system, is probably different in FeGa2S4.

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Section: Fig 2 (Color Online)mentioning

confidence: 93%

Evidence for an exotic magnetic transition in the triangular spin system FeGa2S4

et al. 2012

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“…SR is generally very sensitive to the anisotropy of the magnetic fluctuations as was nicely demonstrated for the intermetallics NdRh 2 Si 2 . 43 The second remarkable property of the measured critical spin dynamics is its extreme sensitivity to an applied magnetic field. The relaxation rate is suppressed by a magnetic field on the order of 2-5 mT.…”

Section: Spin-lattice Relaxation Ratementioning

confidence: 99%

Positive muon spin rotation and relaxation measurements on the ferromagnetic superconductorUGe2at ambient and high pressure

et al. 2010

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Results of a detailed investigation of the ferromagnetic superconductor UGe 2 using positive muon spin rotation and relaxation techniques are presented. The pressure and temperature dependences of the frequencies and related spin-spin relaxation rates show that the transition from the weakly to the strongly polarized magnetic ͑WP-SP͒ phases is still observable at T X Ӎ 3 K under a pressure of 1.33͑2͒ GPa. Thus this transition survives at higher pressures than previously believed. The temperature T X at 1.00͑2͒ GPa corresponds to a thermodynamic phase transition rather than a crossover. No such statement can be given reliably at lower pressure. A substantial shrinking of the component along the easy axis of the diagonal hyperfine tensor, at the muon site where it is large, is observed in the SP phase relative to the WP phase. This corresponds to an appreciable decrease in the electronic density at the Fermi level in the SP phase. The investigation of the paramagnetic-ferromagnetic critical spin dynamics at ambient pressure and at 0.95͑2͒ GPa shows that the simple one-band model is an oversimplification inconsistent with our critical spin-dynamics results. Data from specific heat, Fermi-surface studies, Hall effect, neutron form factor, and spectroscopic techniques supports this conclusion. Even at 0.95͑2͒ GPa the conduction electrons are characterized by a small magnetic moment, relative to the bulk magnetization per uranium atom.

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