Thermal Behaviour of the μSR Relaxation Rate at High Temperature in Insulators

Réotier, P. Dalmas de; Yaouanc, A.; Gubbens, P.C.M.; Sakarya, S.; Jiménez, E.; Bonville, P.; Hodges, J.A.

doi:10.1007/s10751-005-9021-7

Cited by 6 publications

(7 citation statements)

References 9 publications

(2 reference statements)

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“…The thermal variation of λ Z over the whole temperature range is shown in the inset of figure 6: it varies little between 150 and ∼2 K, and presents a shallow local minimum slightly below 10 K. Such a feature has already been observed for other magnetically frustrated systems, e.g. Gd 2 Ti 2 O 7 , Gd 2 Sn 2 O 7 and Yb 2 Ti 2 O 7 [34]. Above 150 K and up to the maximum measurement temperature, an important drop is observed: λ Z decreases by a factor 3.…”

Section: Muon Spin Relaxation Measurementssupporting

confidence: 52%

Magnetic frustration in the disordered pyrochlore Yb₂GaSbO₇

Hodges

Réotier

Yaouanc

et al. 2011

J. Phys.: Condens. Matter

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In the pyrochlore Yb(2)GaSbO(7), the Yb(3+) sublattice forms a network of corner sharing tetrahedra and the second sublattice is made up of disordered, non-magnetic Ga(3+) and Sb(5+) ions. We have examined this compound using magnetic susceptibility, (170)Yb Mössbauer spectroscopy (down to 0.03 K) and muon spin relaxation (μSR) (down to 0.02 K) measurements. We establish the size of the Yb(3+) magnetic moments and that of the Yb(3+)-Yb(3+) coupling. At low temperatures, the correlated moments fluctuate between directions that are well tilted relative to the local [111] axis. The lattice disorder does not quench the frustration induced low temperature spin fluctuations but it does remove the first order dynamic transition that is present in the crystallographically ordered counterpart Yb(2)Ti(2)O(7). Below 1.0 K, the fluctuation rate of the correlated moments decreases progressively as the temperature is reduced and the moments remain dynamic down to 0.02 K where the rate is 7 × 10(7) s(-1). Magnetic frustration is operative in Yb(2)GaSbO(7) where the Yb(3+)-Yb(3+) interaction is antiferromagnetic as it is in Yb(2)Ti(2)O(7) where the interaction is ferromagnetic.

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Section: Muon Spin Relaxation Measurementssupporting

confidence: 52%

Magnetic frustration in the disordered pyrochlore Yb₂GaSbO₇

Hodges

Réotier

Yaouanc

et al. 2011

J. Phys.: Condens. Matter

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“…Another important result to outline is the significant increase of the relaxation rate with temperature in the paramagnetic state. This effect constitutes a clear indication of the presence of short-range magnetic correlations above the Curie temperature [31,32].…”

Section: µSr Resultsmentioning

confidence: 85%

A combined study of the magnetic properties of GdCrO₄

Jimenez-Melero

Gubbens

Steenvoorden

et al. 2006

J. Phys.: Condens. Matter

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We have performed a detailed study of the magnetic properties of GdCrO 4 at low temperatures by complementary use of different macroscopic and microscopic physical techniques. A ferromagnetic order is established in this oxide below T C = 22 K. The ordered magnetic moments of the Cr 5+ ions are located along the crystallographic c-axis, forming an angle of ≈24• with the ordered moments of the Gd 3+ ions. Surprisingly, only 20% of the Gd 3+ sublattice orders at the Curie temperature of 22 K, while the remaining 80% stays paramagnetic down to around 10 K. This 80% of the Gd 3+ ions may be ascribed to a lowtemperature orthorhombic phase. Moreover, the Gd 3+ magnetic order seems to be triggered by a relatively large transferred hyperfine field coming from the Cr 5+ sublattice.

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“…6. Similarly, an Orbach process explains the spin dynamics of the geometrically frustrated garnet Yb 3 Ga 5 O 12 above 100 K [38] and also for Yb 2 Ti 2 O 7 [39] and Nd 2 Zr 2 O 7 [25]. The scheme of the CEF levels of Nd 3+ ions in Nd 2 Sn 2 O 7 cannot explain our experimental findings at low temperature since the first excited CEF doublet is located at 26 meV above the ground state [37].…”

Section: Fig 6 (Color Online)mentioning

confidence: 88%

“…[24]. The full line displays λZ(T ) for an Orbach relaxation mechanism: λ −1 Z (T ) = AO + BO exp(−∆CEF/kBT ) [39]. The fit to the data gives A −1 O = 0.28 (1) µs −1 and BO = 118 (6) µs, with ∆CEF = 39.8 meV.…”

Section: Discussionmentioning

confidence: 99%

Slow spin tunneling in the paramagnetic phase of the pyrochlore Nd2Sn2O7

et al. 2017

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The insulating pyrochlore compound Nd2Sn2O7 has been shown to undergo a second order magnetic phase transition at Tc ≈ 0.91 K to a noncoplanar all-in-all-out magnetic structure of the Nd 3+ magnetic moments. An anomalously slow paramagnetic spin dynamics has been evidenced from neutron backscattering and muon spin relaxation (µSR). In the case of µSR this has been revealed through the strong effect of a 50 mT longitudinal field on the spin-lattice relaxation rate. Here, motivated by a recent successful work performed for Yb2Ti2O7 and Yb2Sn2O7, analyzing the shape of the µSR longitudinal polarization function, we substantiate the existence of extremely slow paramagnetic spin dynamics in the microsecond time range for Nd2Sn2O7. Between 1.7 and 7 K, this time scale is temperature independent. This suggests a double spin-flip tunneling relaxation mechanism to be at play, probably involving spin substructures such as tetrahedra. Unexpectedly, the standard deviation of the field distribution at the muon site increases as the system is cooled. This exotic spin dynamics is in sharp contrast with the dynamics above 100 K which is driven by the Orbach relaxation mechanism involving single Nd 3+ magnetic moments.

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Thermal Behaviour of the μSR Relaxation Rate at High Temperature in Insulators

Abstract: Abstract. We show that, in rare earth based insulators, measurement of the thermal dependence of the muon spin-lattice relaxation rate at high temperature provides information on the nature of the magnetic correlations and on the crystal-field energy splitting, if any.

Cited by 6 publications

References 9 publications

Magnetic frustration in the disordered pyrochlore Yb₂GaSbO₇

Magnetic frustration in the disordered pyrochlore Yb₂GaSbO₇

A combined study of the magnetic properties of GdCrO₄

Slow spin tunneling in the paramagnetic phase of the pyrochlore Nd2Sn2O7

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Thermal Behaviour of the μSR Relaxation Rate at High Temperature in Insulators

Abstract: Abstract. We show that, in rare earth based insulators, measurement of the thermal dependence of the muon spin-lattice relaxation rate at high temperature provides information on the nature of the magnetic correlations and on the crystal-field energy splitting, if any.

Cited by 6 publications

References 9 publications

Magnetic frustration in the disordered pyrochlore Yb2GaSbO7

Magnetic frustration in the disordered pyrochlore Yb2GaSbO7

A combined study of the magnetic properties of GdCrO4

Slow spin tunneling in the paramagnetic phase of the pyrochlore Nd2Sn2O7

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Product

Resources

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Magnetic frustration in the disordered pyrochlore Yb₂GaSbO₇

Magnetic frustration in the disordered pyrochlore Yb₂GaSbO₇

A combined study of the magnetic properties of GdCrO₄