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Article Dans Une Revue Physical Review Letters Année : 2010

Ground State of the Easy-Axis Rare-Earth Kagome Langasite Pr3Ga5SiO14

Résumé

We report muon spin relaxation and Ga-69,Ga-71 nuclear quadrupolar resonance local-probe investigations of the kagome compound Pr3Ga5SiO14. Small quasistatic random internal fields develop below 40 K and persist down to our base temperature of 21 mK. They originate from hyperfine-enhanced Pr-141 nuclear magnetism which requires a nonmagnetic Pr3+ crystal-field (CF) ground state. In addition, we observe a broad maximum of the relaxation rate at similar or equal to 10 K which we attribute to the population of the first excited magnetic CF level. Our results yield a Van Vleck paramagnet picture, at variance with the formerly proposed spin-liquid ground state.

Dates et versions

hal-00976054 , version 1 (09-04-2014)

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Andrej Zorko, Fabrice Bert, Philippe Mendels, Karol Marty, Pierre Bordet. Ground State of the Easy-Axis Rare-Earth Kagome Langasite Pr3Ga5SiO14. Physical Review Letters, 2010, 104 (5), pp.057202. ⟨10.1103/PhysRevLett.104.057202⟩. ⟨hal-00976054⟩
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