Observation of Spin Freezing in CaV4O9 and CaV2O5 by uSR
G.M.Luke, Y.Fudamoto, K.M.Kojima, M.Larkin, J.Merrin, B.Nachumi,, S.Sinawi, Y.J.Uemura, M.J.P.Gingras, M.Sato, S.Taniguchi, M.Isobe, Y.Ueda
TL;DR
This study uses muon spin relaxation and susceptibility measurements to detect spin freezing in CaV4O9 and CaV2O5, revealing that a significant portion of vanadium magnetic moments remain unpaired at low temperatures.
Contribution
It provides new experimental evidence of spin freezing and magnetic moment behavior in CaV4O9 and CaV2O5 using muon spin relaxation techniques.
Findings
Spin freezing observed below 12K in CaV4O9
Spin freezing observed below 50K in CaV2O5
Presence of unpaired vanadium magnetic moments at low temperatures
Abstract
We have performed muon spin relaxation and susceptibility measurements of CaV_4O_9 and CaV_2O_5, systems in which spin gap-like behavior has been found. We observe spin freezing in the two compounds below 12K and 50K, respectively. Our results indicate the possibility that a substantial fraction of the of the vanadium magnetic moment is not in a spin singlet sate at low temperatures in either material.
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Taxonomy
TopicsAdvanced Condensed Matter Physics · Physics of Superconductivity and Magnetism · Inorganic Fluorides and Related Compounds