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Diagnosis of quantum criticality by nuclear spin‐echo decay method
Author(s) -
Kambe S.,
Sakai H.,
Tokunaga Y.,
Chudo H.,
Walstedt R. E.
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200983063
Subject(s) - physics , condensed matter physics , spin (aerodynamics) , quantum , criticality , spin echo , quantum critical point , fermion , relaxation (psychology) , exponent , critical point (mathematics) , quantum mechanics , nuclear physics , quantum phase transition , magnetic resonance imaging , mathematics , medicine , psychology , social psychology , mathematical analysis , radiology , thermodynamics , linguistics , philosophy
The Gaussian spin–spin relaxation time T 2G , as determined by nuclear magnetic resonance (NMR) spin‐echo decay measurements, is found to be useful for diagnosis of quantum critical behaviour in heavy‐fermion systems. Combining T 2G with the spin–lattice relaxation time T 1 , the exponent ϕ of the quantity $T_1 T/T_{2G}^2 \sim T^\phi$ is predicted to be sensitive to the type of quantum criticality in the system concerned. In fact, in the heavy‐fermion system USn 3 near the quantum critical point, $T_1 T/T_{2G}^2$ is found to be constant, as expected for a 3D‐SDW magnetic instability.