We have observed the double-spin-flip mode, corresponding to one photon flipping two nuclear spins, in rhodium with low-frequency SQUID NMR at ultralow temperatures. The shift and magnitude of the absorption line at around twice the Larmor frequency has been studied. The shift of the double-spin-flip mode can be used to calculate the relative strength of the Ruderman-Kittel exchange interaction, for which we obtain R = - 0.9 +/- 0.1. (C) 2000 Elsevier Science B.V. All rights reserved.
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Univ Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
Chinese Acad Sci, Graduate Univ, Beijing 100049, Peoples R ChinaUniv Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
Wen Pei-Wei
Cao Li-Gang
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Univ Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
Natl Lab Heavy Ion Accelerator Lanzhou, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R ChinaUniv Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China