Formation of the S  =  1 paramagnetic centers in the bond-diluted spin-gap magnet.
Electron spin resonance experiment reveals that non-magnetic bond doping of the spin-gap magnet (C4H12N2)Cu2Cl6 (abbreviated PHCC) results in the formation of S  =  1 paramagnetic centers that dominate low-temperature ESR response. We have followed evolution of this signal with doping impurity content and have found that the concentraion of these centers is quadratic over the impurity content. We also observe coexistence of the ESR responses from these local centers and from delocalized triplet excitations over a certain temperature range.
P.L.Kapitza Institute for Physical Problems RAS, Kosygin str. 2, 119334 Moscow, Russia. Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia.
V N
VN
Glazkov
Yu V
YV
Krasnikova
D
D
Hüvonen
A
A
Zheludev