Frequency-domain terahertz transmission spectra of Mn3 and Mn12 single molecule magnets （SMMs） have been measured at different temperatures, and hence the anisotropic parameters O2 and D4 of the spin Hamiltonian H =...Frequency-domain terahertz transmission spectra of Mn3 and Mn12 single molecule magnets （SMMs） have been measured at different temperatures, and hence the anisotropic parameters O2 and D4 of the spin Hamiltonian H = D2Sz^2 ＋ D4Sz^4 have been calculated. For Mn12 SMM, D2=-10.9 GHz and D4=-2.59×10^-2 GHz, while for Mn3 SMM, D2=-22.0 GHz and D4 can be con- sidered negligible. This suggests Mn3 SMM can be considered as a simpler and more suitable candidate for magnetic quantum tunneling research.展开更多
There is a small fraction of fast-relaxation species in Mn12-acetate, which is utilized to determine the dipolar field of Mn12. Here we report an easier way to precisely obtain the dipolar field by measuring the M-H c...There is a small fraction of fast-relaxation species in Mn12-acetate, which is utilized to determine the dipolar field of Mn12. Here we report an easier way to precisely obtain the dipolar field by measuring the M-H curves above the blocking temperature of fastrelaxation species. We found that there is a simple linear relationship between the magnetic moment and dipolar field; besides the dipolar field is also dependent on the sample shape, which is consistent with the numerical calculation.展开更多
Transmission spectroscopy of two Nb double superconducting split-ring samples with different thicknesses on MgO substrates was measured by a continuous Tera-Hertz spectrometer.The transmission curves of two different ...Transmission spectroscopy of two Nb double superconducting split-ring samples with different thicknesses on MgO substrates was measured by a continuous Tera-Hertz spectrometer.The transmission curves of two different samples with the thicknesses of 50 and 150 nm at 7.5 K show dips at 480,545 GHz,respectively,which origin from the different capacities and inductances of the samples.For the sample of 50 nm,the dip shifts to lower frequency,also decreases in depth and increases in width with temperature or field increasing below T c of Nb film,while the sample of 150 nm does not show such a phenomenon.This thickness-dependent transmission behavior is due to the kinetic inductance and conductivity change of superfluid electrons in Nb film and may suggest a practical tunable THz filter based on the thinner samples.展开更多
基金supported by the Science Foundation of the Chinese Academy of Sciences (Grant No. KJCX2-SW-W20)the National Basic Research Program of China (Grant No. 2011CB921702)
文摘Frequency-domain terahertz transmission spectra of Mn3 and Mn12 single molecule magnets （SMMs） have been measured at different temperatures, and hence the anisotropic parameters O2 and D4 of the spin Hamiltonian H = D2Sz^2 ＋ D4Sz^4 have been calculated. For Mn12 SMM, D2=-10.9 GHz and D4=-2.59×10^-2 GHz, while for Mn3 SMM, D2=-22.0 GHz and D4 can be con- sidered negligible. This suggests Mn3 SMM can be considered as a simpler and more suitable candidate for magnetic quantum tunneling research.
基金supported by the National Basic Research Program of China(Grant No. 2006CB921304)
文摘There is a small fraction of fast-relaxation species in Mn12-acetate, which is utilized to determine the dipolar field of Mn12. Here we report an easier way to precisely obtain the dipolar field by measuring the M-H curves above the blocking temperature of fastrelaxation species. We found that there is a simple linear relationship between the magnetic moment and dipolar field; besides the dipolar field is also dependent on the sample shape, which is consistent with the numerical calculation.
基金supported by the Science Foundation of the Chinese Academy of Sciences (Grant No.KJCX2-SW-W20)the National Basic Research Program of China (Grant No.2011CB921702)
文摘Transmission spectroscopy of two Nb double superconducting split-ring samples with different thicknesses on MgO substrates was measured by a continuous Tera-Hertz spectrometer.The transmission curves of two different samples with the thicknesses of 50 and 150 nm at 7.5 K show dips at 480,545 GHz,respectively,which origin from the different capacities and inductances of the samples.For the sample of 50 nm,the dip shifts to lower frequency,also decreases in depth and increases in width with temperature or field increasing below T c of Nb film,while the sample of 150 nm does not show such a phenomenon.This thickness-dependent transmission behavior is due to the kinetic inductance and conductivity change of superfluid electrons in Nb film and may suggest a practical tunable THz filter based on the thinner samples.
