scholarly journals Clock Transition Due to a Record 1240 G Hyperfine Interaction in a Lu(II) Molecular Spin Qubit

2021 ◽  
Author(s):  
Krishnendu Kundu ◽  
Jessica R. K. White ◽  
Samuel A. Moehring ◽  
Jason M. Yu ◽  
Joseph W. Ziller ◽  
...  
Keyword(s):  
Hyperfine Interaction ◽  
Self Assembly ◽  
Scale Up ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Clock Transition ◽  
Spin Lattice ◽  
Memory Time ◽  
Order Of Magnitude ◽  
Orbital Character

Spins in molecules are particularly attractive targets for next-generation quantum technologies, enabling chemically programmable qubits and potential for scale-up via self-assembly. Here, we demonstrate chemical control of the degree of s-orbital mixing into the spin-bearing d-orbital associated with a series of spin-½ La(II) and Lu(II) molecules. Increased s-orbital character reduces spin-orbit coupling and enhances the electron-nuclear Fermi contact interaction. Both outcomes are beneficial for quantum applications: the former reduces spin-lattice relaxation, while the latter gives rise to a record molecular hyperfine interaction for Lu(II) that, in turn, generates a massive 9 GHz hyperfine clock transition and an order of magnitude increase in phase memory time. These findings suggest new strategies for development of molecular quantum technologies, akin to trapped ion systems.

scholarly journals Clock Transition Due to a Record 1240 G Hyperfine Interaction in a Lu(II) Molecular Spin Qubit

2021 ◽  
Author(s):  
Krishnendu Kundu ◽  
Jessica R. K. White ◽  
Samuel A. Moehring ◽  
Jason M. Yu ◽  
Joseph W. Ziller ◽  
...  
Keyword(s):  
Hyperfine Interaction ◽  
Self Assembly ◽  
Scale Up ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Clock Transition ◽  
Spin Lattice ◽  
Memory Time ◽  
Order Of Magnitude ◽  
Orbital Character

Spins in molecules are particularly attractive targets for next-generation quantum technologies, enabling chemically programmable qubits and potential for scale-up via self-assembly. Here, we demonstrate chemical control of the degree of s-orbital mixing into the spin-bearing d-orbital associated with a series of spin-½ La(II) and Lu(II) molecules. Increased s-orbital character reduces spin-orbit coupling and enhances the electron-nuclear Fermi contact interaction. Both outcomes are beneficial for quantum applications: the former reduces spin-lattice relaxation, while the latter gives rise to a record molecular hyperfine interaction for Lu(II) that, in turn, generates a massive 9 GHz hyperfine clock transition and an order of magnitude increase in phase memory time. These findings suggest new strategies for development of molecular quantum technologies, akin to trapped ion systems.

SEMICLASSICAL THEORY OF PHONON RADIATION PROCESSES

1966 ◽  
Vol 44 (8) ◽  
pp. 1699-1714 ◽  
Author(s):  
J. Van Kranendonk
Keyword(s):  
Time Derivative ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Multipole Moments ◽  
Spin Variable ◽  
Effective Spin ◽  
Spin Lattice ◽  
Radiation Theory ◽  
Order Of Magnitude ◽  
Radiation Processes

For the various forms of the spin-lattice coupling in paramagnetic salts of the iron group ions, derived in a previous paper, a semiclassical phonon radiation theory is developed. The phonon fields are analyzed in terms of phonon multipole fields, and the phonon multipole moments are expressed in terms of the effective spin variable. The phonon multipole fields are all monopole fields in the sense that the corresponding static fields fall off at large distances as R−2, but they are monopole, dipole, and quadrupole fields as far as the angular dependence is concerned. As a result, the rates of emission by the different phonon multipoles are all of the same order of magnitude. The equation of motion of a dressed spin is derived, and the phonon radiation damping is shown to depend on the third time derivative of the phonon multipole moments. As an application, the classical theory of the resulting spin-lattice relaxation is discussed briefly.

Order fluctuations in p-methoxybenzylidene p-n-butylaniline (MBBA): A proton NMR study

1976 ◽  
Vol 54 (15) ◽  
pp. 1600-1605 ◽  
Author(s):  
Ronald Y. Dong ◽  
E. Tomchuk ◽  
J. J. Visintainer ◽  
E. Bock
Keyword(s):  
Nematic Phase ◽  
Frequency Dispersion ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Hydrodynamic Modes ◽  
Spin Lattice ◽  
Nmr Study ◽  
Order Of Magnitude ◽  
To Come

Proton spin–lattice relaxation has been studied in the nematic phase of MBBA and MBBA-d8 samples. The proton T1 temperature dependence appears to come from the motions of side chains as in p-azoxyanisole. Order of magnitude calculations of T1 based on order fluctuations agree with the ring proton T1. The proton T1 frequency dispersion of MBBA at 18 °C can be explained by order fluctuations plus a frequency dependent B term without any cutoff in the hydrodynamic modes.

Characterization of Amorphous and Crystalline TiCuDx By Deuteron Magnetic Resonance

1986 ◽  
Vol 80 ◽  
Author(s):  
M. P. Volz ◽  
V. P. Bork ◽  
P. A. Fedders ◽  
R. E. Norberg ◽  
R. C. Bowman ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Amorphous Material ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Conduction Electrons ◽  
Spin Lattice ◽  
Order Of Magnitude ◽  
Deuteron Spin

AbstractThe structure and dynamics of a-TiCu(D,H)1.7 and a-TiCu(D,H)1.4 have been examined by Fourier transform quadrupole echo DMR line shape and relaxation time measurements at 30.7 MHz. The quadrupole-broadened a-TiCu(D,H)x line widths narrowed appreciably above 300 K because of increased D mobility. Low temperature DMR spectra show that static quadrupolar broadening is larger for amorphous samples than for crystalline samples. Deuteron spin lattice relaxation is attributed to conduction electrons below 200 K and to quadrupolar interactions at higher temperatures where deuteron hopping becomes significant. The spin lattice relaxation times indicate that the deuteron mobility is larger by an order of magnitude in the amorphous material than in the crystalline counterparts. Results are compared with those from proton magnetic resonance in corresponding hydrides.

scholarly journals Electron spin dynamics and spin–lattice relaxation of trityl radicals in frozen solutions

2016 ◽  
Vol 18 (36) ◽  
pp. 24954-24965 ◽  
Author(s):  
Hanjiao Chen ◽  
Alexander G. Maryasov ◽  
Olga Yu. Rogozhnikova ◽  
Dmitry V. Trukhin ◽  
Victor M. Tormyshev ◽  
...  
Keyword(s):  
Electron Spin ◽  
Self Assembly ◽  
Nuclear Polarization ◽  
Spin Dynamics ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Frozen Solutions ◽  
Electron Spin Dynamics ◽  
Trityl Radical

Self-assembly of trityl radical aggregates dominates electron spin dynamics for dynamic nuclear polarization.

Anisotropy of antiferromagnetic spin fluctuations in the heavy fermion superconductors of CeMIn5 and PuMGa5 (M=Co, Rh)

2010 ◽  
Vol 1264 ◽  
Author(s):  
Hironori Sakai ◽  
Shinsaku Kambe ◽  
Yo Tokunaga ◽  
Yoshinori Haga ◽  
Seung -H. Baek ◽  
...  
Keyword(s):  
Heavy Fermion ◽  
Lattice Relaxation ◽  
Spin Fluctuations ◽  
Spin Lattice Relaxation ◽  
Relaxation Rates ◽  
Spin Lattice ◽  
Fermion Systems ◽  
Heavy Fermion Systems ◽  
Order Of Magnitude ◽  
Antiferromagnetic Spin

AbstractThe anisotropy of antiferromagnetic spin fluctuations has been investigated microscopically in the heavy fermion systems of CeMIn5 and PuMGa5 (M=Co, Rh) by means of nuclear magnetic resonance (NMR). Both systems are known to be relatively high-Tc superconductors among the heavy fermion systems, especially PuCoGa5, which has a Tc=18.5 K almost one order of magnitude larger than for CeCoIn5 ( Tc=2.3 K). Analysis of the Knight shift and spin-lattice relaxation rates suggests XY-type anisotropy in the antiferromagnetic spin fluctuations in the normal states of these unconventional superconductors. Moreover, the 115 superconductors with larger XY-type fluctuations have a higher Tc, compared to the anisotropy of spin fluctuations in the related paramagnetic system UFeGa5 and antiferromagnets UPtGa5, NpCoGa5, NpFeGa5.

Surface and Volume Diffusion of Water and Oil in Porous Media by Field Cycling Nuclear Relaxation and Pgse NMR

2000 ◽  
Vol 651 ◽  
Author(s):  
S. Godefroy ◽  
J.-P. Korb ◽  
D. Petit ◽  
M. Fleury ◽  
R. G. Bryant
Keyword(s):  
Magnetic Field ◽  
Surface Diffusion ◽  
Diffusion Coefficients ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Relaxation Rates ◽  
Spin Lattice ◽  
Order Of Magnitude ◽  
Dynamical Parameters ◽  
Field Cycling

AbstractThe microdynamics of water and oil in macroporous media with SiO2 or CaCO3 surfaces has been probed at various temperatures by magnetic field-cycling measurements of the spin-lattice relaxation rates. These measurements and an original theory of surface diffusion allowed us to obtain surface dynamical parameters, such as a coefficient of surface affinity of the liquid molecules and the surface diffusion coefficient. The water surface diffusion coefficients are compared to the volume self-diffusion coefficients of water in pores, measured by PGSE method, the latter values being more than an order of magnitude higher than the surface ones. Complementary information on the nature of the solid-liquid interface was given by NMR chemical shift experiments at high magnetic field.

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