scholarly journals Two-Pulse Phase Modulation Based Decoupling Schemes for Removing Heteronuclear Spin Interactions in the NMR Spectroscopy of Isotropic Systems: An Analysis Using Experiments and Numerical Simulations

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Cyril Augustine
Keyword(s):  
Nmr Spectroscopy ◽  
Spin System ◽  
Phase Modulation ◽  
Magnetization Vector ◽  
Spin Systems ◽  
Frequency Sweep ◽  
Spin Interactions ◽  
Nuclear Magnetization ◽  
Experimental Parameters ◽  
Isotropic Spin

Heteronuclear spin interactions in solids and anisotropic liquids can be removed by phase modulated decoupling sequences with frequency sweep, such as SWf-TPPM and its variants. The performance of these sequences in isotropic spin systems with regard to the experimental parameters, phase angle, and decoupler offset is presented here. A comparison is made with other commonly used heteronuclear decoupling schemes in liquids, namely, WALTZ-16, GARP, and MLEV. Also, the trajectories of nuclear magnetization vector of abundant nuclei in a simple spin system during TPPM and SWf-TPPM decoupling sequences are traced out using computer simulations.

Multiphoton NMR spectroscopy on a spin system withI=1/2

1983 ◽  
Vol 78 (9) ◽  
pp. 5293-5310 ◽  
Author(s):  
Y. Zur ◽  
M. H. Levitt ◽  
S. Vega
Keyword(s):  
Nmr Spectroscopy ◽  
Spin System

scholarly journals Contraction: A Unified Perspective of Correlation Decay and Zero-Freeness of 2-Spin Systems

2021 ◽  
Vol 185 (2) ◽  
Author(s):  
Shuai Shao ◽  
Yuxin Sun
Keyword(s):  
Partition Function ◽  
Approximation Algorithms ◽  
External Field ◽  
Spin System ◽  
Spin Systems ◽  
Interaction Parameters ◽  
Entire Family ◽  
Bounded Degree ◽  
Correlation Decay ◽  
Complex Valued

AbstractWe study the connection between the correlation decay property (more precisely, strong spatial mixing) and the zero-freeness of the partition function of 2-spin systems on graphs of bounded degree. We show that for 2-spin systems on an entire family of graphs of a given bounded degree, the contraction property that ensures correlation decay exists for certain real parameters implies the zero-freeness of the partition function and the existence of correlation decay for some corresponding complex neighborhoods. Based on this connection, we are able to extend any real parameter of which the 2-spin system on graphs of bounded degree exhibits correlation decay to its complex neighborhood where the partition function is zero-free and correlation decay still exists. We give new zero-free regions in which the edge interaction parameters and the uniform external field are all complex-valued, and we show the existence of correlation decay for such complex regions. As a consequence, we obtain approximation algorithms for computing the partition function of 2-spin systems on graphs of bounded degree for these complex parameter settings.

PULSE-FIELD EXPERIMENTS ON THE SPIN-LATTICE INTERACTION IN LOW-DIMENSIONAL SPIN SYSTEMS

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3369-3372
Author(s):  
B. WOLF ◽  
S. ZHERLITSYN ◽  
S. SCHMIDT ◽  
B. LÜTHI ◽  
M. LANG
Keyword(s):  
Magnetic Field ◽  
Spin System ◽  
Field Experiments ◽  
Resonant Interaction ◽  
Quantum Spin ◽  
Spin Systems ◽  
Pulse Field ◽  
Quantum Spin System ◽  
Magnetic Excitations ◽  
Low Dimensional

Low-dimensional spin systems reveal new and unexpected physical phenomena such as distinct plateaus in the magnetization as a function of magnetic field. In this paper we present ultrasonic measurements for the quasi-two-dimensional spin system SrCu2(BO3)2 in magnetic fields up to 50 T. From this technique we obtained detailed information about the spin state, the magnetic excitations and their interaction with phonons. The dimerized quantum-spin system SrCu2(BO3)2 exhibits plateaus in the magnetization and shows surprisingly strong magneto-elastic effects as a function of temperature and magnetic field. The pronounced elastic anomalies indicate a resonant interaction between the sound wave and the magnetic excitations.

Critical Exponents in Isotropic Spin Systems

1972 ◽  
Vol 6 (5) ◽  
pp. 1891-1893 ◽  
Author(s):  
Franz J. Wegner
Keyword(s):  
Critical Exponents ◽  
Spin Systems ◽  
Isotropic Spin

Magnetic properties and spin structure on Ising spin system with two-spin and four-spin interactions

2007 ◽  
Vol 310 (2) ◽  
pp. e435-e437 ◽  
Author(s):  
T. Iwashita ◽  
K. Uragami ◽  
A. Shimizu ◽  
A. Nagaki ◽  
T. Kasama ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spin System ◽  
Spin Structure ◽  
Ising Spin ◽  
Spin Interactions ◽  
Ising Spin System
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