A5085332518- Rare-earth and actinide compounds
- Physics of Superconductivity and Magnetism
- Iron-based superconductors research
- Quantum optics and atomic interactions
- Advanced Condensed Matter Physics
- Magnetic Properties of Alloys
- NMR spectroscopy and applications
- Magnetic and transport properties of perovskites and related materials
- Quantum and electron transport phenomena
- Elasticity and Material Modeling
- Luminescence Properties of Advanced Materials
- High-pressure geophysics and materials
- Material Dynamics and Properties
- Atomic and Subatomic Physics Research
University of California, Davis
2021-2024
Using spin-echo nuclear magnetic resonance in the model transverse field Ising system ${\mathrm{TmVO}}_{4}$, we show that low frequency quantum fluctuations at critical point have a very different effect on $^{51}\mathrm{V}$ spins than classical low-frequency noise or arise finite temperature point. Spin echoes filter out but not fluctuations. This allows us to directly visualize fan and demonstrate persistence of coupling strength ${\mathrm{TmVO}}_{4}$ high temperatures an experiment...
We present nuclear magnetic (NMR) and quadrupole (NQR) resonance magnetization data in the normal state of topological crystalline superconductor ${\mathrm{LaNiGa}}_{2}$. find no evidence significant fluctuations or enhanced paramagnetism. These results suggest that time-reversal symmetry breaking previously reported superconducting this material is not driven by strong electron correlations.
We investigate the effectiveness of Inverse Laplace Transform (ILT) analysis method to extract distribution relaxation rates from nuclear magnetic resonance data with stretched exponential relaxation. Stretched-relaxation is a hallmark rates, and an analytical expression exists for this case spin-1/2 nucleus. compare theoretical those extracted via ILT several values stretching exponent at different levels experimental noise. The accurately captures distributions $\beta \lesssim 0.7$, signal...
We present nuclear magnetic resonance (NMR), neutron diffraction, magnetization, and transport measurements on a single crystal powder of ${\mathrm{CeVGe}}_{3}$. This material exhibits heavy fermion behavior at low temperatures, accompanied by antiferromagnetic (AFM) order below 5.8 K. find that the structure is incommensurate with AFM helical structure, characterized modulated propagation vector $(0,0,0.49)$ in-plane moments rotating around $c$ axis. The NMR Knight shift spin-lattice...
We present nuclear magnetic resonance data in BaFe2As2 the presence of pulsed strain fields that are interleaved time with radio frequency excitation pulses. In this approach, preceding magnetization acquires a phase shift is proportional to and pulse time. The sensitivity approach limited by homogeneous decoherence time, T2, rather than inhomogeneous linewidth. measure nematic susceptibility as function temperature demonstrate three orders magnitude improvement sensitivity. This will enable...
The suppression of ferroquadrupolar order in TmVO$_4$ a magnetic field is well-described by the transverse Ising model, enabling detailed studies critical dynamics near quantum phase transition. We describe nuclear resonance measurements pure and Y-doped single crystals. non-Kramers nature ground state doublet leads to unique form hyperfine coupling that exclusively probes susceptibility. Our results show this quantity diverges at field, contrast mean-field prediction. Furthermore, we find...
We present nuclear magnetic (NMR) and qudrupole (NQR) resonance magnetization data in the normal state of topological crystalline superconductor LaNiGa$_2$. find no evidence fluctuations or enhanced paramagnetism. These results suggest that time-reversal symmetry breaking previously reported superconducting this material is not driven by strong electron correlations.
We present nuclear magnetic resonance (NMR), neutron diffraction, magnetization, and transport measurements on a single crystal powder of CeVGe$_3$. This material exhibits heavy fermion behavior at low temperature, accompanied by antiferromagnetic (AFM) order below 5.8 K. find that the structure is incommensurate with AFM helical structure, characterized modulated propagation vector $(0, 0, 0.49)$ in-plane moments rotating around $c$-axis. The NMR Knight shift spin-lattice relaxation rate...
Using spin-echo Nuclear Magnetic Resonance in the model Transverse-Field Ising system TmVO$_4$, we show that low frequency quantum fluctuations at critical point have a very different effect on $^{51}$V nuclear-spins than classical low-frequency noise or arise finite temperature point. Spin-echos filter out but not fluctuations. This allows us to directly visualize fan and demonstrate persistence of coupling strength TmVO$_4$ high temperatures an experiment remains transparent phase...
We present nuclear magnetic resonance data in BaFe$_2$As$_2$ the presence of pulsed strain fields that are interleaved time with radiofrequency excitation pulses. In this approach, precessing magnetization acquires a phase shift is proportional to and pulse time. The sensitivity approach limited by homogeneous decoherence time, $T_2$, rather than inhomogeneous linewidth. measure nematic susceptibility as function temperature, demonstrate three orders magnitude improvement sensitivity. This...