A5103100049- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Rare-earth and actinide compounds
- Theoretical and Computational Physics
- Organic and Molecular Conductors Research
- Superconductivity in MgB2 and Alloys
- Magnetism in coordination complexes
- Superconducting Materials and Applications
- X-ray Diffraction in Crystallography
- Iron-based superconductors research
- Crystallization and Solubility Studies
- Advanced NMR Techniques and Applications
- Plant responses to water stress
- Inorganic Fluorides and Related Compounds
- Magnetic properties of thin films
- Paleontology and Stratigraphy of Fossils
- Rice Cultivation and Yield Improvement
- Magnetic and transport properties of perovskites and related materials
- Muon and positron interactions and applications
- Inorganic Chemistry and Materials
- Crop Yield and Soil Fertility
- Plant nutrient uptake and metabolism
- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- Genetics and Plant Breeding
Anhui Academy of Agricultural Sciences
2018-2024
Guizhou University
2021-2023
Bureau of Geology and Mineral Exploration and Development of Guizhou Province
2023
Ministry of Natural Resources
2023
Tobacco Research Institute
2018
West Anhui University
2013
Anhui Agricultural University
2013
Tsinghua University
2011
Columbia University
1991-2001
Fukui University of Technology
1993-2000
Muon-spin-relaxation and bulk measurements of the magnetic-field penetration depth suggest that cuprate high-${\mathit{T}}_{\mathit{c}}$, bismuthate, organic Chevrel-phase, heavy-fermion systems possibly belong to a unique group superconductors characterized by high transition temperatures ${\mathit{T}}_{\mathit{c}}$ relative values ${\mathit{n}}_{\mathit{s}}$/${\mathit{m}}^{\mathrm{*}}$ (carrier density/effective mass). This feature distinguishes these exotic from ordinary BCS superconductors.
We report muon spin rotation-relaxation measurements of the heavy fermion superconductor ${\mathrm{UPt}}_{3}$. The broadening transverse field precession signal sets in approximately 60 mK below ${\mathit{T}}_{\mathit{c}}$, a temperature which corresponds to lower superconducting transition. In zero applied magnetic field, we observe an increase internal within state can be explained if ``lower phase'' H-T phase diagram ${\mathrm{UPt}}_{3}$ is characterized by broken time-reversal symmetry.
We have performed muon spin relaxation measurements of the frustrated kagom\'e lattice system Sr${\mathrm{Cr}}_{8}$${\mathrm{Ga}}_{4}$${\mathrm{O}}_{19}$. Our results demonstrate slowing down Cr fluctuations when cooling toward susceptibility-cusp temperature ${T}_{g}\ensuremath{\sim}3.5$ K. The saturation rate below ${T}_{g}$, together with its weak dependence on longitudinal field (LF) between 0 and 2 kG, indicates presence dynamic persisting even at $T\ensuremath{\sim}100$ mK without...
The magnetic-field penetration depth \ensuremath{\lambda} in the organic superconductors \ensuremath{\kappa}-(BEDT-TTF${)}_{2}$ Cu(NCS${)}_{2}$ and Cu[N(CN${)}_{2}$]Br has been measured over a wide temperature region 20 mK\ensuremath{\le}T\ensuremath{\le}15 K via muon-spin-relaxation technique. Linear variation of with T at low temperatures, found both systems, is consistent anisotropic superconducting pairings line nodes energy gap. In latter compound, we observe flux depinning...
The spin dynamics of geometrically frustrated pyrochlore antiferromagnets Y2Mo2O7 and Tb2Mo2O7 have been investigated using muon relaxation. A dramatic slowing down the moment fluctuations occurs as one approaches freezing temperatures (TF=22 K 25 respectively) from above. Below TF there is a disordered magnetic state similar to that found in glass but with residual relaxation rate at low temperatures. These results show large density states for excitations these systems near zero energy.
We have performed zero-field muon-spin-rotation \ensuremath{\mu}Sr measurements of the ``infinite-layer'' cuprate compound ${\mathrm{Ca}}_{0.86}$${\mathrm{Sr}}_{0.14}$${\mathrm{CuO}}_{2}$ and ``infinite chain'' system ${\mathrm{Sr}}_{2}$${\mathrm{CuO}}_{3}$. A spontaneous magnetic field from ordered Cu moments is observed below ${\mathit{T}}_{\mathit{N}}$=540\ifmmode\pm\else\textpm\fi{}5 K in ${\mathrm{Ca}}_{0.86}$${\mathrm{Sr}}_{0.14}$${\mathrm{CuO}}_{2}$: T=360 K, we observe muon-spin...
We have performed muon spin relaxation measurements of the spin-ladder cuprates ${\mathrm{Sr}}_{n\ensuremath{-}1}{\mathrm{Cu}}_{n+1}{\mathrm{O}}_{2n}$ ( $n\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3,5$). The 3-leg ladder system $n\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}5$) shows static magnetic order at $T\ensuremath{\sim}52\mathrm{K}$, which is between ordering temperatures one-dimensional chain ${\mathrm{Sr}}_{2}\mathrm{Cu}{\mathrm{O}}_{3}$...
Muon-spin-rotation and relaxation (\ensuremath{\mu}SR) studies of the organic compounds (TMTSF${)}_{2}$-X (X=${\mathrm{PF}}_{6}$, ${\mathrm{NO}}_{3}$, ${\mathrm{ClO}}_{4}$) at ambient pressure are reported. We observe spin-density-wave (SDW) states in all three under zero external magnetic field. The onset SDW is extremely sharp, which may indicate a first-order transition. sublattice magnetization (or amplitude) ${\mathrm{PF}}_{6}$ compound exhibits significant reduction with increasing...
We have examined the magnetic properties of frustrated kagom\'e lattice spin systems ${\mathrm{KFe}}_{3}$(OH${)}_{6}$(${\mathrm{SO}}_{4}$${)}_{2}$ (Fe-jarosite) and ${\mathrm{KCr}}_{3}$(OH${)}_{6}$(${\mathrm{SO}}_{4}$${)}_{2}$ (Cr-jarosite) using \ensuremath{\mu}SR technique. In Fe-jarosite, a clear muon precession signal in zero field was found below 55 K, corresponding to long-range order Fe moments. Cr-jarosite fluctuations persist without signature freezing even at T = 25 mK, far...
We have performed dc magnetic susceptibility $(\ensuremath{\chi})$ and muon spin relaxation $(\ensuremath{\mu}\mathrm{SR})$ measurements of the Haldane system $({\mathrm{Y}}_{2\ensuremath{-}x}{\mathrm{Ca}}_{x})\mathrm{Ba}({\mathrm{Ni}}_{1\ensuremath{-}y}{\mathrm{Mg}}_{y}){\mathrm{O}}_{5}$, in which chain length is controlled by ${\mathrm{Ca}}^{2+}$ and/or ${\mathrm{Mg}}^{2+}$ doping. In nominally pure...
Zero-field muon spin rotation (ZF-μSR) studies in the recently synthesized organic ferromagnet β-phase p-NPNN are reported. Our measurements, using a microscopic magnetic probe, provide first direct observation of spontaneous order p-NPNN. The behaviour system is close to that an isotropic three-dimensional (3D) Heisenberg system.
The sustainable high yield of crops is critically important under the current situation global climate warming. In order to improve regional yield, it urgent clarify limiting factors local grain and change traditional planting measurements adapt warming make full use resources. Long-term field experiments over seven years from 2014 2021 were conducted with same maize cultivar (i.e., Luyu9105) density treatments: 3.0 × 104 (D1), 4.5 (D2), 6.0 (D3), 7.5 (D4), 9.0 (D5), 10.5 (D6), 12.0 (D7)...
Yield and its components are greatly affected by climate change. Adjusting the sowing date is an effective way to alleviate adverse effects adapt Aiming determine optimal of summer maize clarify contribution climatic variables grain yield components, a consecutive 4-year field experiment was conducted from 2016 2019 with four dates at 10-day intervals 5 June July. Analysis historical meteorological data showed that more solar radiation (SR) distributed early mid-August, maximum temperature...
Muon-spin-relaxation measurements have been performed in the orthorhombic phase of quasi-one-dimensional conductor ${\mathrm{RbC}}_{60}$. Evidence for static magnetic order was found at T\ensuremath{\le}70 K, followed by a change moment/structure below T\ensuremath{\sim}20 inferred from substantial increase random local fields. These results are consistent with formation spin-density-wave state, although possibility spin freezing cannot be ruled out.
We have studied flux-depinning phenomena in the ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8}$ (Bi 2:2:1:2) and Pb-doped ${\mathrm{Pb}}_{0.7}$${\mathrm{Bi}}_{1.3}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8}$ (Pb-Bi systems using transverse-field muon-spin-relaxation (\ensuremath{\mu}SR) technique. Comparison of field-cooled (FC) zero-field-cooled (ZFC) results with external fields applied along c axis single-crystal specimens defines an...
In the southern Huang-Huai-Hai (HHH) region, China, maize production is frequently threatened by waterlogging at seedling stage and drought big flare stage. A two-year field experiment was performed to explore whether subsoiling (SS) in winter wheat season could improve photosynthetic capacity increase water use efficiency (WUE) of summer using variety, Luyu9105. split design adopted experiment. The main plots used tillage practices, including SS rotary (RT). subplots consisted two...
A field experiment was performed to explore the compensation effects of different nitrogen (N) regimes on growth and photosynthetic capacity in leaf layers summer maize hybrid LuYu9105 under waterlogging at seedling stage. The results showed that significantly decreased maximum green area (gLA) by 10.0~15.3% 9.3~22.5%, mainly due reduction below-ear layer leaves silking stage 2014 2015, respectively. Waterlogging also ear rate (PN), Fv/Fm, Fv/Fo, ΦPSII qP mid- late-filling stages, which...
We have performed muon spin relaxation (\ensuremath{\mu}SR) measurements of polycrystalline specimens ${\mathrm{Y}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{U}}_{\mathit{x}}$${\mathrm{Pd}}_{3}$ with x=0.1, 0.2, 0.4, and ${\mathrm{UPd}}_{4}$. demonstrate that ${\mathrm{UPd}}_{4}$ ${\mathrm{Y}}_{0.6}$${\mathrm{U}}_{0.4}$${\mathrm{Pd}}_{3}$ exhibit glass order, while the predominant volume fraction remains nonmagnetic at T\ensuremath{\rightarrow}0 in...
We report zero-field muon spin rotation studies of the organic compound (TMTSF)2PF6 at ambient pressure. An extremely sharp onset density wave state (SDW) is observed below transition temperature TM = 12.2 K, which may be first order in nature. The saturation magnetic low temperatures can ascribed to existence SDW gap. broad distribution local fields deduced from μSR time spectra consistent with that expected an incommensurate SDW.