Welcome to HPSynC
A Gateway for High-Pressure Scientists to Beamlines of the APS

The origin of ultrahigh piezoelectricity in relaxor-ferroelectric solid solution crystals.
The origin of uptrahigh piezoelectricity in relaxor-ferroelectric solid solution crystals
Over last 60 years, efforts to enhance piezoelectricity generally resort to tuning the long-range ferroelectric phase transition. In the work published in the recent issue of Nature Communications (doi:10.1038/ncomms13807), the researchers revealed that small amount of nanoscale local inhomogeneity may dramatically improve the piezoelectric responses (50-80%) of a ferroelectric crystal.More...

Pressure-Induced Bandgap Optimization in Lead-Based Perovskites with Prolonged Carrier Lifetime and Ambient Retainability
Pressure-Induced Bandgap Optimaization in Lead-Based Perovskites with Prolonged Carrier Lifetime and Ambient Retainability
For the first time, scientists have reached the Shockley-Queisser theory optimized bandgap for single-junction solar cells in lead-based perovskites. A new study led by HPSTAR scientists Dr.Gang Liu and Dr. Dave Mao, report an unprecedentedly tuned bandgap of the Shockley–Queisser limit and double-prolonged carrier lifetime in formamidinium lead triiodide (HC(NH2)2PbI3) in the latest issue of Advanced Functional Materials (DOI: 10.1002/adfm.201604208).More...

Pressure-Driven Cooperative Spin-Crossover, Large-Volume Collapse, and Semiconductor-to-Metal Transition in Manganese(II) Honeycomb Lattices
Pressure-Driven Cooperative Spin-Crossover
Spin crossover (SCO), an intriguing phenomenon that magnetic ions can switch between high-spin (HS) and low-spin (LS) states in response to light irradiation or temperature, is mostly observed as a spectacular molecular magnetism in 3d4-3d7 metal complexes. A joint team of researchers from UNLV, HPSynC and HPSTAR reported their breakthrough in pursuing "cooperative" pressure-driven SCO in J. Am. Chem. Soc. (DOI: 10.1021/jacs.6b10225). An abrupt pressure-driven SCO accompanying with large lattice collapses and semiconductor-to-metal transitions was achieved in two-dimensional honeycomb lattices, MnPS3 and MnPSe3, for the first time. The work opens a new avenue for the exploration of pressure-responsive multifunctional materials. More...

Pressure-Induced New Topological Weyl Semimetal Phase in TaAs
TaAs
A joint team co-led by HPSTAR scientist Wenge Yang studied the envolution of electronic and structural properties of Weyl semimetal TaAs using multiple methods. They found a pressure-induced new Weyl semimetallic phase with isoenergetic 12 Weyl nodes in TaAs. The study is published in the journal Physical Reviews Letters (DOI:https://doi.org/10.1103/PhysRevLett.117.146402). More...

Enhanced Structural Stability and Photo Responsiveness of CH3NH3SnI3 Perovskite via Pressure-Induced Amorphization and Recrystallization
CH3NH3Snl3
As part of a team led by Dr. Xujie Lü from Los Alamos National Laboratory, HPSTAR scientists Dr. Qingyang Hu and Dr. Wenge Yang recently conducted the first comparative study of a lead-free tin halide perovskite, CH3NH3SnI3, before and after high-pressure treatment up to 30 GPa at HPCAT. It became more stable after high-pressure treatment, with a three-fold increase in electrical conductivity and enhanced light absorption. (DOI: 10.1002/adma.201600771)
More...

See more...