Yen Fei

activity

20072025

most citedPressure-driven dome-shaped superconductivity and electronic structural evolution in tungsten ditelluride

414 citations · 586 across the 16 of their papers we have counts for

collaborators

16 papers

cond-mat.mtrl-sci2025

Colossal Dielectric Response and Electric Polarization in Lithium Nitrate

Na Du, Yan Zhao, Enting Xu +3

Lithium nitrate LiNO $_{3}$ is identified to possess a dielectric constant $ε$ ' larger than 6x10 $^{6}$ at 1 kHz in powder samples above the critical temperature $T$ $_{W}$ = 306 K. For sin…

cond-mat.mtrl-sci2025

Magnetism based on nitrate-nitrate interactions: The cases of LiNO $_{3}$ , K $_{0.5}$ Rb $_{0.5}$ NO $_{3}$ , Ca(NO $_{3}$ ) $_{2}$ and C(NH $_{2}$ ) $_{3}$ NO $_{3}$

Na Du, Xintian Wang, Ruo Tong Wang +5

Long-range magnetic ordering of the orbital motion of oxygen atoms within NO $_{3}$ $^{-}$ cations is identified from experimental measurements of the magnetic susceptibility $χ$ ( $T$ ) in…

physics.chem-ph2025

Gearing of nitrate ions in ammonium nitrate

Na Du, Xintian Wang, Yu Ying Zhu +3

Reorienting polyatomic ions such as NH4+ and NO3- exhibit weak magnetic fields because the ions at the extremities trace out current loops; if the periodic reorientations become lo…

cond-mat.mtrl-sci2024★ 5 cited

Inducing ferroelectricity in NH $_{4}$ I and NH $_{4}$ Br via partial replacement of protons by deuterons

Miao Miao Zhao, Lei Meng, Yi Yang Xu +2

While all of the polymorphs of NH $_{4}$ I and NH $_{4}$ Br are non-polar, a reversible electric polarization is established in the ordered $γ$ phases of (NH $_{4}$ ) $_{0.73}$ (ND $_{4}$ ) $_{0.27}$ …

cond-mat.mtrl-sci2024★ 3 cited

Electric Polarization and Magnetic Properties of (NH $_{4}$ ) $_{1 - x}$ K $_{x}$ I (x = 0.05-0.17)

Yi Yang Xu, Lei Meng, Miao Miao Zhao +2

While all of the polymorphs of pure NH $_{4}$ I and KI are non-polar, we identify that (NH $_{4}$ ) $_{0.95}$ K $_{0.05}$ I is ferroelectric and (NH $_{4}$ ) $_{0.87}$ K $_{0.13}$ I and (NH $_{4}$ )$_{0.8…

cond-mat.mtrl-sci2024★ 3 cited

Ferroelectricity Driven by Orbital Resonance of Protons in CH $_{3}$ NH $_{3}$ Cl and CH $_{3}$ NH $_{3}$ Br

Chu Xin Peng, Lei Meng, Yi Yang Xu +4

The $β$ and $γ$ phases of methylammonium chloride CH $_{3}$ NH $_{3}$ Cl and methylammonium bromide CH $_{3}$ NH $_{3}$ Br are identified to be ferroelectric $v ia$ pyroelectric current and dielect…

cond-mat.mtrl-sci2024★ 5 cited

Magnetic interactions based on proton orbital motion in CH $_{3}$ NH $_{3}$ PbI $_{3}$ and CH $_{3}$ NH $_{3}$ PbBr $_{3}$

Lei Meng, Miao Miao Zhao, Yi Yang Xu +5

The microscopic origin of the remarkable optoelectronic properties of one of the most studied contemporary materials remains unclear. Here, we identify the existence of magnetic in…

cond-mat.mtrl-sci2024★ 6 cited

Magnetic Properties of NH $_{4}$ H $_{2}$ PO $_{4}$ and KH $_{2}$ PO $_{4}$ : Emergence of Multiferroic Salts

Lei Meng, Chen He, Wei Ji +1

We observe sharp step-down discontinuities in the magnetic susceptibility of NH $_{4}$ H $_{2}$ PO $_{4}$ and NH $_{4}$ H $_{2}$ PO $_{4}$ - $d$ $_{60}$ (60% deuterated) along the $a$ and $c$ -axes occurrin…

cond-mat.mtrl-sci2024★ 6 cited

Magnetoelectric Coupling Based on Protons in Ammonium Sulfate

Lei Meng, Chen He, Fei Yen

Most ferroelectric crystals have their own set of unique characteristics and ammonium sulfate (NH $_{4}$ ) $_{2}$ SO $_{4}$ is no exception. We report on two previously unidentified features…

cond-mat.mtrl-sci2024★ 2 cited

Determining the chemical composition of diamagnetic mixed solids via measurements of the magnetic susceptibility

Miao Miao Zhao, Yang Yang, Na Du +3

Mixed solid compounds are employed in a vast array of applications so an accurate determination of their chemical compositions is of crucial importance. All current characterizatio…

physics.chem-ph2017★ 1 cited

Indirect observation of molecular disassociation in solid benzene at low temperatures

F. Yen, S. Z. Huang, S. X. Hu +2

The molecular dynamics of solid benzene are extremely complex; especially below 77 K, its inner mechanics remain mostly unexplored. Benzene is also a prototypical molecular crystal…

physics.chem-ph2015★ 33 cited

Dielectric Anomaly in Ice near 20 K; Evidence of Macroscopic Quantum Phenomena

Fei Yen, Tian Gao

H2O is one of the most important substances needed in sustaining life; but yet not much is known about its ground state. Here, a previously unidentified anomaly is identified in th…

cond-mat.supr-con2015★ 414 cited

Pressure-driven dome-shaped superconductivity and electronic structural evolution in tungsten ditelluride

Xing-Chen Pan, Xuliang Chen, Huimei Liu +12

Tungsten ditelluride has attracted intense research interest due to the recent discovery of its large unsaturated magnetoresistance up to 60 Tesla. Motivated by the presence of a s…

physics.chem-ph2015★ 10 cited

Dielectric Anomalies in Crystalline Ice: Indirect Evidence of the Existence of a Liquid-Liquid Critical Point in H2O

Fei Yen, Zhenhua Chi, Adam Berlie +2

The phase diagram of H2O is extremely complex, in particular, it is believed that a second critical point exists deep below the supercooled water (SCW) region where two liquids of…

cond-mat.mtrl-sci2014

Backbone NxH Compounds at High Pressures

Alexander F. Goncharov, Nicholas Holtgrewe, Guangrui Qian +11

Optical and synchrotron x-ray diffraction diamond anvil cell experiments have been combined with first principles theoretical structure predictions to investigate mixed N2 and H2 u…

cond-mat.str-el2007★ 98 cited

Magnetic Phase Diagrams of Multiferroic Hexagonal RMnO3 (R=Er, Yb, Tm, and Ho)

F. Yen, C. dela Cruz, B. Lorenz +4

The magnetic phase diagrams of RMnO3 (R = Er, Yb, Tm, Ho) are investigated up to 14 Tesla via magnetic and dielectric measurements. The stability range of the AFM order below the N…