More Like this

1. Optimizing $n$ -type doping of ${\mathrm{ZnGeN}}_2$ and ${\mathrm{ZnSiN}}_2$

   https://doi.org/10.1103/PhysRevB.100.155206  

   Adamski, Nicholas L.; Zhu, Zhen; Wickramaratne, Darshana; Van de Walle, Chris G. (October 2019, Physical Review B)

   null (Ed.)
2. Route to high- $T_c$ superconductivity via ${\mathrm{CH}}_4$ -intercalated ${\mathrm{H}}_3\mathrm{S}$ hydride perovskites

   https://doi.org/10.1103/PhysRevB.101.134504  

   Cui, Wenwen; Bi, Tiange; Shi, Jingming; Li, Yinwei; Liu, Hanyu; Zurek, Eva; Hemley, Russell J. (April 2020, Physical Review B)
3. High- $T_c$ superconductivity in ${\mathrm{CaKFe}}_4{\mathrm{As}}_4$ in absence of nematic fluctuations

   https://doi.org/10.1103/PhysRevB.98.140501  

   Zhang, W.-L.; Meier, W. R.; Kong, T.; Canfield, P. C.; Blumberg, G. (October 2018, Physical Review B)
4. Quantum phases in the honeycomb-lattice $J_1$ – $J_3$ ferro-antiferromagnetic model

   https://doi.org/10.1103/PhysRevB.108.L180406  

   Jiang, Shengtao; White, Steven R; Chernyshev, A L (November 2023, Physical Review B)

   Using large-scale density-matrix renormalzation group calculations and minimally augmented spin-wave theory, we demonstrate that the phase diagram of the quantum 𝑆=1/2 𝐽1–𝐽3 ferro-antiferromagnetic model on the honeycomb lattice differs dramatically from the classical one. It hosts the double-zigzag and Ising-𝑧 phases as unexpected intermediaries between ferromagnetic and zigzag states that are also extended beyond their classical regions of stability. In broad agreement with quantum order-by-disorder arguments, these collinear phases replace the classical spiral state. 

   more » « less
5. Tripling of the superconducting critical current density in BaFe ${}_2$ (As ${}_{1-x}$ P ${}_x$ ) ${}_2$ retained after pressure release

   https://doi.org/10.1088/1361-6668/ae702f  

   Liu, Jiangteng; Lopez, Alex; Slone, Daniel; Ren, Guodong; Liu, Zhaoyu; Idrobo, Juan-Carlos; Chu, Jiun-Haw; Eley, Serena (June 2026, Superconductor Science and Technology)

   Abstract Superconducting performance is tunable not only via chemical modification or defect engineering, but also through external parameters such as pressure, though this method remains less readily accessible. In this work, we study how compression influences vortex dynamics and critical currents in an iron-based superconductor. Specifically, we perform magnetization measurements using an off-the-shelf pressure cell to investigate the effects of hydrostatic pressures up to 1.08 GPa on the magnetic properties of BaFe ${}_2$(As ${}_{0.62}$P ${}_{0.38}$) ${}_2$crystals across a range of temperatures $T$and magnetic fields $H$. Although these pressures minimally affect the superconducting critical temperature, they produce a clear increase in the critical current density $J_{\mathrm{c}}(T,H)$, a pronounced reduction in the rate of thermally activated vortex motion $S(T,H)$, and can change the dominant vortex pinning mechanism. Furthermore, the effects of pressure are irreversible: after pressurization and subsequent release at room temperature, high-density microcracks are observed and the crystals retain their enhanced critical current densities. The second magnetization peak vanishes above 18 K after the pressure cycle, which we attribute to a transition from predominantly $\delta \kappa$pinning to a mixed mechanism of $\delta T_{\mathrm{c}}$and surface pinning. Lastly, a threefold increase in $J_{\mathrm{c}}$, a more than 40% reduction in $S$at 8 K and 0.5 T, and an expanded elastic-creep region were achieved after $1-2$pressure cycles. These findings demonstrate the potential utility of pressure cycling for improving $J_{\mathrm{c}}$, which may offer a simpler alternative compared to approaches such as chemical doping or the introduction of artificial pinning centers. 

   more » « less