• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical Review X >Evolution of Magnetic Double Helix and Quantum Criticality near a Dome of Superconductivity in CrAs
【24h】

Evolution of Magnetic Double Helix and Quantum Criticality near a Dome of Superconductivity in CrAs

机译：磁性双螺旋磁性双螺旋的演变与CRAS中超导电性圆顶附近的量子临界性

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

At ambient pressure, CrAs undergoes a first-order transition into a double-helical magnetic state at T N = 265 K , which is accompanied by a structural transition. The recent discovery of pressure-induced superconductivity in CrAs makes it important to clarify the nature of quantum phase transitions out of the coupled structural/helimagnetic order in this system. Here, we show, via neutron diffraction on the single-crystal CrAs under hydrostatic pressure ( P ), that the combined order is suppressed at P c ≈ 10 kbar , near which bulk superconductivity develops with a maximal transition temperature T c ≈ 2 K . We further show that the coupled order is also completely suppressed by phosphorus doping in CrAs 1 ? x P x at a critical x c ≈ 0.05 , above which inelastic neutron scattering evidenced persistent antiferromagnetic correlations, providing a possible link between magnetism and superconductivity. In line with the presence of antiferromagnetic fluctuations near P c ( x c ) , the A coefficient of the quadratic temperature dependence of resistivity exhibits a dramatic enhancement as P ( x ) approaches P c ( x c ) , around which ρ ( T ) has a non-Fermi-liquid form. Accordingly, the electronic specific-heat coefficient of CrAs 1 ? x P x peaks around x c . These properties provide clear evidence for quantum criticality, which we interpret as originating from a nearly second-order helimagnetic quantum phase transition that is concomitant with a first-order structural transition. Our findings in CrAs highlight the distinct characteristics of quantum criticality in bad metals, thereby bringing out new insights into the physics of unconventional superconductivity such as those occurring in the high- T c iron pnictides.
机译：在环境压力下，CRA在T n = 265 k处经过一阶转变为双螺旋磁状态，其伴随着结构转变。最近在CRA中的压力诱导的超导性发现使得阐明了该系统中耦合结构/先眠阶的量子阶段过渡的性质。这里，我们在静压压力（P）下的单晶CRA上的中子衍射通过中子衍射（P）在PC≈10kbar下抑制了组合阶，散装超导率与最大转变温度TC≈2K发育。我们进一步表明，Cras 1中的磷掺杂也完全抑制了耦合顺序？ x p x处于临界xc≈05，上面是非弹性中子散射证明了持久的反铁磁性相关性，提供了磁性和超导之间的可能链路。根据P C（XC）附近的反铁磁体波动的存在，电阻率的二次温度依赖性的系数表现出剧烈的增强，因为P（x）接近P C（XC），ρ（t）具有非-Fermi-液体形式。因此，Cras 1的电子特定热量系数？ x p x周围x c峰值。这些性质为量子临界性提供了明确的证据，我们将其解释为源自几乎二阶的直升机量子相转变，这些转变伴随着一阶结构转变。我们在CRA中的研究结果突出了不良金属中量子临界性的不同特征，从而将新的见解进入非传统超导性的物理学，例如在高于高于高于高C铁毒率中发生的物理学。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号