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Evolution of Magnetic Double Helix and Quantum Criticality near a Dome of Superconductivity in CrAs by Matsuda, M.; Lin, F. K.; Yu, R.; Cheng, J. -G.; Wu, W.; Sun, J. P.; Zhang, J. H.; Sun, P. J.; Matsubayashi, K.; Miyake, T.; Kato, T.; Yan, J. -Q.; Stone, M. B.; Si, Qimiao; Luo, J. L.; Uwatoko, Y. is a scholarly article available to read on EtoBox.

What is Evolution of Magnetic Double Helix and Quantum Criticality near a Dome of Superconductivity in CrAs about?

At ambient pressure CrAs undergoes a first-order transition into a double-helical magnetic state at TN = 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 its coupled structural/helimagnetic order. Here we show, via neutron diffraction on the single-crystal CrAs under hydrostatic pressure (P), that the combined order is suppressed at Pc ~ 10 kbar, near which bulk superconductivity develops with a maximal transition temperature Tc ~ 2 K. We further show that the coupled order is also completely suppressed by phosphorus doping in CrAs1-xPx at a critical xc ~ 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 Pc (xc), the A coefficient of the quadratic temperature dependence of resistivity exhibits a dramatic enhancement as P (x) approaches Pc (xc), around which Res(T) has a non-Fermi-liquid form. Accordingly, the electronic specific-heat coefficient of CrAs1-

Author

Matsuda, M.; Lin, F. K.; Yu, R.; Cheng, J. -G.; Wu, W.; Sun, J. P.; Zhang, J. H.; Sun, P. J.; Matsubayashi, K.; Miyake, T.; Kato, T.; Yan, J. -Q.; Stone, M. B.; Si, Qimiao; Luo, J. L.; Uwatoko, Y.

Published

2019

Language

EN