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Observation of a bi-critical point between antiferromagnetic and superconducting phases in pressurized single crystal Ca0.73La0.27FeAs2

引用

science Bulletin 2017年第12期62卷 857-862页

作者： Yazhou Zhou shanJiang Qi wu Vladimir A.sidorov Jing Guo Wei Yi shan Zhang Zhe Wang HonghongWang shu Cai Ke Yang sheng Jiang Aiguo Li Ni Ni Guangming Zhang Liling sun Zhongxian Zhao Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of SciencesBeijing 100190China Department of Physics and Astronomy UCIALos AngelesCA 90095USA Institute for High Pressure Physics Russian Academy of Sciences142190 TroitskMoscowRussia shanghai synchrotron Radiation Facilities Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China state Key Laboratory for Low Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBelting 100084China Collaborative Innovation Center of Quantum Matter Beijing 100190China university of Chinese Academy of sciences Beijing 100190China

One of the most strikingly universal features of the high-temperature superconductors is that the superconducting phase emerges in the close proximity of the antiferromagnetic phase, and the interplay between these two phases poses a long-standing challenge. It is commonly believed that, as the antiferromagnetic transition temperature is continuously suppressed to zero, there appears a quantum critical point, around which the existence of antiferromagnetic fluctuation is responsible for the development of the superconductivity. In contrast to this scenario, we report the observation of a bi-critical point identified at 2.88 GPa and 26.02 K in the pressurized high-quality single crystal Ca_(0.73)La_(0.27)FeAs_2 by complementary in-situ high pressure measurements. At the critical pressure, we find that the antiferromagnetism suddenly disappears and superconductivity simultaneously emerges at almost the same temperature, and that the external magnetic field suppresses the superconducting transition temperature but hardly affects the antiferromagnetic transition temperature.

关键词：超导单晶反铁磁性临界点加压磁转变温度超导转变温度高温超导体相互作用

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