苏州大学

报告摘要：

The nature of the unconventional superconductivity (SC) in cuprates has been a long-standing puzzle. One of the central questions is to understand the normal state from which the SC originates. In this regard, high magnetic field has been commonly used to suppress SC and reveal the normal state. However, the strong SC in cuprates often preclude access to the normal state in the T=0 limit using experimentally available magnetic field. Moreover, the interplay of various competing orders in underdoped cuprates also plays a key role in determining the ground state and its effect is yet to be understood in the limit of high magnetic fields.

In this talk, I will discuss the main results of a series of experiments [1-3] performed using several complementary electrical transport techniques on underdoped La-214 cuprates where charge and spin orders form stripes near the 1/8 doping. Our results a) establish a robust vortex phase diagram for underdoped cuprates, b) provide much-needed transport signatures of the elusive pair-density wave state in stripe-ordered cuprates in high magnetic fields, and c) reveal striking, novel properties of the high-field normal state of cuprates. The implications of these results for cuprate research in general will also be discussed.

[1] Zhenzhong Shi et al., Sci. Adv. 6, eaay8946 (2020).

[2] Zhenzhong Shi et al., Nat. Commun. 11, 3323 (2020).

[3] Zhenzhong Shi et al., arXiv:1909.02491; to appear in Nat. Commun. (2021).

报告人简介：

史振中，苏州大学特聘教授，博士生导师。2006年本科毕业于中国科学技术大学，2013年于纽约州立大学布法罗分校获得博士学位。2013-2021年分别在美国强磁场国家实验室和杜克大学从事博士后研究工作。2021年起任职于苏州大学物理科学与技术学院高等研究院。研究方向包括非常规超导体和量子磁体，在Science Advances和Nature Communications等期刊发表论文十余篇。

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