Kinetic approach to superconductivity hidden behind a competing order.
Kinetic approach to superconductivity hidden behind a competing order.
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DOI：
10.1126/sciadv.aau3489
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发表时间：
2018-10
期刊：
影响因子：
13.6
通讯作者：
Kagawa F
中科院分区：
文献类型：
--
作者：
Oike H;Kamitani M;Tokura Y;Kagawa F
用电脉冲证明了超导的非易失性和可逆开关。超导性的探索是凝聚态物理的研究前沿之一。在强相关电子系统中，超导性的出现通常被热力学上更稳定的磁荷序的形成所抑制。因此，为了使超导成为热力学上最稳定的状态，主要通过改变物理/化学压力和载流子密度等热力学参数来控制超导与竞争序之间的自由能平衡。然而，这种热力学方法可能不是实现超导性的唯一途径。我们提出了一种新的动力学方法来避免竞争顺序，从而诱导持久超导。以过渡金属二硫族化合物IrTe2为例，通过使用高达~107 K s−1的电流脉冲快速冷却，我们成功地从动力学上避免了一阶相变到竞争电荷阶，并揭示了隐藏在其背后的亚稳超导性。由于低温下的电子状态取决于热猝灭的历史，电脉冲应用可以实现亚稳态超导的非易失性和可逆开关，这是动力学方法的独特优势。因此，我们的发现提供了一种超越热力学框架发展和操纵超导性的新方法。
Nonvolatile and reversible switching of superconductivity has been demonstrated with electric pulses. Exploration for superconductivity is one of the research frontiers in condensed matter physics. In strongly correlated electron systems, the emergence of superconductivity is often inhibited by the formation of a thermodynamically more stable magnetic/charge order. Thus, to develop the superconductivity as the thermodynamically most stable state, the free-energy balance between the superconductivity and the competing order has been controlled mainly by changing thermodynamic parameters, such as the physical/chemical pressure and carrier density. However, such a thermodynamic approach may not be the only way to materialize the superconductivity. We present a new kinetic approach to avoiding the competing order and thereby inducing persistent superconductivity. In the transition-metal dichalcogenide IrTe2 as an example, by using current pulse–based rapid cooling of up to ~107 K s−1, we successfully kinetically avoid a first-order phase transition to a competing charge order and uncover metastable superconductivity hidden behind. Because the electronic states at low temperatures depend on the history of thermal quenching, electric pulse applications enable nonvolatile and reversible switching of the metastable superconductivity, a unique advantage of the kinetic approach. Thus, our findings provide a new approach to developing and manipulating superconductivity beyond the framework of thermodynamics.
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影响因子：
64.8
作者：
Caviglia, A. D.;Gariglio, S.;Triscone, J. -M.
通讯作者：
Triscone, J. -M.
影响因子：
8.6
作者：
Eom, Man Jin;Kim, Kyoo;Kim, Jun Sung
通讯作者：
Kim, Jun Sung
影响因子：
4.4
作者：
TURNBULL, D
通讯作者：
TURNBULL, D
DOI：
10.1073/pnas.1703016114
发表时间：
2017-05-23
影响因子：
11.1
作者：
Rosa, P. F. S.;Kang, J.;Thompson, J. D.
通讯作者：
Thompson, J. D.
影响因子：
8.6
作者：
Yang, J. J.;Choi, Y. J.;Cheong, S-W.
通讯作者：
Cheong, S-W.