Putzke Carsten, Ayres Jake, Buhot Jonathan, Licciardello Salvatore, Hussey Nigel E, Friedemann Sven, Carrington Antony
H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom.
High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, Nijmegen 6525 ED, Netherlands.
Phys Rev Lett. 2018 Mar 16;120(11):117002. doi: 10.1103/PhysRevLett.120.117002.
In underdoped cuprates, an incommensurate charge density wave (CDW) order is known to coexist with superconductivity. A dip in T_{c} at the hole doping level where the CDW is strongest (n_{p}≃0.12) suggests that CDW order may suppress superconductivity. We investigate the interplay of charge order with superconductivity in underdoped YBa_{2}Cu_{3}O_{7-δ} by measuring the temperature dependence of the Hall coefficient R_{H}(T) at high magnetic field and at high hydrostatic pressure. We find that, although pressure increases T_{c} by up to 10 K at 2.6 GPa, it has very little effect on R_{H}(T). This suggests that pressure, at these levels, only weakly affects the CDW and that the increase in T_{c} with pressure cannot be attributed to a suppression of the CDW. We argue, therefore, that the dip in T_{c} at n_{p}≃0.12 at ambient pressure is probably not caused by the CDW formation.
在欠掺杂铜酸盐中，已知一种非公度电荷密度波（CDW）序与超导性共存。在CDW最强的空穴掺杂水平（(n_p)≃0.12）处，(T_c)出现下降，这表明CDW序可能会抑制超导性。我们通过测量高磁场和高静水压力下霍尔系数(R_H(T))的温度依赖性，研究了欠掺杂(YBa_2Cu_3O_{7 - \delta})中电荷序与超导性之间的相互作用。我们发现，尽管在2.6 GPa时压力使(T_c)升高了多达10 K，但它对(R_H(T))的影响非常小。这表明在这些压力水平下，压力仅对CDW有微弱影响，并且(T_c)随压力的增加不能归因于CDW的抑制。因此，我们认为在常压下(n_p)≃0.12处(T_c)的下降可能不是由CDW的形成引起的。
