[PC1] Cuprates

10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)

[PC1-03] Pressure-induced resistivity upturn in stripe-ordered cuprate superconductor La_1.6-xNd_0.4Sr_xCuO₄

*Masamichi Nakajima¹, Ryo Motobayashi², Chieko Terakura¹, Yoshinori Tokura^1,2,3 (1. RIKEN Center for Emergent Matter Science (Japan), 2. Department of Applied Physics, The University of Tokyo (Japan), 3. Tokyo College, The University of Tokyo (Japan))

Keywords:

Cuprate superconductor,LNSCO,Stripe order,Transport properties,Pressure effect

Elucidating the relationship between superconductivity and charge order is one of the central issues of high-temperature superconducting cuprates. La_1.6-xNd_0.4Sr_xCuO₄ (LNSCO) shows charge and spin stripe order, which appears covering a superconducting dome in the electronic phase diagram. It has been known that pressure effectively suppresses a low-temperature tetragonal (LTT) phase, in which the charge order is stabilized. To investigate a pressure effect on the electronic state in LNSCO, we measured in-plane resistivity of LNSCO under pressure up to 20 GPa. Application of pressure suppressed the LTT phase and hence the stripe order, resulting in an increase in a superconducting transition temperature T_c. We revealed that a resistivity upturn appears at higher pressures, correlated with a T_c decrease. The high-pressure resistivity upturn was universally observed from underdoped to overdoped regime. At the verge of the superconducting dome (x = 0.25), however, the high-pressure resistivity upturn was absent. The pressure-induced resistivity upturn, which would originate from a charge order distinct from the stripe order at low pressures, likely appears in the doping range in which superconductivity occurs.