Gapless spin excitations in superconducting La2-xCa1+xCu2O6 with T-c up to 55K

Article

关键词: SINGLE-CRYSTAL GROWTH;    NEUTRON-SCATTERING;    MAGNETIC EXCITATIONS;    ANTIFERROMAGNETISM;    SPECTRUM;   

DOI  :  10.1103/PhysRevB.99.174515

来源: SCIE

【 摘 要 】

We report inelastic neutron scattering on single crystals of the bilayer cuprate family La2-xCa1+ xCu2O6+delta, including two crystals made superconducting (transitions at 45 and 55 K) by high-pressure annealing in an oxygen-containing atmosphere. The magnetic excitations in the nonsuperconducting crystal have a similar temperature dependence as those in weakly hole-doped cuprates. In the superconducting crystals, there is a near-uniform suppression of the magnetic spectral weight with increasing temperature; in particular, there are no signs of a spin gap or resonance peak. This is different from the temperature dependence seen in many optimally doped cuprates but similar to the behavior seen in certain underdoped cuprates. We discuss the possible connection with pair-density-wave superconductivity.

【 授权许可】

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