Gapless spin excitations in superconducting La2-xCa1+xCu2 O6 with Tc up to 55 K

John A. Schneeloch; Ruidan Zhong; M. B. Stone; I. A. Zaliznyak; G. D. Gu; Guangyong Xu; J. M. Tranquada

doi:10.1103/PhysRevB.99.174515

Gapless spin excitations in superconducting La_2-xCa_1+xCu₂ O₆ with Tc up to 55 K

John A. Schneeloch, Ruidan Zhong, M. B. Stone, I. A. Zaliznyak, G. D. Gu, Guangyong Xu, J. M. Tranquada

Spectroscopy

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Abstract

We report inelastic neutron scattering on single crystals of the bilayer cuprate family La2-xCa1+xCu2O6+δ, 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.

Original language	English
Article number	174515
Journal	Physical Review B
Volume	99
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.99.174515
State	Published - May 22 2019

Funding

The work at Brookhaven was supported by the Office of Basic Energy Sciences, US Department of Energy (DOE) under Contract No. DE-SC0012704. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

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title = "Gapless spin excitations in superconducting La2-xCa1+xCu2 O6 with Tc up to 55 K",

abstract = "We report inelastic neutron scattering on single crystals of the bilayer cuprate family La2-xCa1+xCu2O6+δ, 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.",

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AU - Schneeloch, John A.

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AU - Zaliznyak, I. A.

AU - Gu, G. D.

AU - Xu, Guangyong

AU - Tranquada, J. M.

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AB - We report inelastic neutron scattering on single crystals of the bilayer cuprate family La2-xCa1+xCu2O6+δ, 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.

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Gapless spin excitations in superconducting La_2-xCa_1+xCu₂ O₆ with Tc up to 55 K

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