2020/08/31 by Debmalya Chakraborty, Annica M Black-Schaffer, Annica M. Black-Schaffer
Materials Science · Physics and Astronomy · #Brillouin zone #Charge density #Charge density wave #Cooper pair #Cuprate #Density wave theory #Electronic and Structural Properties of Oxides #Iron-based superconductors research #Modulation (music) #Physics of Superconductivity and Magnetism #Superconductivity #Wave vector #cond-mat.supr-con
paper · pdf · doi:10.1088/1367-2630/abe15d
published as New J. Phys. 23, 033001 (2021) · Published version
openalex publication_date 2021/01/29 · openalex created_date 2021/02/15 · arxiv created 2021/03/04 · arxiv updated 2021/03/08 · openalex updated_date 2026/08/05
Abstract Pair density waves, identified by Cooper pairs with finite center-of-mass momentum, have recently been observed in copper oxide based high T c superconductors (cuprates). A charge density modulation or wave is also ubiquitously found in underdoped cuprates. Within a general mean-field one-band model we show that the coexistence of charge density waves (CDWs) and uniform superconductivity in d-wave superconductors like cuprates, generates an odd-frequency spin-singlet pair density wave, in addition to the even-frequency counterparts. The strength of the induced odd-frequency pair density wave depends on the modulation wave vector of the CDW, with the odd-frequency pair density waves even becoming comparable to the even-frequency ones in parts of the Brillouin zone. We show that a change in the modulation wave vector of the CDW from bi-axial to uni-axial, can enhance the odd-frequency component of the pair density waves. Such a coexistence of superconductivity and uni-axial CDW has already been experimentally verified at high magnetic fields in underdoped cuprates. We further discuss the possibility of an odd-frequency spin-triplet pair density wave generated in the coexistence regime of superconductivity and spin density waves, applicable to the iron-based superconductors. Our work thus presents a route to bulk odd-frequency superconductivity in high T c superconductors.