Scanning tunneling spectroscopic evidence for magnetic-field–induced microscopic orders in the high-Tc superconductor YBa2Cu3O7-

A. D. Beyer; M. S. Grinolds; M. L. Teague; S. Tajima; N.-C. Yeh

doi:10.1209/0295-5075/87/37005

All issues

Volume 87 / No 3 (August 2009)

EPL, 87 3 (2009) 37005

Abstract

Issue		EPL Volume 87, Number 3, August 2009


Article Number		37005
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/87/37005
Published online		26 August 2009

EPL, 87 (2009) 37005

Scanning tunneling spectroscopic evidence for magnetic-field–induced microscopic orders in the high-T_c superconductor YBa₂Cu₃O_7- $_{\delta}$

A. D. Beyer¹, M. S. Grinolds¹, M. L. Teague¹, S. Tajima² and N.-C. Yeh¹

¹ Department of Physics, California Institute of Technology - Pasadena, CA 91125, USA
² Department of Physics, Osaka University - Osaka 560-0043, Japan

Corresponding author: ncyeh@caltech.edu

Received: 5 April 2009
Accepted: 23 July 2009

Abstract

We report spatially resolved tunneling spectroscopic evidence for field-induced microscopic orders in the high-T_c superconductor YBa₂Cu₃O_7- $_{\delta}$ . The spectral characteristics inside vortices reveal a pseudogap $(V_{{\mathrm {CO}}})$ larger than the superconducting gap $(\Delta _{{\rm SC}})$ as well as a subgap $(\Delta ^\prime )$ smaller than $\Delta _{{\mathrm {SC}}}$ , and the spectral weight shifts steadily from $\Delta _{{\mathrm {SC}}}$ to $V_{{\mathrm {CO}}}$ and $\Delta ^\prime$ upon increasing magnetic field. Additionally, energy-independent conductance modulations at 3.6 and 7.1 lattice constants along the Cu-O bonding directions and at 9.5 lattice constants along the nodal directions are manifested in the vortex state. These wave vectors differ fundamentally from the strongly dispersive modes due to Bogoliubov quasiparticle scattering interferences and may be associated with field-induced microscopic orders of pair-, charge- and spin-density waves.

PACS: 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 74.25.Op – Mixed states, critical fields, and surface sheaths / 74.72.Bk – Y-based cuprates

© EPLA, 2009

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