Ubiquitous V-Shape Density of States in a Mixed State of Clean Limit Type II Superconductors

N. Nakai, P. Miranović, M. Ichioka, H. F. Hess, K. Uchiyama, H. Nishimori, S. Kaneko, N. Nishida, and K. Machida
Phys. Rev. Lett. 97, 147001 – Published 3 October 2006

Abstract

It is demonstrated theoretically and experimentally that the low energy density of states N(E) is described by a singular V-shape form N(E)=N0(H)+α|E|+O(E2) for all clean superconductors in a vortex state, irrespective of the underlying gap structure. The linear term α|E| which has not been recognized so far is obtained by exactly evaluating the vortex contribution. Based on microscopic Eilenberger theory N(E) is evaluated for the isotropic gap, line, and point-node gaps to yield a V-shape N(E). Scanning tunneling spectroscopy-STM experiments on NbSe2 and YNi2B2C give direct evidence for this. We provide arguments on the significance of this finding and on the relevance to other experiments.

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  • Received 15 May 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.147001

©2006 American Physical Society

Authors & Affiliations

N. Nakai1,*, P. Miranović2, M. Ichioka1, H. F. Hess3, K. Uchiyama4, H. Nishimori4, S. Kaneko4, N. Nishida4, and K. Machida1

  • 1Department of Physics, Okayama University, Okayama 700-8530, Japan
  • 2Department of Physics, University of Montenegro, Podgorica 81000, Montenegro
  • 3NuQuest Research LLC, La Jolla, California 92037-5801, USA
  • 4Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan

  • *Electronic address: nakai@mp.okayama-u.ac.jp

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Issue

Vol. 97, Iss. 14 — 6 October 2006

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