Energy scale in determining Tc of cuprate superconductors

Migaku Oda; Naoki Momono; Masayuki Ido

doi:10.1117/12.397853

6 September 2000 Energy scale in determining T_c of cuprate superconductors

Migaku Oda, Naoki Momono, Masayuki Ido

Proceedings Volume 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV; (2000) https://doi.org/10.1117/12.397853
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

In La_2-xSr_xCuO₄(La214) and Bi₂Sr₂CaCu₂O_8+(delta ) (Bi2212), scanning tunneling spectroscopy (STS), break-junction tunneling spectroscopy (BJTS) and Raman scattering spectroscopy demonstrate that the superconducting-state energy gap (Delta) _o at T << T_c increases monotonically with the lowering of hole-doping level p even below the optimal doping p_o, where T_c begins to decrease. On the basis of electronic specific heat, magnetic susceptibility, resistivity and STS data in La214, it is suggested that a pseudogap of almost the same energy scale as (Delta) _o, a small energy scale pseudogap (SPG), will develop progressively below a certain temperature T* in La214 as in Bi2212. In the two systems, the size of SPG ((Delta) _PG^S), comparable to (Delta) _o, essentially scales with SPG temperature T*; (Delta) _PG^S approximately (Delta) _o approximately (2.3 +/- 0.3)k_BT*. We also report the relation among (Delta) _o, higher crossover temperature T_max (> T*) and the corresponding large energy scale pseudogap (LPG) (Delta) _PG^L; (Delta) _PG^L approximately 3k_BT_max approximately (alpha) (Delta) _o ((alpha) equals 3 to 4 for Bi2212 and (alpha) equals 6 - 8 for La214). Furthermore, we report that T_c almost scales with p(Delta) _o over a wide p range, except for high doping levels (p/p_{o approximately}> 1.3), where T_c is very close to the BCS expectation (T_c equals 2(Delta) _o/4.3k_B). We discuss some scenarios for the superconducting transition, where the energy scale in determining T_c is expected to be of order p(Delta) _o.

Citation Download Citation

Migaku Oda, Naoki Momono, and Masayuki Ido "Energy scale in determining T_c of cuprate superconductors", Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); https://doi.org/10.1117/12.397853

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
12 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Superconductors

Raman spectroscopy

Doping

Magnetism

Spectroscopy

Atrial fibrillation

Crystals

Show All Keywords

Keywords/Phrases

Search In:

Publication Years