Magnetization of underdoped YBa2Cu3Oy above the irreversibility field

Znanstveni rad - Izvorni znanstveni rad

• Autor: Jing Fei Yu
• Autor: B. J. Ramshaw
• Autor: Ivan Kokanović
• Autor: K. A. Modic
• Autor: N. Harrison
• Autor: James Day
• Autor: Ruixing Liang
• Autor: W. N. Hardy
• Autor: D. A. Bonn
• Autor: A. McCollam
• Autor: S. R. Julian
• Autor: J. R. Cooper
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

Torque magnetization measurements on YBa2Cu3Oy (YBCO) at doping y = 6.67 (p = 0.12), in dc fields (B) up to 33 T and temperatures down to 4.5 K, show that weak diamagnetism persists above the extrapolated irreversibility field Hirr(T = 0) ≈ 24 T. The differential susceptibility dM/dB, however, is more rapidly suppressed for B 16 T than expected from the properties of the low field superconducting state, and saturates at a low value for fields B 24 T. In addition, torque measurements on a p = 0.11 YBCO crystal in pulsed field up to 65 T and temperatures down to 8 K show similar behavior, with no additional features at higher fields. We offer two candidate scenarios to explain these observations: (a) superconductivity survives but is heavily suppressed at high field by competition with charge-density-wave (CDW) order; (b) static superconductivity disappears near 24 T and is followed by a region of fluctuating superconductivity, which causes dM/dB to saturate at high field. The diamagnetic signal observed above 50 T for the p = 0.11 crystal at 40 K and below may be caused by changes in the normal state susceptibility rather than bulk or fluctuating superconductivity. There will be orbital (Landau) diamagnetism from electron pockets and possibly a reduction in spin susceptibility caused by the stronger three-dimensional ordered CDW.

• Ključne riječi (engleski): superconductivity; superconducting fluctuations; charge-density-wave
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical review B: Condensed matter and materials physics
• Brojčani podaci: vol. 92, br. 18, 180509(R)
• p-ISSN: 1098-0121
• e-ISSN: 1550-235X
• DOI: https://doi.org/10.1103/PhysRevB.92.180509
• URN:NBN: urn:nbn:hr:217:010213
• Datum objave publikacije: 2015
• Projekt: Šifra: IP-2013-11-6216; Naziv (hrvatski): Transporna, magnetska i termodinamička svojstva odabranih anorganskih i organskih materijala; Kratica: TRANMAGTHERPROMAT; Voditelj: Ivan Kokanović; Pravna nadležnost: Hrvatska; Financijer: HRZZ; Linija financiranja: IP
• URL dokumenta: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.180509
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: Copyright (2015) by the American Physical Society. Received 18 September 2015; revised manuscript received 1 November 2015; published 23 November 2015.
• Datum i vrijeme pohrane: 2020-01-23 16:20:26