Temperature and magnetic field-dependent tunneling study of Bi2Sr2CaCu2Oy in the pseudogap state

K. W. Ng; Anjan K. Gupta

doi:10.1016/S0921-4526(99)02325-X

Temperature and magnetic field-dependent tunneling study of Bi₂Sr₂CaCu₂O_y in the pseudogap state

K. W. Ng
, Anjan K. Gupta

Producción científica: Article › revisión exhaustiva

2 Citas (Scopus)

Resumen

The existence of Cooper pairs above T_c is a popular theory of pseudogap in cuprates. The influence of magnetic field on such Cooper pairs should be drastic, although magnitude of the field required can be quite large. We have performed tunneling measurements in the ab-plane direction on underdoped Bi₂Sr₂CaCu₂O_y (Bi2212) single crystals with T_c = 65 K for SIS junction formed with a low-temperature STM. The gap value A was found to be 35 meV from low-temperature tunneling spectra. The gap stays at this value up to T_c and it becomes more smeared near T_c, but exists at least up to 150K. The spectra near 100 K were studied as a function of the magnetic field and no change in the gap features was observed up to 1.1 T.

Idioma original	English
Páginas (desde-hasta)	659-660
Número de páginas	2
Publicación	Physica B: Condensed Matter
Volumen	284-288
N.º	PART I
DOI	https://doi.org/10.1016/S0921-4526(99)02325-X
Estado	Published - 2000

Nota bibliográfica

Funding Information:
This work was supported by NSF Grant No. DMR-9623842.

Financiación

This work was supported by NSF Grant No. DMR-9623842.

Financiadores	Número del financiador
National Science Foundation (NSF)	DMR-9623842

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Acceder al documento

10.1016/S0921-4526(99)02325-X

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title = "Temperature and magnetic field-dependent tunneling study of Bi2Sr2CaCu2Oy in the pseudogap state",

abstract = "The existence of Cooper pairs above Tc is a popular theory of pseudogap in cuprates. The influence of magnetic field on such Cooper pairs should be drastic, although magnitude of the field required can be quite large. We have performed tunneling measurements in the ab-plane direction on underdoped Bi2Sr2CaCu2Oy (Bi2212) single crystals with Tc = 65 K for SIS junction formed with a low-temperature STM. The gap value A was found to be 35 meV from low-temperature tunneling spectra. The gap stays at this value up to Tc and it becomes more smeared near Tc, but exists at least up to 150K. The spectra near 100 K were studied as a function of the magnetic field and no change in the gap features was observed up to 1.1 T.",

keywords = "Bi-2212, Pseudogap, STM/STS, Strongly correlated systems, Tunneling",

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AU - Ng, K. W.

AU - Gupta, Anjan K.

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PY - 2000

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AB - The existence of Cooper pairs above Tc is a popular theory of pseudogap in cuprates. The influence of magnetic field on such Cooper pairs should be drastic, although magnitude of the field required can be quite large. We have performed tunneling measurements in the ab-plane direction on underdoped Bi2Sr2CaCu2Oy (Bi2212) single crystals with Tc = 65 K for SIS junction formed with a low-temperature STM. The gap value A was found to be 35 meV from low-temperature tunneling spectra. The gap stays at this value up to Tc and it becomes more smeared near Tc, but exists at least up to 150K. The spectra near 100 K were studied as a function of the magnetic field and no change in the gap features was observed up to 1.1 T.

KW - Bi-2212

KW - Pseudogap

KW - STM/STS

KW - Strongly correlated systems

KW - Tunneling

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