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

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	659-660
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	284-288
Issue number	PART I
DOIs	https://doi.org/10.1016/S0921-4526(99)02325-X
State	Published - 2000

Bibliographical note

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

Keywords

Bi-2212
Pseudogap
STM/STS
Strongly correlated systems
Tunneling

ASJC Scopus subject areas

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

Access to Document

10.1016/S0921-4526(99)02325-X

Cite this

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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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T1 - Temperature and magnetic field-dependent tunneling study of Bi2Sr2CaCu2Oy in the pseudogap state

AU - Ng, K. W.

AU - Gupta, Anjan K.

N1 - Funding Information: This work was supported by NSF Grant No. DMR-9623842.

PY - 2000

Y1 - 2000

N2 - 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.

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.

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KW - STM/STS

KW - Strongly correlated systems

KW - Tunneling

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