Magnetic and superconducting properties of vanadium nanoconstrictions

Hiroki Takata, Yuji Inagaki, Tatsuya Kawae, Koichiro Ienaga, Hiroyuki Tsujii

Research output: Contribution to journalConference article

Abstract

We study the magnetic and superconducting properties in a paramagnetic vanadium (V) nanoconstriction with changing its size using a mechanically controllable break junction technique. In the normal state the magnetoresistance effect is observed below the diameter d ∼ 8 nm. Moreover, a Fano resonance appears around zero-bias voltage in the differential conductance for the atomic-size contacts and changes shape as the size of the constriction changes. On the other hand, below the superconducting critical temperature the superconducting gap features in V contacts are largely different from those in Pb contacts which exhibit typical features expected in superconducting point contacts. Only a single Andreev anomaly at 2Δ, where Δ is the superconducting energy gap, is observed in the spectra of the V contacts, while two anomalies at Δ and 2Δ appear in the case of the Pb contacts. In the tunnel conductance regime, the structure of the superconducting quasiparticle tunneling density of states is not seen in the V spectra in contrast to the Pb spectra. The origin of these features is discussed.

Original languageEnglish
Article number012137
JournalJournal of Physics: Conference Series
Volume592
Issue number1
DOIs
Publication statusPublished - Jan 1 2014
Event2014 International Conference on Strongly Correlated Electron Systems, SCES 2014 - Grenoble, France
Duration: Jul 7 2014Jul 14 2014

Fingerprint

vanadium
magnetic properties
anomalies
tunnels
constrictions
critical temperature
electric potential

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Magnetic and superconducting properties of vanadium nanoconstrictions. / Takata, Hiroki; Inagaki, Yuji; Kawae, Tatsuya; Ienaga, Koichiro; Tsujii, Hiroyuki.

In: Journal of Physics: Conference Series, Vol. 592, No. 1, 012137, 01.01.2014.

Research output: Contribution to journalConference article

@article{ddb54bd90c814f8d8ae3a27cce24813d,
title = "Magnetic and superconducting properties of vanadium nanoconstrictions",
abstract = "We study the magnetic and superconducting properties in a paramagnetic vanadium (V) nanoconstriction with changing its size using a mechanically controllable break junction technique. In the normal state the magnetoresistance effect is observed below the diameter d ∼ 8 nm. Moreover, a Fano resonance appears around zero-bias voltage in the differential conductance for the atomic-size contacts and changes shape as the size of the constriction changes. On the other hand, below the superconducting critical temperature the superconducting gap features in V contacts are largely different from those in Pb contacts which exhibit typical features expected in superconducting point contacts. Only a single Andreev anomaly at 2Δ, where Δ is the superconducting energy gap, is observed in the spectra of the V contacts, while two anomalies at Δ and 2Δ appear in the case of the Pb contacts. In the tunnel conductance regime, the structure of the superconducting quasiparticle tunneling density of states is not seen in the V spectra in contrast to the Pb spectra. The origin of these features is discussed.",
author = "Hiroki Takata and Yuji Inagaki and Tatsuya Kawae and Koichiro Ienaga and Hiroyuki Tsujii",
year = "2014",
month = "1",
day = "1",
doi = "10.1088/1742-6596/592/1/012137",
language = "English",
volume = "592",
journal = "Journal of Physics: Conference Series",
issn = "1742-6588",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Magnetic and superconducting properties of vanadium nanoconstrictions

AU - Takata, Hiroki

AU - Inagaki, Yuji

AU - Kawae, Tatsuya

AU - Ienaga, Koichiro

AU - Tsujii, Hiroyuki

PY - 2014/1/1

Y1 - 2014/1/1

N2 - We study the magnetic and superconducting properties in a paramagnetic vanadium (V) nanoconstriction with changing its size using a mechanically controllable break junction technique. In the normal state the magnetoresistance effect is observed below the diameter d ∼ 8 nm. Moreover, a Fano resonance appears around zero-bias voltage in the differential conductance for the atomic-size contacts and changes shape as the size of the constriction changes. On the other hand, below the superconducting critical temperature the superconducting gap features in V contacts are largely different from those in Pb contacts which exhibit typical features expected in superconducting point contacts. Only a single Andreev anomaly at 2Δ, where Δ is the superconducting energy gap, is observed in the spectra of the V contacts, while two anomalies at Δ and 2Δ appear in the case of the Pb contacts. In the tunnel conductance regime, the structure of the superconducting quasiparticle tunneling density of states is not seen in the V spectra in contrast to the Pb spectra. The origin of these features is discussed.

AB - We study the magnetic and superconducting properties in a paramagnetic vanadium (V) nanoconstriction with changing its size using a mechanically controllable break junction technique. In the normal state the magnetoresistance effect is observed below the diameter d ∼ 8 nm. Moreover, a Fano resonance appears around zero-bias voltage in the differential conductance for the atomic-size contacts and changes shape as the size of the constriction changes. On the other hand, below the superconducting critical temperature the superconducting gap features in V contacts are largely different from those in Pb contacts which exhibit typical features expected in superconducting point contacts. Only a single Andreev anomaly at 2Δ, where Δ is the superconducting energy gap, is observed in the spectra of the V contacts, while two anomalies at Δ and 2Δ appear in the case of the Pb contacts. In the tunnel conductance regime, the structure of the superconducting quasiparticle tunneling density of states is not seen in the V spectra in contrast to the Pb spectra. The origin of these features is discussed.

UR - http://www.scopus.com/inward/record.url?scp=84925339357&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84925339357&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/592/1/012137

DO - 10.1088/1742-6596/592/1/012137

M3 - Conference article

AN - SCOPUS:84925339357

VL - 592

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

IS - 1

M1 - 012137

ER -