Unconventional quantum oscillations in mesoscopic rings of spin-triplet superconductor Sr2RuO4

X. Cai, Y. A. Ying, N. E. Staley, Y. Xin, D. Fobes, T. J. Liu, Z. Q. Mao, Y. Liu

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The odd-parity, spin-triplet superconductor Sr2RuO4 has been found to feature exotic vortex physics including half-flux quanta trapped in a doubly connected sample and the formation of vortex lattices at low fields. The consequences of these vortex states on the low-temperature magnetoresistive behavior of mesoscopic samples of Sr2RuO4 were investigated by using a ring device fabricated on mechanically exfoliated single crystals of Sr2RuO4 by photolithography and a focused ion beam. With the magnetic field applied perpendicular to the in-plane direction, thin-wall rings of Sr2RuO4 were found to exhibit pronounced quantum oscillations with a conventional period of the full-flux quantum even though the unexpectedly large amplitude and the number of oscillations suggest the observation of vortex-flow-dominated magnetoresistance oscillations rather than a conventional Little-Parks effect. For rings with a thick wall, two distinct periods of quantum oscillations were found in high- and low-field regimes, respectively, which we argue to be associated with the "lock-in" of a vortex lattice in these thick-wall rings. No evidence for half-flux-quantum resistance oscillations were identified in any sample measured so far without the presence of an in-plane field.

Original languageEnglish (US)
Article number081104
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number8
DOIs
StatePublished - Feb 14 2013

Fingerprint

Superconducting materials
Vortex flow
vortices
oscillations
rings
thick walls
Fluxes
thin walls
Focused ion beams
Photolithography
Magnetoresistance
photolithography
parity
Physics
ion beams
Single crystals
Magnetic fields
physics
single crystals
magnetic fields

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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abstract = "The odd-parity, spin-triplet superconductor Sr2RuO4 has been found to feature exotic vortex physics including half-flux quanta trapped in a doubly connected sample and the formation of vortex lattices at low fields. The consequences of these vortex states on the low-temperature magnetoresistive behavior of mesoscopic samples of Sr2RuO4 were investigated by using a ring device fabricated on mechanically exfoliated single crystals of Sr2RuO4 by photolithography and a focused ion beam. With the magnetic field applied perpendicular to the in-plane direction, thin-wall rings of Sr2RuO4 were found to exhibit pronounced quantum oscillations with a conventional period of the full-flux quantum even though the unexpectedly large amplitude and the number of oscillations suggest the observation of vortex-flow-dominated magnetoresistance oscillations rather than a conventional Little-Parks effect. For rings with a thick wall, two distinct periods of quantum oscillations were found in high- and low-field regimes, respectively, which we argue to be associated with the {"}lock-in{"} of a vortex lattice in these thick-wall rings. No evidence for half-flux-quantum resistance oscillations were identified in any sample measured so far without the presence of an in-plane field.",
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Unconventional quantum oscillations in mesoscopic rings of spin-triplet superconductor Sr2RuO4. / Cai, X.; Ying, Y. A.; Staley, N. E.; Xin, Y.; Fobes, D.; Liu, T. J.; Mao, Z. Q.; Liu, Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 87, No. 8, 081104, 14.02.2013.

Research output: Contribution to journalArticle

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AU - Ying, Y. A.

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AU - Xin, Y.

AU - Fobes, D.

AU - Liu, T. J.

AU - Mao, Z. Q.

AU - Liu, Y.

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