Superconducting gap and vortex lattice of the heavy-fermion compound CeCu2Si2

Mostafa Enayat; Zhixiang Sun; Ana Maldonado; Hermann Suderow; Silvia Seiro; Christoph Geibel; Steffen Wirth; Frank Steglich; Peter Wahl

doi:10.1103/PhysRevB.93.045123

Superconducting gap and vortex lattice of the heavy-fermion compound CeCu₂Si₂

Mostafa Enayat, Zhixiang Sun, Ana Maldonado, Hermann Suderow, Silvia Seiro, Christoph Geibel, Steffen Wirth, Frank Steglich, Peter Wahl

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

Abstract

The order parameter and pairing mechanism for superconductivity in heavy-fermion compounds are still poorly understood. Scanning tunneling microscopy and spectroscopy at ultralow temperatures can yield important information about the superconducting order parameter and the gap structure. Here, we study the first heavy-fermion superconductor, CeCu₂Si₂. Our data show the superconducting gap which is not fully formed and exhibits features that point to a multigap order parameter. Spatial mapping of the zero-bias conductance in magnetic field reveals the vortex lattice, which allows us to unequivocally link the observed conductance gap to superconductivity in CeCu₂Si₂. The vortex lattice is found to be predominantly triangular with distortions at fields close to ∼0.7H_c2.

Original language	English
Article number	045123
Journal	Physical Review. B, Condensed matter and materials physics
Volume	93
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevB.93.045123
Publication status	Published - 20 Jan 2016

Access to Document

10.1103/PhysRevB.93.045123

Wahl_2016_PRB_Superconducting_FinalPublishedVersion
© 2016 American Physical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://dx.doi.org/10.1103/PhysRevB.93.045123
Final published version, 811 KB

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems
Wahl, P. (PI), Baumberger, F. (CoI), Davis, J. C. (CoI), Green, A. (CoI), Hooley, C. (CoI), Keeling, J. M. J. (CoI) & Mackenzie, A. (CoI)
EPSRC
1/09/11 → 31/08/17
Project: Standard

Data underpinning - Superconducting gap and vortex lattice of the heavy fermion compound CeCu2Si2
Enayat, M. (Creator), Sun, Z. (Creator), Maldonado Cid, A. I. (Creator), Suderow, H. (Creator), Seiro, S. (Creator), Geibel, C. (Creator), Wirth, S. (Creator), Steglich, F. (Creator) & Wahl, P. (Creator), University of St Andrews, 2016
DOI: 10.17630/EC932263-A789-435C-BBE7-8A6960CA7358
Dataset

File

Cite this

@article{fec3d0934e5e45048be2dd706a04634e,

title = "Superconducting gap and vortex lattice of the heavy-fermion compound CeCu2Si2",

abstract = "The order parameter and pairing mechanism for superconductivity in heavy-fermion compounds are still poorly understood. Scanning tunneling microscopy and spectroscopy at ultralow temperatures can yield important information about the superconducting order parameter and the gap structure. Here, we study the first heavy-fermion superconductor, CeCu2Si2. Our data show the superconducting gap which is not fully formed and exhibits features that point to a multigap order parameter. Spatial mapping of the zero-bias conductance in magnetic field reveals the vortex lattice, which allows us to unequivocally link the observed conductance gap to superconductivity in CeCu2Si2. The vortex lattice is found to be predominantly triangular with distortions at fields close to ∼0.7Hc2.",

author = "Mostafa Enayat and Zhixiang Sun and Ana Maldonado and Hermann Suderow and Silvia Seiro and Christoph Geibel and Steffen Wirth and Frank Steglich and Peter Wahl",

note = "ZS acknowledges support from NWO (grant no. 680.50.1119)",

year = "2016",

month = jan,

day = "20",

doi = "10.1103/PhysRevB.93.045123",

language = "English",

volume = "93",

journal = "Physical Review. B, Condensed matter and materials physics",

issn = "1098-0121",

publisher = "American Physical Society",

number = "4",

}

TY - JOUR

T1 - Superconducting gap and vortex lattice of the heavy-fermion compound CeCu2Si2

AU - Enayat, Mostafa

AU - Sun, Zhixiang

AU - Maldonado, Ana

AU - Suderow, Hermann

AU - Seiro, Silvia

AU - Geibel, Christoph

AU - Wirth, Steffen

AU - Steglich, Frank

AU - Wahl, Peter

N1 - ZS acknowledges support from NWO (grant no. 680.50.1119)

PY - 2016/1/20

Y1 - 2016/1/20

N2 - The order parameter and pairing mechanism for superconductivity in heavy-fermion compounds are still poorly understood. Scanning tunneling microscopy and spectroscopy at ultralow temperatures can yield important information about the superconducting order parameter and the gap structure. Here, we study the first heavy-fermion superconductor, CeCu2Si2. Our data show the superconducting gap which is not fully formed and exhibits features that point to a multigap order parameter. Spatial mapping of the zero-bias conductance in magnetic field reveals the vortex lattice, which allows us to unequivocally link the observed conductance gap to superconductivity in CeCu2Si2. The vortex lattice is found to be predominantly triangular with distortions at fields close to ∼0.7Hc2.

AB - The order parameter and pairing mechanism for superconductivity in heavy-fermion compounds are still poorly understood. Scanning tunneling microscopy and spectroscopy at ultralow temperatures can yield important information about the superconducting order parameter and the gap structure. Here, we study the first heavy-fermion superconductor, CeCu2Si2. Our data show the superconducting gap which is not fully formed and exhibits features that point to a multigap order parameter. Spatial mapping of the zero-bias conductance in magnetic field reveals the vortex lattice, which allows us to unequivocally link the observed conductance gap to superconductivity in CeCu2Si2. The vortex lattice is found to be predominantly triangular with distortions at fields close to ∼0.7Hc2.

U2 - 10.1103/PhysRevB.93.045123

DO - 10.1103/PhysRevB.93.045123

M3 - Article

SN - 1098-0121

VL - 93

JO - Physical Review. B, Condensed matter and materials physics

JF - Physical Review. B, Condensed matter and materials physics

IS - 4

M1 - 045123

ER -

Superconducting gap and vortex lattice of the heavy-fermion compound CeCu2Si2

Abstract

Access to Document

Fingerprint

Projects

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

Datasets

Data underpinning - Superconducting gap and vortex lattice of the heavy fermion compound CeCu2Si2

Cite this

Superconducting gap and vortex lattice of the heavy-fermion compound CeCu₂Si₂