Determination of gap symmetry from angle-dependent Hc2 measurements on CeCu2Si2

H. A. Vieyra; N. Oeschler; S. Seiro; H. S. Jeevan; C. Geibel; D. Parker; F. Steglich

doi:10.1103/PhysRevLett.106.207001

Determination of gap symmetry from angle-dependent H_c2 measurements on CeCu₂Si₂

H. A. Vieyra, N. Oeschler, S. Seiro, H. S. Jeevan, C. Geibel, D. Parker, F. Steglich

Materials Theory

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37 Scopus citations

Abstract

The tetragonal heavy-fermion compound CeCu₂Si₂ exhibits a superconducting ground state (S type, T_c=0.67K) close to a magnetic instability. Here, we present angle-resolved resistivity measurements of the upper critical field H_c2. In-plane rotation of S-type CeCu₂Si₂ single crystals reveals a fourfold oscillation of H_c2. An extended weak-coupling BCS model for a d-wave symmetry including strong Pauli-limiting effects confirms the aforementioned angular dependence and points towards d_xy symmetry of the order parameter.

Original language	English
Article number	207001
Journal	Physical Review Letters
Volume	106
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.106.207001
State	Published - May 20 2011

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10.1103/PhysRevLett.106.207001

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abstract = "The tetragonal heavy-fermion compound CeCu2Si2 exhibits a superconducting ground state (S type, Tc=0.67K) close to a magnetic instability. Here, we present angle-resolved resistivity measurements of the upper critical field Hc2. In-plane rotation of S-type CeCu2Si2 single crystals reveals a fourfold oscillation of Hc2. An extended weak-coupling BCS model for a d-wave symmetry including strong Pauli-limiting effects confirms the aforementioned angular dependence and points towards dxy symmetry of the order parameter.",

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AU - Vieyra, H. A.

AU - Oeschler, N.

AU - Seiro, S.

AU - Jeevan, H. S.

AU - Geibel, C.

AU - Parker, D.

AU - Steglich, F.

PY - 2011/5/20

Y1 - 2011/5/20

N2 - The tetragonal heavy-fermion compound CeCu2Si2 exhibits a superconducting ground state (S type, Tc=0.67K) close to a magnetic instability. Here, we present angle-resolved resistivity measurements of the upper critical field Hc2. In-plane rotation of S-type CeCu2Si2 single crystals reveals a fourfold oscillation of Hc2. An extended weak-coupling BCS model for a d-wave symmetry including strong Pauli-limiting effects confirms the aforementioned angular dependence and points towards dxy symmetry of the order parameter.

AB - The tetragonal heavy-fermion compound CeCu2Si2 exhibits a superconducting ground state (S type, Tc=0.67K) close to a magnetic instability. Here, we present angle-resolved resistivity measurements of the upper critical field Hc2. In-plane rotation of S-type CeCu2Si2 single crystals reveals a fourfold oscillation of Hc2. An extended weak-coupling BCS model for a d-wave symmetry including strong Pauli-limiting effects confirms the aforementioned angular dependence and points towards dxy symmetry of the order parameter.

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VL - 106

JO - Physical Review Letters

JF - Physical Review Letters

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ER -

Determination of gap symmetry from angle-dependent H_c2 measurements on CeCu₂Si₂

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