Manipulating the nematic director by magnetic fields in the spin-triplet superconducting state of CuxBi2Se3
arXiv:2303.09108 · doi:10.1103/PhysRevB.107.L100505
Abstract
Electronic nematicity, a consequence of rotational symmetry breaking, is an emergent phenomenon in various new materials. In order to fully utilize the functions of these materials, ability of tuning them through a knob, the nematic director, is desired. Here we report a successful manipulation of the nematic director, the vector order-parameter (d-vector), in the spin-triplet superconducting state of CuxBi2Se3 by magnetic fields. At H = 0.5 T, the ac susceptibility related to the upper critical field shows a two-fold symmetry in the basal plane. At H = 1.5 T, however, the susceptibility shows a six-fold symmetry, which has never been reported before in any superconductor. These results indicate that the d-vector initially pinned to a certain direction is unlocked by a threshold field to respect the trigonal crystal symmetry. We further reveal that the superconducting gap in different crystals converges to p_x symmetry at high fields, although it differs at low fields.
arXiv commentErrors in figures corrected. Published version
References in corpus (24)
- Topological insulators and superconductors
- Fault-tolerant quantum computation by anyons
- Spontaneous Skyrmion Ground States in Magnetic Metals
- Non-abelian statistics of half-quantum vortices in p-wave superconductors
- Nematic order in iron superconductors - who is in the driver's seat?
- Odd-Parity Topological Superconductors: Theory and Application to CuBiSe
- Spontaneously polarized half-gapped superconductivity
- Nematicity and Competing Orders in Superconducting Magic-Angle Graphene
- Spin-Rotation Symmetry Breaking in the Superconducting State of CuxBi2Se3
- Thermodynamic evidence for nematic superconductivity in CuBiSe
- Odd-parity topological superconductor with nematic order: Application to CuxBi2Se3
- Rotational Symmetry Breaking in a Trigonal superconductor Nb-doped Bi2Se3
- Electrochemical synthesis and superconducting phase diagram of Cu_xBi2Se3
- Odd-parity superconductors with two-component order parameters: nematic and chiral, full gap and Majorana node
- Spin-Triplet Superconductivity in K2Cr3As3
- Direct visualization of the nematic superconductivity in CuBiSe
- Superconductivity with two-fold symmetry in topological superconductor SrxBi2Se3
- Identification of nematic superconductivity from the upper critical field
- Nematic Skyrmions in Odd-Parity Superconductors
- Anomalous suppression of the superfluid density in the CuxBi2Se3 superconductor upon progressive Cu intercalation
- Direction and symmetry transition of the vector order parameter in topological superconductors CuBiSe
- Vortex lattice structure in a d_{x^2-y^2}-wave superconductor
- Phonon-induced rotation of the electronic nematic director in superconducting BiSe
- Upper critical field in a trigonal unconventional superconductor UPt_3