Superconductivity induced by spark erosion in ZrZn2
arXiv:cond-mat/0502341 · doi:10.1103/PhysRevB.72.214523
Abstract
We show that the superconductivity observed recently in the weak itinerant ferromagnet ZrZn2 [C. Pfleiderer et al., Nature (London) 412, 58 (2001)] is due to remnants of a superconducting layer induced by spark erosion. Results of resistivity, susceptibility, specific heat and surface analysis measurements on high-quality ZrZn2 crystals show that cutting by spark erosion leaves a superconducting surface layer. The resistive superconducting transition is destroyed by chemically etching a layer of 5 microns from the sample. No signature of superconductivity is observed in rho(T) of etched samples at the lowest current density measured, J=675 Am-2, and at T < 45 mK. EDX analysis shows that spark-eroded surfaces are strongly Zn depleted. The simplest explanation of our results is that the superconductivity results from an alloy with higher Zr content than ZrZn2.
arXiv commentFinal published version
References in corpus (2)
Cited by in corpus (19)
- Fermi-liquid instabilities at magnetic quantum phase transitions
- Metallic Quantum Ferromagnets
- Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
- Ferromagnetism and Superconductivity in Uranium Compounds
- Non-Fermi-liquid behavior in nearly ferromagnetic metallic SrIrO3 single crystals
- Heavy fermions in high magnetic field
- Critical Phenomena and the Quantum Critical Point of Ferromagnetic Zr1-xNbxZn2
- Surface-induced Magnetism Fluctuations in Single Crystal of NiBi3 Superconductor
- Spin Order in Paired Quantum Hall States
- Crystal growth and annealing study of fragile, non-bulk superconductivity in YFeGe
- Fermi Velocity Spectrum and Incipient Magnetism in TiBe2
- Transport and Thermodynamic Evidence for a Marginal Fermi Liquid State in ZrZn
- Derivation of the Ginzburg-Landau equations of a ferromagnetic p-wave superconductor
- Thermodynamics of ferromagnetic superconductors with spin-triplet electron pairing
- Josephson effect in thin-film superconductor/insulator/superconductor junctions with misaligned in-plane magnetic fields
- Critical Scaling of the Magnetization and Magnetostriction in the Weak Itinerant Ferromagnet UIr
- Field-dependent AC susceptibility of itinerant ferromagnets
- On the phase diagrams of the ferromagnetic superconductors ZrZn2 and UGe2
- Why band theorists have been so successful in explaining and predicting novel superconductors?