Bulk evidence for a time-reversal symmetry broken superconducting state in URu2Si2
G. Li, Q. Zhang, D. Rhodes, B. Zeng, P. Goswami, R. E. Baumbach, P. H. Tobash, F. Ronning, J. D. Thompson, E. D. Bauer, L. Balicas
DOI 10.1103/PhysRevB.88.134517 · Physical Review B
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Abstract
URu2Si2 is claimed to be a chiral d-wave superconductor with a kz(kx±iky) time-reversal symmetry broken orbital component for the Cooper pair wave function, which contains both nodal points and lines of nodes. To study the magnetic response of such an unconventional state through a bulk, thermodynamic probe, we measured the magnetic torque τ in very high-quality, well-characterized URu2Si2 single crystals at high magnetic fields H and at very low temperatures T. The magnetization M(H)∝τ(H)/H of URu2Si2, in its superconducting state and for angles within 15∘ from the ab plane, reveals a change in its sign for H approaching Hc2: from a clear diamagnetic response dominated by the pinning of vortices to a state with a smaller but “paramagneticlike” hysteretic response which disappears at Hc2, thus implying that it is intrinsically related to the superconducting state. We argue that this anomalous, angular-dependent behavior is evidence for a time-reversal symmetry broken superconducting state in URu2Si2, although not necessarily for the kz(kx±iky) state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| URu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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