Magnetic resonance of heavy-fermion superconductors and high-Tc superconductors
Cheng Tien, I. M. Jiang
DOI 10.1103/PhysRevB.40.229 · Physical Review B
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Abstract
Recently there has been a great deal of interest in two classes of superconductors, heavy-fermion superconductors and high-Tc copper oxide superconductors. The behavior and nature of superconductivity in these two classes of materials are reviewed, and their similarities and differences are noted. The temperature dependences of the spin-lattice relaxation time (T1) and the spin-spin relaxation time (T2) of Be9 in UBe13 are quite similar to those of Cu63 and Y89 in YBa2Cu3O7−δ. The Knight shift of UBe13 is unchanged during the superconducting phase transition. The Knight shift of YBa2Cu3O7−δ changes from the value in the normal state Kn/Ks=1 at T≥Tc to Kn/Ks=0.5 and T=6 K. Both do not approach zero as expected in BCS theory. This strongly suggests that the pairing mechanism which induces superconductivity in heavy-fermion materials might also be involved in high-Tc superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| UPt3 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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