Hidden crossover phenomena in strongly Pauli-limited multiband superconductors: Application to CeCu2Si2

Yasumasa Tsutsumi; Kazushige Machida; Masanori Ichioka

doi:10.1103/PhysRevB.92.020502

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Hidden crossover phenomena in strongly Pauli-limited multiband superconductors: Application to CeCu2Si2

Yasumasa Tsutsumi, Kazushige Machida, Masanori Ichioka

DOI 10.1103/PhysRevB.92.020502 · Physical Review B

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Abstract

Motivated by recent experiments on heavy fermion materials CeCu2Si2 and UBe13, we develop a framework to capture generic properties of multiband superconductors with strong Pauli paramagnetic effect (PPE). In contrast to the single band case, the upper critical field Hc2 can remain a second-order transition even for strong PPE cases. The expected first-order transition is hidden inside Hc2 and becomes a crossover due to the interplay of multibandness. The present theory based on full self-consistent solutions of the microscopic Eilenberger theory explains several mysterious anomalies associated with the crossover and the “empty” vortex core state which is observed by recent STM experiment on CeCu2Si2.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown