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Extreme high-field superconductivity in thin Re films

Journal Article · · Physical Review B
 [1];  [2];  [2];  [3];  [4];  [4];  [2]
  1. Louisiana State Univ., Baton Rouge, LA (United States); LSU (Baton Rouge)
  2. Louisiana State Univ., Baton Rouge, LA (United States)
  3. Forschungszentrum Jülich (Germany)
  4. Univ. of Texas, Arlington, TX (United States)
We report the high-field superconducting properties of thin, disordered Re films via magnetotransport and tunneling density of states measurements. Films with thicknesses in the range of 9 to 3 nm had normal-state sheet resistances of ~0.2 kΩ to ~1 kΩ and corresponding transition temperatures in the range of 6 to 3 K. Tunneling spectra were consistent with those of a moderate coupling BCS superconductor. Notwithstanding these unremarkable superconducting properties, the films exhibited an extraordinarily high upper critical field. Here, we estimate their zero temperature Hc2 to be more than twice the Pauli limit. Indeed, in 6-nm samples the estimated reduced critical field Hc2/Tc ~ 5.6T/K is among the highest reported for any elemental superconductor. Although the sheet resistances of the films were well below the quantum resistance RQ = h/4e2, their Hc2's approached the theoretical upper limit of a strongly disordered superconductor for which kFℓ ~ 1.
Research Organization:
Louisiana State Univ., Baton Rouge, LA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-07ER46420
OSTI ID:
1833368
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 103; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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