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Title: Nuclear magnetic resonance investigation of superconducting and normal state Nb3Sn

Journal Article · · Superconductor Science and Technology
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [2];  [4]; ORCiD logo [2]
  1. Northwestern Univ., Evanston, IL (United States)
  2. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  3. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
  4. Bruker OST, Carteret, NJ (United States)
+ Show Author Affiliations

The superconductor Nb3Sn has important applications for construction of very high-field superconducting magnets. In this work we investigate its microscopic electronic structure with 93Nb nuclear magnetic resonance (NMR). The high-quality Nb3Sn powder sample was studied in both 3.2 T and 7 T magnetic fields in the temperature range from 4 K to 300 K. From measurement of the spectrum and its theoretical analysis, we find evidence for anisotropy despite its cubic crystal structure. Magnetic alignment of the powder grains in the superconducting state was also observed. The Knight shift and spin-lattice relaxation rate, T1-1, were measured and the latter compared with BCS theory for the energy gap Δ(0) = 2.7 ± 0.3kBTc at 3.2 T and Δ(0) = 2.33 ± 0.07 kBTc at 7 T, indicating suppression of the order parameter by magnetic field.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); National Quantum Information Science (QIS) Research Centers (United States). Superconducting Quantum Materials and Systems Center (SQMS)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359; SC0012083
OSTI ID:
2482543
Report Number(s):
FERMILAB-PUB--24-0907-TD; arXiv:2311.00841; oai:inspirehep.net:2856184
Journal Information:
Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 8 Vol. 37; ISSN 0953-2048
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (7)

Surface structure and multigap superconductivity of V3Si (111) revealed by scanning tunneling microscopy journal April 2023
Spatially resolved electronic structure inside and outside the vortex cores of a high-temperature superconductor journal October 2001
Challenges and status of ITER conductor production journal March 2014
Advances in Nb 3 Sn superconducting radiofrequency cavities towards first practical accelerator applications journal January 2021
Critical fields, Pauli paramagnetic limiting, and material parameters of Nb 3 Sn and V 3 Si journal May 1979
Heat-capacity analysis of a large number of A 15 -type compounds journal February 1983
Bare Density of States at the Fermi Level inV3Ga1−xSnx: A Nuclear-Magnetic-Resonance Study journal June 1973

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Nb3Sn
nuclear magnetic resonance
spin lattice relaxation
superconducting energy gap
superconductivity