Comparison of response of superconductivity to impurity concentration in UBe13 and LuBe13
Abstract
Uhlirova et al. reported superconductivity in LuBe13 and assigned it tentatively to be BCS-type, with specific heat measurements down to 0.45 K showing the partial onset of a bulk transition. In order to check LuBe13 for unconventional behavior, as well as to further characterize the unconventional superconductivity in UBe13, we have prepared and characterized down to 0.40 K three arc-melted samples each of MBe13, M = Lu, U, using three different purities (99.999%, 99.96%, and 99.8%) of Be but with the same high purity M (Lu or U) for all three. The measurements down to 0.40 K allow the detection of the maximum in the specific heat in all three LuBe13 samples. The resulting superconducting properties strongly depend on impurity level in UBe13 (40% decrease in ΔC/Tc, 15% decrease in Tcmid) while the three LuBe13 samples exhibit significantly smaller changes (10% and 5% respectively) with purity. The comparison of properties at the first two levels of purity (99.999% vs 99.96%) is even more disparate: 12% decrease in Tcmid in UBe13 vs no change in LuBe13. Furthermore, these results are consistent with previous results that argue for unconventional superconductivity in UBe13 and are consistent with Uhlirova et al.‘s assignment of LuBe13more »
- Authors:
-
- University of Florida, Gainesville, FL (United States)
- Publication Date:
- Research Org.:
- Univ. of Florida, Gainesville, FL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1977547
- Alternate Identifier(s):
- OSTI ID: 1856050
- Grant/Contract Number:
- SC0020385; DE–SC–0020385
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physica. B, Condensed Matter
- Additional Journal Information:
- Journal Volume: 635; Journal Issue: C; Journal ID: ISSN 0921-4526
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Physics; Superconductivity; Unconventional; Heavy Fermion; Impurity
Citation Formats
Kim, J. S., and Stewart, G. R. Comparison of response of superconductivity to impurity concentration in UBe13 and LuBe13. United States: N. p., 2022.
Web. doi:10.1016/j.physb.2022.413792.
Kim, J. S., & Stewart, G. R. Comparison of response of superconductivity to impurity concentration in UBe13 and LuBe13. United States. https://doi.org/10.1016/j.physb.2022.413792
Kim, J. S., and Stewart, G. R. Thu .
"Comparison of response of superconductivity to impurity concentration in UBe13 and LuBe13". United States. https://doi.org/10.1016/j.physb.2022.413792. https://www.osti.gov/servlets/purl/1977547.
@article{osti_1977547,
title = {Comparison of response of superconductivity to impurity concentration in UBe13 and LuBe13},
author = {Kim, J. S. and Stewart, G. R.},
abstractNote = {Uhlirova et al. reported superconductivity in LuBe13 and assigned it tentatively to be BCS-type, with specific heat measurements down to 0.45 K showing the partial onset of a bulk transition. In order to check LuBe13 for unconventional behavior, as well as to further characterize the unconventional superconductivity in UBe13, we have prepared and characterized down to 0.40 K three arc-melted samples each of MBe13, M = Lu, U, using three different purities (99.999%, 99.96%, and 99.8%) of Be but with the same high purity M (Lu or U) for all three. The measurements down to 0.40 K allow the detection of the maximum in the specific heat in all three LuBe13 samples. The resulting superconducting properties strongly depend on impurity level in UBe13 (40% decrease in ΔC/Tc, 15% decrease in Tcmid) while the three LuBe13 samples exhibit significantly smaller changes (10% and 5% respectively) with purity. The comparison of properties at the first two levels of purity (99.999% vs 99.96%) is even more disparate: 12% decrease in Tcmid in UBe13 vs no change in LuBe13. Furthermore, these results are consistent with previous results that argue for unconventional superconductivity in UBe13 and are consistent with Uhlirova et al.‘s assignment of LuBe13 as a conventional, BCS superconductor. More generally, this example of comparing superconducting properties vs-controlled gradations in impurity levels with two compositionally and structurally “matched” superconducting compounds (one conventional and one of to-be-determined coupling behavior) offers a new method for determining unconventional behavior.},
doi = {10.1016/j.physb.2022.413792},
journal = {Physica. B, Condensed Matter},
number = C,
volume = 635,
place = {United States},
year = {2022},
month = {3}
}
Works referenced in this record:
U : An Unconventional Actinide Superconductor
journal, May 1983
- Ott, H. R.; Rudigier, H.; Fisk, Z.
- Physical Review Letters, Vol. 50, Issue 20
Low-temperature specific heat of
journal, January 1994
- Jin, D. S.; Rosenbaum, T. F.; Kim, J. S.
- Physical Review B, Vol. 49, Issue 2
Superconductivity in single crystalline ThBe13 and LuBe13
journal, May 2018
- Uhlířová, Klára; Miura, Naoyuki; Tkáč, Vladimír
- Physica B: Condensed Matter, Vol. 536
Spin-Triplet -Wave Superconductivity Revealed under High Pressure in
journal, February 2019
- Shimizu, Yusei; Braithwaite, Daniel; Aoki, Dai
- Physical Review Letters, Vol. 122, Issue 6
Observation of Low-Energy Einstein Phonon and Superconductivity in Single-Crystalline LaBe 13
journal, February 2017
- Hidaka, Hiroyuki; Shimizu, Yusei; Yamazaki, Seigo
- Journal of the Physical Society of Japan, Vol. 86, Issue 2
Observation of Negative -Wave Proximity Effect in Superconducting U
journal, July 1986
- Han, Siyuan; Ng, K. W.; Wolf, E. L.
- Physical Review Letters, Vol. 57, Issue 2
Signature of superconductivity in as seen by neutron scattering: Superconducting and magnetic energy scales
journal, June 2014
- Hiess, A.; Schneidewind, A.; Stockert, O.
- Physical Review B, Vol. 89, Issue 23
Tracking aluminium impurities in single crystals of the heavy-fermion superconductor UBe13
journal, July 2018
- Amon, Alfred; Zelenina, Iryna; Simon, Paul
- Scientific Reports, Vol. 8, Issue 1
Unconventional superconductivity
journal, April 2017
- Stewart, G. R.
- Advances in Physics, Vol. 66, Issue 2
s-f hybridization model of
journal, January 1985
- Overhauser, A. W.; Appel, J.
- Physical Review B, Vol. 31, Issue 1
Heavy-fermion systems
journal, October 1984
- Stewart, G. R.
- Reviews of Modern Physics, Vol. 56, Issue 4
Structural differences between single crystal and polycrystalline UBe 13
journal, May 2018
- Volz, H. M.; Vogel, S. C.; Smith, A. I.
- Philosophical Magazine, Vol. 98, Issue 22