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Electron spin relaxation and K39 pulsed ENDOR studies on Cr5+-doped K3NbO8 at 9.7 and 240 GHz
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Nellutla, S., Morley, Gavin, Tol, J. (Johan) van, Pati, M. and Dalal, Naresh S. (2008) Electron spin relaxation and K39 pulsed ENDOR studies on Cr5+-doped K3NbO8 at 9.7 and 240 GHz. Physical Review B (Condensed Matter and Materials Physics), Vol.78 (No.5). 054426-1. doi:10.1103/PhysRevB.78.054426 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.78.054426
Abstract
Cr5+-doped K3NbO8, considered to be useful as an electron spin qubit, has been investigated by pulsed X band (∼9.7 GHz) and 240 GHz electron paramagnetic resonance and electron nuclear double resonance (ENDOR). Comparison of the low temperature electronic spin-lattice relaxation rate 1/T1 at 9.7 and 240 GHz shows that it is 250 times faster at 240 GHz than at X band. On the other hand, spin-spin relaxation rate 1/T2 appears largely frequency independent and is very likely related to the superhyperfine (SHF) coupling of the Cr5+ electron with the surrounding potassium and niobium nuclei. This coupling was investigated by hyperfine sublevel correlation spectroscopy at 9.7 GHz and pulsed Mims ENDOR at 240 GHz. The use of high frequency and field enabled us to unambiguously measure the hyperfine and quadrupole couplings of the 39K in spite of its small magnetic moment. We find that the largest 39K SHF coupling is positive, with 0.522 and 0.20 MHz as its isotropic and dipolar parts, respectively. 93Nb ENDOR was dominantly due to its quadrupolar interaction with a coupling of about 0.8 MHz and a SHF coupling of about 0.08 MHz. The significance of these data to spin qubit studies is pointed out.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Electron paramagnetic resonance, Electron nuclear double resonance | ||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1098-0121 | ||||
| Official Date: | 19 August 2008 | ||||
| Dates: |
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| Volume: | Vol.78 | ||||
| Number: | No.5 | ||||
| Number of Pages: | 6 | ||||
| Page Range: | 054426-1 | ||||
| DOI: | 10.1103/PhysRevB.78.054426 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | National Science Foundation (U.S.) (NSF), Florida | ||||
| Grant number: | DMR0654118 (NSF), DMR0506946 (NSF) |
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