TY - JOUR

T1 - Nuclear spin-spin interactions in CdTe probed by zero and ultra-low-field optically detected NMR

AU - Литвяк, Валентина Михайловна

AU - Кавокин, Кирилл Витальевич

AU - Бажин, Павел Сергеевич

AU - Vladimirova, M.

AU - André, R.

PY - 2024/12/15

Y1 - 2024/12/15

N2 - Nuclear magnetic resonance (NMR) is particularly relevant for studies of internuclear spin coupling at zero and ultralow fields (ZULFs), where spin-spin interactions dominate over Zeeman ones. Here, we report on ZULF NMR in CdTe. In this semiconductor all magnetic isotopes have spin I=1/2, so that internuclear interactions are never overshadowed by quadrupole effects. Our experiments rely on warm-up spectroscopy, a technique that combines optical pumping, additional cooling via adiabatic demagnetization, and detection of the oscillating-magnetic-field-induced warm-up of the nuclear spin system via the Hanle effect. We show that NMR spectra exhibit a rich fine structure, consistent with the low abundance of magnetic isotopes in CdTe, their zero quadrupole moments, and direct and indirect interactions between them. A model assuming that the oscillating magnetic field power is absorbed by nuclear spin clusters composed of up to four magnetic isotopes allows us to reproduce the shape of a major part of the measured spectra.

AB - Nuclear magnetic resonance (NMR) is particularly relevant for studies of internuclear spin coupling at zero and ultralow fields (ZULFs), where spin-spin interactions dominate over Zeeman ones. Here, we report on ZULF NMR in CdTe. In this semiconductor all magnetic isotopes have spin I=1/2, so that internuclear interactions are never overshadowed by quadrupole effects. Our experiments rely on warm-up spectroscopy, a technique that combines optical pumping, additional cooling via adiabatic demagnetization, and detection of the oscillating-magnetic-field-induced warm-up of the nuclear spin system via the Hanle effect. We show that NMR spectra exhibit a rich fine structure, consistent with the low abundance of magnetic isotopes in CdTe, their zero quadrupole moments, and direct and indirect interactions between them. A model assuming that the oscillating magnetic field power is absorbed by nuclear spin clusters composed of up to four magnetic isotopes allows us to reproduce the shape of a major part of the measured spectra.

UR - https://www.mendeley.com/catalogue/9a03a4de-30ec-381e-99a4-c907e71c73bd/

U2 - 10.1103/PhysRevB.110.245303

DO - 10.1103/PhysRevB.110.245303

M3 - Article

VL - 110

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 24

M1 - 245303

ER -