Collaborative Work on Superconducting PdTe2 Published in ACS Nano

Thu, 20 Aug 2026 00:00:00 +0000

A collaborative study with researchers at the University of Notre Dame, led by Kota Yoshimura and co-authored by Dr. Kozawa and Ryo Kitaura, has been published in ACS Nano. Kota spent a short-term stay in the 2D Quantum Materials Group at NIMS, where he developed his chemical vapor deposition (CVD) growth of few-layer PdTe₂. Congratulations!

The work addresses the Pauli limiting field, which bounds the upper critical field of weak-coupling superconductivity and scales inversely with the effective g-factor. Measuring the in-plane upper critical field of few-layer PdTe₂ down to 20 mK, the team found that it is enhanced by more than an order of magnitude as the thickness is reduced from 50 nm to 17 nm. Modeling the temperature- and thickness-dependent behavior revealed a thickness-dependent spin Zeeman depairing mechanism: quantum confinement drives a reduction in the g-factor, which raises the Pauli limiting field and permits the measured enhancement.

Violation of the Pauli limit is often taken as a signature of unconventional pairing symmetry. This work shows that such an association is difficult to make without knowledge of the g-factor, particularly in layered materials.

K. Yoshimura, T.-C. Hsieh, H. Ma, D. V. Chichinadze, S. Zou, M. Stuckert, D. Graf, R. Nowell, M. A. Karim, D. Kozawa, R. Kitaura, B. G. Márkus, L. Forró, X. Liu, D. Jin, X. Liu, C. Lewandowski, Y.-T. Hsu, B. A. Assaf, g-Factor-Enhanced Upper Critical Field in Superconducting PdTe₂ due to Quantum Confinement,

Superconductivity |

Collaborative Work on Superconducting PdTe2 Published in ACS Nano