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Kondo screening in a Majorana metal.
Nat Commun
November 2023
Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea.
Kondo impurities provide a nontrivial probe to unravel the character of the excitations of a quantum spin liquid. In the S = 1/2 Kitaev model on the honeycomb lattice, Kondo impurities embedded in the spin-liquid host can be screened by itinerant Majorana fermions via gauge-flux binding. Here, we report experimental signatures of metallic-like Kondo screening at intermediate temperatures in the Kitaev honeycomb material α-RuCl with dilute Cr (S = 3/2) impurities.
View Article and Find Full Text PDFAntiferromagnetic Spin Fluctuations and Unconventional Superconductivity in Topological Superconductor Candidate YPtBi Revealed by ^{195}Pt-NMR.
Phys Rev Lett
June 2023
Department of Physics, Okayama University, Okayama 700-8530, Japan.
We report ^{195}Pt nuclear magnetic resonance (NMR) measurements on topological superconductor candidate YPtBi, which has broken inversion symmetry and topological nontrivial band structures due to the strong spin-orbit coupling. In the normal state, we find that Knight shift K is field- and temperature independent, suggesting that the contribution from the topological bands is very small at low temperatures. However, the spin-lattice relaxation rate 1/T_{1} divided by temperature (T), 1/T_{1}T, increases with decreasing T, implying the existence of antiferromagnetic spin fluctuations.
View Article and Find Full Text PDFSpin-triplet superconductivity in KCrAs.
Sci Adv
December 2021
Department of Physics, Okayama University, Okayama 700-8530, Japan.
A spin-triplet superconductor can harbor Majorana bound states that can be used in topological quantum computing. Recently, KCrAs and its variants with critical temperature as high as 8 kelvin have emerged as a new class of superconductors with ferromagnetic spin fluctuations. Here, we report a discovery in KCrAs single crystal that the spin susceptibility measured by As Knight shift below is unchanged with the magnetic field applied in the plane but vanishes toward zero temperature when is along the axis, which unambiguously establishes this compound as a spin-triplet superconductor described by a vector order parameter parallel to the axis.
View Article and Find Full Text PDFType-II Clathrate Na Ge from a Redox-Preparation Route.
Chemistry
September 2021
Max-Planck-Institut für Chemische Physik fester Stoffe, Abteilung Chemische Metallkunde, Nöthnitzer Straße 40, 01187, Dresden, Germany.
The metastable type-II clathrate Na Ge was obtained from Na Ge by applying a two-step procedure. At first, Na Ge was reacted at 70 °C with a solution of benzophenone in the ionic liquid (IL) 1,3-dibutyl-2-methylimidazolium-bis(trifluoromethylsulfonyl) azanide. The IL was inert towards Na Ge , but capable of dissolving the sodium salts formed in the redox reaction.
View Article and Find Full Text PDFEvidence for even parity unconventional superconductivity in SrRuO.
Proc Natl Acad Sci U S A
June 2021
Department of Physics & Astronomy, University of California, Los Angeles, CA 90095;
Unambiguous identification of the superconducting order parameter symmetry in [Formula: see text] has remained elusive for more than a quarter century. While a chiral p-wave ground state analogue to superfluid He-A was ruled out only very recently, other proposed triplet-pairing scenarios are still viable. Establishing the condensate magnetic susceptibility reveals a sharp distinction between even-parity (singlet) and odd-parity (triplet) pairing since the superconducting condensate is magnetically polarizable only in the latter case.
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