A. A. Gippius

Research Field

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Citations (8)

Peculiarities of the nematic transition in FeSe0.675Te0.3S0.025 and its proximity to the quantum critical point

Research Square (Research Square) (2024)

E. A. Ovchenkov Д. А. Чареев A. A. Gippius D. Е. Presnov И. Г. Пузанова

Abstract In this work, we present the studies of structural phase transitions in FeSe_0.675Te_0.3S_0.025 crystals. The data obtained indicate a significant change in the behavior of many characteristics during the transition in this composition compared to the case of the unsubstituted FeSe. The resistivity at low temperatures for the studied FeSe_0.675Te_0.3S_0.025 is proportional to the square of the temperature, while for pure FeSe below the structural transition it depends almost linearly on temperature. ⁷⁷Se NMR studies also confirm a change in the type of phase transition. The NMR data showed a noticeable line broadening below the structural transition and an anomaly in the temperature dependence of the relaxation rate, which was not observed in FeSe. Our results confirm the quantum criticality of Fe(Se,Te) at a low Te content or existence of the nematicity change point (NCP). This makes the phase diagram of quasi-binary Fe(Se,Te) compounds generally consistent with the phase diagram of FeSe under pressure. In both cases, there is a local minimum in the superconducting critical temperature near NCP and a strong increase in the superconducting critical temperature near the point of complete suppression of nematicity.

Critical point (mathematics)

10.21203/rs.3.rs-3981927/v1

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Time relaxation of the untwinned TmBa 2 Cu 3 O 7−δ single crystal remanent magnetization

Physica C Superconductivity (1989)

V. V. Moshchalkov A. A. Gippius В. И. Воронкова A. A. Zhukov

Crystal (programming language)

10.1016/0921-4534(89)90649-7

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Citations (3)

Luminescent characterization of radiation damage and impurities in ion-implanted natural diamond

Diamond and Related Materials (1993)

A. A. Gippius

Characterization

radiation damage

10.1016/0925-9635(93)90196-9

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Citations (21)

TIME RELAXATION OF THE MAGNETIZATION IN A SINGLE-DOMAIN TMBA2CU3O7-DELTA SINGLE-CRYSTAL

JETP Letters (1989)

A. A. Gippius Victor V. Moshchalkov Hh Nyan V. Voronkova V. K. Yanovskiǐ

Single domain

Solid-state physics

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Citations (1)

Secondary Nuclear Spin Echo Signals in Thin Yttrium Iron Ferrite Garnet Films

Journal of Experimental and Theoretical Physics (2020)

V. N. Berzhanskiı̆A. A. Gippius A. I. Gorbovanov С.В. Журенко S. N. Polulyakh

Yttrium Iron Garnet

10.1134/s106377611912015x

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Citations (1)

RADIATIVE RECOMBINATION IN GERMANIUM CRYSTALS SUBJECTED TO FAST ELECTRON BOMBARDMENT

Zhur. Eksptl'. i Teoret. Fiz. (1959)

В.С. Вавилов A. A. Gippius M.M. Gorshkov B. D. Kopylovskii

Data on the infrared spectrum accompanying the recombination of electrons and holes in germanium single crystals are presented. It is shown that with increase of the concentration of Frenkel defects caused by fast electron bombardment the relative intensity of the emission band with a maximum at 2.35 mu also increases. (auth)

Electron bombardment

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<title>Optical characterization of graphitized layers in ion-implanted diamond</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1998)

R.A. Khmelnitskiy V. A. Dravin S.D. Tkachenko A. A. Gippius

Optical interference studies of graphitized layers formed in diamond by ion bombardment and annealing provided the data on the depth and the thickness of the layers as well as their optical parameters. The latter were found to be close to those of dispersed graphite. Cathodoluminescence analysis of diamond samples implanted with fluences below and above the threshold of formation of the graphitized layer has shown that the conditions of formation and/or properties of the optical centers in the area with the buried graphite layer are different form those in the area without the layer which might to be due to the considerable tension in the part of the crystal between the surface and the buried graphitized layer.

Cathodoluminescence

Surface layer

Synthetic diamond

10.1117/12.328208

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Citations (2)

Hg-199 and Cu-(63,65) NMR studies of mercury based high-Tc superconductors

W. Hoffmann Hergen Breitzke Craig T. Simmons K. Lueders Gerd Buntkowsky

Mercury

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