Effect of a magnetic field on the intermediate phase in Mn 1– x  Fe  x  Si: Spin-liquid versus fluctuations scenario

S. V. Demishev; I. I. Lobanova; A. V. Bogach; V. V. Glushkov; V. Yu. Ivanov; T. V. Ischenko; N. A. Samarin; N. E. Sluchanko; S. Gabani; E. Čižmár; K. Flachbart; N. M. Chubova; V. A. Dyadkin; S. V. Grigoriev

doi:10.1134/S0021364016050027

Effect of a magnetic field on the intermediate phase in Mn_1–xFe_xSi: Spin-liquid versus fluctuations scenario

Authors: Demishev S.V.¹^,2, Lobanova I.I.¹^,2, Bogach A.V.¹, Glushkov V.V.¹^,2, Ivanov V.Y.¹, Ischenko T.V.¹, Samarin N.A.¹, Sluchanko N.E.¹, Gabani S.³, Čižmár E.⁴, Flachbart K.³, Chubova N.M.⁵, Dyadkin V.A.⁵^,6, Grigoriev S.V.⁵
Affiliations:
1. Prokhorov General Physics Institute
2. Moscow Institute of Physics and Technology (State University)
3. Institute of Experimental Physics
4. P.J. Šafárik University in Košice
5. Petersburg Nuclear Physics Institute
6. Swiss–Norwegian Beamlines at the European Synchrotron Radiation Facility
Issue: Vol 103, No 5 (2016)
Pages: 321-327
Section: Condensed Matter
URL: https://journals.rcsi.science/0021-3640/article/view/159118
DOI: https://doi.org/10.1134/S0021364016050027
ID: 159118

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Abstract

We report results of the magnetic field influence on the chiral spin liquid state in Mn_1–xFe_xSi single crystal with iron content x = 0.108 in proximity of a hidden quantum critical point. The use of small angle neutron scattering data together with magnetic susceptibility measurements down to 0.4 K and precise magnetoresistance measurements in the temperature range 2–20 K in magnetic field up to 5 T allowed us to construct the magnetic phase diagram of this compound in which at low magnetic fields B < 0.15 T an intermediate phase with short-range magnetic order exists in a wide temperature range 0.62 K < T < 9.1 K. It was found that the increase in magnetic field first results in the suppression of a transition to the spiral phase with long-range magnetic order at very low temperatures, and then induces a transition of the intermediate phase to a spin-polarized (ferromagnetic) phase with lowering temperature. The temperature of this transition T_SP increases with magnetic field logarithmically, T_SP ~ log(B), and results in formation of a singular point on the magnetic phase diagram located at T ~ 8.5 K and B ~ 3.5 T, which may be either a triple or a critical point. The possible spin-liquid nature of the intermediate phase is discussed.

Keywords

JETP Letter, Intermediate Phase, High Magnetic Field, Small Angle Neutron Scattering, Paramagnetic Phase

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Effect of a magnetic field on the intermediate phase in Mn1–xFexSi: Spin-liquid versus fluctuations scenario

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Abstract

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About the authors

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Effect of a magnetic field on the intermediate phase in Mn_1–xFe_xSi: Spin-liquid versus fluctuations scenario