Journal
PHYSICAL REVIEW B
Volume 86, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.060406
Keywords
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Funding
- Federal Special Scientific and Technical Program [02.740.11.0874, 07.514.12.4003]
- RFBR [10-02-01205-a]
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MnSi crystals with chemically induced negative pressure (doped by less than 1% Ge) have been synthesized by the Czochralski method. X-ray powder diffraction has revealed that the samples are crystallized in the B20 structure, inherent to pure MnSi, without any impurity phases. The lattice constant a is slightly larger than that of undoped MnSi. The samples have a spiral spin structure with the wave vector vertical bar k vertical bar = 0.385 nm(-1) at low temperatures. The ordering temperature is enhanced up to T-C = 39 K. The critical field H-C2 shows an increase of about 25% for the doped samples. Close to the critical temperature the A phase occurs. The temperature range of the A phase in the (H-T) phase diagram for the doped compound ranges from TA = 27.5 K, characteristic for pure MnSi, to T-C = 39 K in the zero-field cooled (ZFC) regime of magnetization. The magnetic features of the (H-T) phase diagram of the compounds MnSi are reminiscent of those observed for the MnSi thin films on the Si substrate.
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