Spin glass and glass-like lattice behaviour in HoB₆₆ at low temperatures

V.V. Novikov Bryansk Physical Laboratory, Petrovsky Bryansk State University, Bedgitskaya, 14, 241036, Bryansk, Russia

D.V. Avdashchenko Bryansk Physical Laboratory, Petrovsky Bryansk State University, Bedgitskaya, 14, 241036, Bryansk, RussiaCorrespondence[email protected]

S.L. Bud'ko Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

N.V. Mitroshenkov Bryansk Physical Laboratory, Petrovsky Bryansk State University, Bedgitskaya, 14, 241036, Bryansk, Russia

A.V. Matovnikov Bryansk Physical Laboratory, Petrovsky Bryansk State University, Bedgitskaya, 14, 241036, Bryansk, Russia

H. Kim Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

M.A. Tanatar Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

R. Prozorov Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

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Abstract

The low-temperature specific heat, magnetic susceptibility, and thermal expansion are studied experimentally in the fcc boride HoB₆₆ and compared to similar quantities in non-magnetic LuB₆₆. The anomalous behaviour observed in HoB₆₆ is explained within a glass-like picture together with magnetic subsystem ordering processes. The character of the observed anomalies suggests the existence of a spin-glass phase transition in HoB₆₆ below a characteristic temperature of T _s ≈ 0.98 K.

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Acknowledgements

The work at Bryansk was supported by the RFBR (Grant 11-02-97-502 - r_center_a) and the Russian Ministry of Education and Science (Grant DSP 2.1.1/10747). The work at Ames was supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under contract No. DE-AC02-07CH11358.

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Spin glass and glass-like lattice behaviour in HoB₆₆ at low temperatures

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Spin glass and glass-like lattice behaviour in HoB₆₆ at low temperatures