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1

Magnetism of Higher Borides

100%

Mori T.

Acta Physica Polonica A

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2008

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vol. 113

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issue 1

231-234

EN

Magnetism of borides which contain the B_{12} icosahedra as a structural building block are attracting increasing interest since they exhibit unexpectedly strong magnetic interactions, despite being magnetically dilute f-electron insulators. The magnetic behavior among the different compounds has also been found to be diverse. The f-electron dependence of magnetic B_{12} icosahedra borides is compared, and found to be different from conventional mechanisms. The TbB_{25} system is also investigated further and the transition is assigned to a typical antiferromagnetic transition.

2

Strong-Coupling Features in YB_6 and ZrB_{12} Studied by Point-Contact Spectroscopy

51%

Girovský J., Szabó P., Mori T., Samuely P.

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issue 5

1042-1044

EN

Point-contact spectroscopy studies of the superconducting energy gap and the electron-phonon coupling mechanism are performed on the boron rich YB_6 and ZrB_{12} single crystals. The obtained values of the superconducting energy gaps suggest the strong coupling with 2 Δ/k_{B}T_{c}≈ 4.2 for YB_6 and 2 Δ/k_{B}T_{c}≈ 4.15 for ZrB_{12}. We have observed the dominant soft phonon modes mediating superconductivity in the both samples at energy ≈ 8 meV for YB_6 and ≈ 11 meV in ZrB_{12}, respectively.

3

Magnetic Ordering in Boron-Rich Borides TbB_{66} and GdB_{66}

51%

Flachbart K., Gabani S., Mori T., Siemensmeyer K.

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issue 5

875-876

EN

Magnetic ordering in TbB_{66} and GdB_{66} was investigated at very low temperatures. Measurements of ac susceptibility have shown rather clear features of magnetic ordering below 1 K, at 0.34 K for TbB_{66} and at 0.20 K for GdB_{66}. However, no clear evidence of long range magnetic order was found by neutron scattering experiments. Reasons leading to these observations are discussed.

4

Influence of Pressure on Superconductivity in YB_{6}

33%

Gabáni S., Pristáš G., Takáčová I., Flachbart K., Gažo E., Mori T., Braithwaite D., Samuely P.

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vol. 126

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issue 1

340-341

EN

Magnetoresistivity measurements on a superconducting system of YB_{6} (T_c ≈7.5 K) down to 60 mK at hydrostatic pressures up to 47 kbar are presented. The superconducting transition temperature, as well as the third critical field H_{c3} reveal a linear decrease with increasing pressure with slopes of d ln H_{c3}/dp=-1.1 %/kbar, and d ln T_c/dp=-0.59 %/kbar. From the latter a critical pressure, p_c ≈ 170 kbar, at which T_c vanishes, is determined.

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4 Acta Physica Polonica A

1 2014

2 2010

1 2008

4 Mori T.

2 Flachbart K.

2 Samuely P.

1 Braithwaite D.

1 Gabani S.

1 Gabáni S.

1 Gažo E.

1 Girovský J.

1 Pristáš G.

1 Siemensmeyer K.

1 Szabó P.

1 Takáčová I.

Magnetism of Higher Borides

Strong-Coupling Features in YB_6 and ZrB_{12} Studied by Point-Contact Spectroscopy

Magnetic Ordering in Boron-Rich Borides TbB_{66} and GdB_{66}

Influence of Pressure on Superconductivity in YB_{6}