Multiple phase transitions in rare earth tetraborides at low temperature

Fisk, Z.; Maple, M. B.; Johnston, D. C.; Woolf, L. D.

doi:10.1016/0038-1098(81)91111-x

Cited by 110 publications

(58 citation statements)

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“…19 The new aspect here is the parameter-free calculation of the CEF splitting of the 4f-electron ground-state multiplet and the almost perfect agreement between various experimental quantities and calculations which only require the introduction of three additional parameters describing the interaction between the ionic magnetic moments. The reason for the discrepancy between our experimental observations and previously reported 2,8 data for the same material is still at the level of speculation. We suspect that it is related to the synthesis procedure.…”

Section: Discussioncontrasting

confidence: 99%

“…[1][2][3] This is particularly intriguing for those cases where the rare-earth ions are non-Kramers ions. The low symmetry of the RE sites provokes a complete lifting of the degeneracy of the Hund's-rule ground-state multiplet into singlet states by the crystal electric field ͑CEF͒, and thus, any phase transition may only be triggered by second-order effects.…”

Section: Introductionmentioning

confidence: 99%

“…The Pr ions adopt a 4f 2 configuration and hence the corresponding Hund's-rule groundstate multiplet, with total angular momentum J = 4, splits into nine singlet states under the influence of the CEF. Previous work on this compound reported a considerable anisotropy of the magnetic susceptibility below room temperature and the onset of ferromagnetic order at a Curie temperature of T C =24 K. 7,8 Our experiments, probing the electrical resistivity, the magnetization, and the specific heat as a function of temperature and, at least partly, in external magnetic fields, reveal two zero-field phase transitions at 19.5 and 15.9 K, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Low-temperature phase transitions in the induced-moment systemPrB4

et al. 2005

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We report the results of measurements of the electrical resistivity, the magnetization, and the specific heat of PrB 4 below room temperature. The crystal electric field ͑CEF͒ splits the 4f 2 multiplet of the Pr ions into nine singlets. In its ground state, PrB 4 is an induced-moment ferromagnet with a saturation magnetization as high as 2.1 B / ͑Pr ion͒. Contrary to previous experiments, we observe a first-order ferromagnetic to antiferromagnetic transition at T C Ϸ 15.9± 0.1 K with a latent heat ⌬Q = 8.6 J / mol. The antiferromagnetic long-range order is quenched above T N = 19.5 K. Susceptibility and specific heat data, as well as the enormous magnetic anisotropy, can quantitatively be reproduced by a mean-field calculation which takes into account the CEF, obtained from a point-charge model using effective charges obtained from a self-consistent electronic band-structure calculation and a Zeeman term, as well as an anisotropic dipolar magnetic exchange and an effective quadrupole-quadrupole interaction term.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-temperature phase transitions in the induced-moment systemPrB4

et al. 2005

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“…It was shown that all heavy REB 4 (RE = Tb, Dy, Ho, Er, Tm) exhibit a strong Ising-like anisotropy which orients the RE magnetic moments along the c-axis, and complex phase diagrams below T N (TbB 4 ) = 43 K, T TN (DyB 4 ) = 20.3 K, T TN (HoB 4 ) = 7.1 K, T TN (ErB 4 ) = 15.4 K and T TN (TmB 4 ) = 11.7 K [1][2][3][4][5]. Moreover, in the ordered antiferromagnetic (AF) state of TmB 4 , the magnetization M for B c reaches saturation M S at about 4 T accompanied by plateaus at 1/8 M S and 1/2 M S .…”

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Magnetic Structure and Phase Diagram of TmB₄

et al. 2008

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Magnetic structure of single crystalline TmB 4 has been studied by magnetization, magnetoresistivity, and specific heat measurements. A complex phase diagram with different antiferromagnetic phases was observed below T N1 = 11.7 K. Besides the plateau at half-saturated magnetization (1/2 M S ), also plateaus at 1/9, 1/8 and 1/7 of MS were observed as a function of applied magnetic field B c. From additional neutron scattering experiments on TmB4, we suppose that these plateaus arise from a stripe structure which appears to be coherent domain boundaries between antiferromagnetic-ordered blocks of 7 or 9 lattice constants. The received results suggest that the frustration among the Tm 3+ magnetic ions, which maps to a geometrically frustrated Shastry-Sutherland lattice, leads to a strong competition between antiferromagnetic and ferromagnetic order. Thus, stripe structures in intermediate field appear to be the best way to minimize the magnetostatic energy against other magnetic interactions among the Tm ions combined with very strong Ising anisotropy.PACS numbers: 75.30.Kz, 75.25.+z IntroductionRare earth tetraborides REB 4 crystallize in a tetragonal structure with the space group P 4/mbm, where the RE ions map to a Shastry-Sutherland type geometrically frustrated lattice (SSL) in the c-plane. It was shown that all heavy REB 4 (RE = Tb, Dy, Ho, Er, Tm) exhibit a strong Ising-like anisotropy which orients the RE magnetic moments along the c-axis, and complex phase dia-

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“…The magnetism of rare earth borides like tetraborides REB 4 , hexaborides REB 6 , and dodecaborides REB 12 has attracted a lot of attention over the years [1][2][3][4][5][6], with recent interesting discoveries still being made such as the complex magnetic structure revealed in REB 12 [7]. These compounds are all good metals in the case of trivalent rare earth elements, and their magnetic coupling has basically been described by the Ruderman-Kittel-Kasuya-Yosida (RKKY) mechanism with possible secondary effects from the dipole-dipole interaction.…”

Section: Introductionmentioning

confidence: 99%

Magnetism of Higher Borides

Mori

2008

Acta Phys. Pol. A

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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 TbB25 system is also investigated further and the transition is assigned to a typical antiferromagnetic transition.

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Multiple phase transitions in rare earth tetraborides at low temperature

Cited by 110 publications

References 4 publications

Low-temperature phase transitions in the induced-moment systemPrB4

Low-temperature phase transitions in the induced-moment systemPrB4

Magnetic Structure and Phase Diagram of TmB₄

Magnetism of Higher Borides

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Multiple phase transitions in rare earth tetraborides at low temperature

Cited by 110 publications

References 4 publications

Low-temperature phase transitions in the induced-moment systemPrB4

Low-temperature phase transitions in the induced-moment systemPrB4

Magnetic Structure and Phase Diagram of TmB4

Magnetism of Higher Borides

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Product

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Magnetic Structure and Phase Diagram of TmB₄