Magnetic Phase Diagram of TmB_{4} under High Pressure

Gabáni, S.; Pristáš, G.; Takáčová, I.; Flachbart, К.; Филипов, В. Б.; Shitsevalova, N. Yu.; Siemensmeyer, K.

doi:10.12693/aphyspola.126.356

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…The asterisks mark averaged values for the regimes where γ varies. Parameters for the cAFM phase are obtained above 10 K. successive magnetic transitions, both showing positive hydrostatic pressure dependencies dT N1/2 /d p ≈ 0.18 K/GPa [26]. While hydrostatic effects may often appear small due to competing uniaxial pressure dependencies canceling each other, our data also imply small uniaxial pressure dependencies, i.e., uniaxial pressure applied neither in-plane nor out-of-plane yields strong changes of the ordering temperatures.…”

Section: Discussionmentioning

confidence: 59%

Magnetoelastic coupling and Grüneisen scaling in NdB4

et al. 2021

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We report high-resolution capacitance dilatometry studies on the uniaxial length changes in a NdB 4 single crystal. The evolution of magnetically ordered phases below T N = 17.2 K [commensurate antiferromagnetic phase (cAFM)], T IT = 6.8 K [intermediate incommensurate phase (IT)], and T LT = 4.8 K [low-temperature phase (LT)] is associated with pronounced anomalies in the thermal expansion coefficients. The data imply significant magnetoelastic coupling and evidence of a structural phase transition at T LT . While both cAFM and LT favor structural anisotropy δ between in-plane and out-of-plane length changes, it competes with the IT type of order, i.e., δ is suppressed in that phase. Notably, finite anisotropy well above T N indicates short-range correlations which are, however, of neither cAFM, IT, nor LT type. Grüneisen analysis of the ratio of thermal expansion coefficient and specific heat enables the derivation of uniaxial as well as hydrostatic pressure dependencies. While α/c p evidences a single dominant energy scale in LT, our data imply precursory fluctuations of a competing phase in IT and cAFM, respectively. Our results suggest the presence of orbital degrees of freedom competing with cAFM, and successive evolution of a magnetically and orbitally ordered ground state.

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Section: Discussionmentioning

confidence: 59%

Magnetoelastic coupling and Grüneisen scaling in NdB4

et al. 2021

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“…This result is quite surprising according to our previous study of TmB 4 [6]. In case of TmB 4 with T N1 = 11.81 K and T N2 = 9.96 K are namely the pressure shifts of Néel temperature dT N1 /dp = 184 mK/GPa and dT N2 /dp = 177 mK/GPa, respectively [6]. The difference in pressure dependence of Néel temperature between TmB 4 and ErB 4 is therefore about a half order of magnitude.…”

Section: Resultsmentioning

confidence: 68%

“…The value of T N is shifted from 15.46 K at 1 bar to 15.58 K at maximum applied pressure of 2.88 GPa (providing dT N /dp = 35 mK/GPa). This result is quite surprising according to our previous study of TmB 4 [6]. In case of TmB 4 with T N1 = 11.81 K and T N2 = 9.96 K are namely the pressure shifts of Néel temperature dT N1 /dp = 184 mK/GPa and dT N2 /dp = 177 mK/GPa, respectively [6].…”

Section: Resultsmentioning

confidence: 85%

Magnetic Phase Diagram of Geometrically Frustrated Magnetic System ErB₄ under High Pressure

Pristáš

Bačkai

Orendáč

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

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Rare-earth tetraborides (REB 4) crystallize in tetragonal crystal structure, where the sublattice of rare-earth ions forms in ab-plane a geometrically frustrated Shastry-Sutherland lattice. In this work we constructed a detailed T N vs. B phase diagram of ErB 4 from data of temperature/field dependencies of resistance. We have applied hydrostatic pressure up to 2.88 GPa using a piston cylinder pressure cell and performed sensitive ac-resistance measurements in temperature range 1.8 K-300 K and in magnetic fields up to 6 T. The obtained results exhibit shifts of ordering temperature T N to higher values as well as shifts of boundaries between different magnetic phases. The effect of pressure on the interaction between magnetic ions in this compound is discussed and compared with the previous results obtained on TmB 4 .

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