Critical behavior of the magnetic Weyl semimetal PrAlGe

Liu, Wei; Zhao, Jun; Meng, Fanying; Rahman, Azizur; Qin, Yuchang; Fan, Jiyu; Pi, Li; Tian, Zhaoming; Du, Haifeng; Zhang, Lei; Zhang, Yuheng

doi:10.1103/physrevb.103.214401

Cited by 18 publications

(10 citation statements)

References 52 publications

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“…Table 1 lists the critical exponents of NdAlGe, PrAlGe, and those of theoretical models for comparison. The critical exponents of NdAlGe are mostly close to those of a tricitical mean-field model, which is in sharp contrast to the iso-structural PrAlGe of a 2D-Ising-like model [29]. A tricritical phenomenon is known to occur in a system with multiple phases when three phases converge at one point on the phase diagram.…”

Section: Resultsmentioning

confidence: 73%

Field-induced tricritical phenomenon and magnetic structures in magnetic Weyl semimetal candidate NdAlGe

et al. 2022

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Non-centrosymmetric NdAlGe is considered to be a candidate for magnetic Weyl semimetal in which the Weyl nodes can be moved by magnetization. Clarification of the magnetic structures and couplings in this system is thus crucial to understand its magnetic topological properties. In this work, we conduct a systematical study of magnetic properties and critical behaviors of single-crystal NdAlGe. Angle-dependent magnetization exhibits strong magnetic anisotropy along the c-axis and absolute isotropy in the ab-plane. The study of critical behavior with H//c gives critical exponents β = 0.236(2), γ = 0.920(1), and δ = 4.966(1) at critical temperature TC = 5.2(2) K. Under the framework of the universality principle, M(T, H) curves are scaled into universality curves using these critical exponents, demonstrating reliability and self-consistency of the obtained exponents. The critical exponents of NdAlGe are close to the theoretical prediction of a tricritical mean-field model, indicating a field-induced tricritical behavior. Based on the scaling analysis, a H −T phase diagram for NdAlGe with H//c is constructed, revealing a ground state with an up-up- down spin configuration. The phase diagram unveils multiple phases including up-up-down domains, up-up-down ordering state, polarized ferromagnetic (PFM), and paramagnetic (PM) phases, with a tricritical point (TCP) located at the intersection [TT CP = 5.27(1) K, HT CP = 30.1(3) kOe] of up-up-down, PFM, and PM phases. The multiple phases and magnetic structures imply a delicate competition and balance between variable interactions and couplings, laying a solid foundation for unveiling topological properties and critical phenomena in this system.

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Section: Resultsmentioning

confidence: 73%

Field-induced tricritical phenomenon and magnetic structures in magnetic Weyl semimetal candidate NdAlGe

et al. 2022

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“…Some ferromagnetic materials baring quasi-1D crystal structure, such as CrSbSe 3 , − LnCrGe 3 , , Ca 2 Y 2 Cu 5 O 10 , , CoNb 2 O 6 , CsNiF 3 , BaVS 3 , and some organic materials, , are also of potential interest. Compared with these enormous studies on 2D ferromagnets, − the research on the critical behavior and magnetocaloric effect of materials with a 1D crystal structure is relatively rare. ,, Thus, it should be essentially fascinating to provide insight into the magnetic interaction in ferromagnetic systems with a 1D crystal structure. Additional interest for seeking a 1D material with itinerant electrons is due to the possible realization of a Luttinger liquid, in which a nontrivial spin-charge separation is expected. , …”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of the Hexagonal Ferromagnet NdCrGe₃ Showing Metamagnetic Transition and Negative Magnetocaloric Effect

et al. 2021

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Single crystals of a hexagonal ferromagnet NdCrGe 3 with one-dimensional crystal structure are synthesized, and the magnetic properties are comprehensively investigated, exhibiting large magnetic anisotropy and complex magnetic structure. Besides the ferromagnetic transition at T C = 101 K, we observe a sharp decrease in magnetization at T = 55 K and another two phase transitions at T = 31 and 15 K. These phase transitions imply complex and anisotropic magnetic structure in NdCrGe 3 . Below T = 55 K, metamagnetic transitions and negative magnetocaloric effects are detected under H//ab. Additionally, the critical properties around T C = 101 K and the anisotropic magnetocaloric effect are investigated in detail.

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“…The crystal structure of R AlGe ( R = La~Nd) is I4 1 md (space group no. 109), which is a LaAlSi-type noncentrosymmetric structure [ 13 ]. Figure 1 a shows the X-ray diffraction (XRD) pattern of NdAlGe, which is well matched with the I4 1 md structure using the Le Bail method.…”

Section: Resultsmentioning

confidence: 99%

“…The single crystal of NdAlGe was synthesized using the Al self-flux method [ 10 , 11 , 12 , 13 ]. High purity elements of Nd (China Rare Metal Materials Co., Ltd., Chinese mainland, China, 99.9%), Al (Hydro, Oslo, Norway, 99.99%), Ge (Changsha Santech Materials Co., Ltd., Changsha, China, 99.99%) were placed in an Alumina crucible with a molar ratio Nd:Al:Ge = 1:10:1.…”

Section: Methodsmentioning

confidence: 99%

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Anisotropic Metamagnetic Spin Reorientation and Rotational Magnetocaloric Effect of Single Crystal NdAlGe

et al. 2023

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Magnetic anisotropy strongly influences the performance of the magnetocaloric effect. We investigated the magnetocaloric properties of the NdAlGe single crystal with I41md structure. The temperature-dependent magnetization revealed significant anisotropic properties; stable antiferromagnetic transition at TN = 6 K for H//a and meta-magnetic spin reorientation at low temperature (T ≤ 5 K) within an intermediate field (H = 2 T) for H//c. During the metamagnetic spin reorientation, the abrupt change of the magnetic entropy leads to a significant magnetocaloric effect with negative magnetic entropy change (∆SM) by −13.80 J kg−1 K−1 at TC = 5.5 K for H = 5 T along the H//c axis. In addition, the antiferromagnetic state for H//a shows the inverse magnetocaloric effect(I-MCE) by positive entropy change ∆SM = 2.64 J kg−1 K−1 at TN = 6 K for H = 5 T. This giant MCE accompanied by the metamagnetic transition resulted in a significantly large relative cooling power (158 J/kg at H = 5 T) for H//c. The giant MCE and I-MCE can be applied to the rotational magnetocaloric effect (R-MCE) depending on the crystal orientations. NdAlGe exhibits rotational entropy change ∆Sc−a = −12.85 J kg−1 K at Tpeak = 7.5 K, H = 5 T. With comparison to conventional MCE materials, NdAlGe is suggested as promising candidate of R-MCE, which is a novel type of magnetic refrigeration system.

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Critical behavior of the magnetic Weyl semimetal PrAlGe

Cited by 18 publications

References 52 publications

Field-induced tricritical phenomenon and magnetic structures in magnetic Weyl semimetal candidate NdAlGe

Field-induced tricritical phenomenon and magnetic structures in magnetic Weyl semimetal candidate NdAlGe

Magnetic Properties of the Hexagonal Ferromagnet NdCrGe₃ Showing Metamagnetic Transition and Negative Magnetocaloric Effect

Anisotropic Metamagnetic Spin Reorientation and Rotational Magnetocaloric Effect of Single Crystal NdAlGe

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Critical behavior of the magnetic Weyl semimetal PrAlGe

Cited by 18 publications

References 52 publications

Field-induced tricritical phenomenon and magnetic structures in magnetic Weyl semimetal candidate NdAlGe

Field-induced tricritical phenomenon and magnetic structures in magnetic Weyl semimetal candidate NdAlGe

Magnetic Properties of the Hexagonal Ferromagnet NdCrGe3 Showing Metamagnetic Transition and Negative Magnetocaloric Effect

Anisotropic Metamagnetic Spin Reorientation and Rotational Magnetocaloric Effect of Single Crystal NdAlGe

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Magnetic Properties of the Hexagonal Ferromagnet NdCrGe₃ Showing Metamagnetic Transition and Negative Magnetocaloric Effect