Multiple phases with a tricritical point and a Lifshitz point in the skyrmion host 
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Chauhan, Harish Chandr; Kumar, Birendra; Tiwari, Jeetendra Kumar; Ghosh, Subhasis

doi:10.1103/physrevb.100.165143

Cited by 22 publications

(32 citation statements)

References 48 publications

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“…From these results, the possibility of a fluctuation-induced, first-order transition has been discussed for EuPtSi, which is further supported by the recent observation of a tricritcal point [12]. Interestingly, the fluctuation-induced first-order transition has also been suggested to occur in other B20 helimagnets, such as MnSi and Cu 2 OSeO 3 [14][15][16].…”

Section: Introductionsupporting

confidence: 56%

Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: μSR and NMR studies

et al. 2021

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We report the results of muon spin relaxation (μSR) and 29 Si NMR measurements carried out on the cubic chiral magnet EuPtSi. This compound exhibits a helimagnetic transition at T N = 4 K, and hosts a unique skyrmion phase characterized by a short modulation period and strong anisotropy under magnetic fields. Our zero-field μSR experiments revealed the development of critical slowing down of Eu spin fluctuations over a relatively wide critical region (T − T N )/T N < 5 above T N . We also found from 29 Si NMR that the spin fluctuations are strongly suppressed by magnetic field in the paramagnetic state above 20 K. These characteristic spin dynamics observed over a wide region of temperature and magnetic field suggest the presence of magnetic frustration in the spin system. Such frustration would underlie the mechanism stabilizing the short-period skyrmion lattice observed in this compound.

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Section: Introductionsupporting

confidence: 56%

Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: μSR and NMR studies

et al. 2021

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“…All three magnetic phase transitions are second order, and all four phases are 2D Ising FM (below T ), 2D Heisenberg CAFM (T to T and T to T ) and PM (above T ). In this context, it is worthwhile to mention that the existence of competition between different exchange interactions give rise to multiple phases with multiple phase transitions as we have shown recently in Cu OSeO 64 , which is a skyrmion host helimagnetic system.…”

Section: Introductionmentioning

confidence: 74%

Multiple magnetic phase transitions with different universality classes in bilayer La$$_{1.4}$$Sr$$_{1.6}$$Mn$$_{2}$$O$$_7$$ manganite

Kumar

Tiwari

Chauhan

et al. 2021

Sci Rep

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Here, we report three magnetic transitions at 101 K (T$$_{C1}$$ C 1 ), 246 K (T$$_{C2}$$ C 2 ) and 295 K (T$$_{C3}$$ C 3 ) in bilayer La$$_{1.4}$$ 1.4 Sr$$_{1.6}$$ 1.6 Mn$$_{2}$$ 2 O$$_7$$ 7 . The second order phase transitions have been identified at these transition points with the help of change in entropy analysis and modified Arrott plots (MAPs). The critical behavior around T$$_{C1}$$ C 1 , T$$_{C2}$$ C 2 and T$$_{C3}$$ C 3 have been studied by MAPs and Kouvel–Fisher method. Based on these analyses four magnetic phases are: (1) 2D Ising ferromagnetic (FM) below T$$_{C1}$$ C 1 ,(2) 2D Heisenberg canted antiferromagnetic (CAFM-I) and FM clusters in temperature range T$$_{C1}$$ C 1 < T < T$$_{C2}$$ C 2 , (3) 2D Heisenberg CAFM-II and FM clusters with non magnetically interacting planes in temperature range T$$_{C2}$$ C 2 < T < T$$_{C3}$$ C 3 and (4) paramagnetic for T > T$$_{C3}$$ C 3 .

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“…Cu OSeO was grown using solid−state reaction method 40 . High purity CuO (Sigma Aldrich 99.999 %) and (Sigma Aldrich 99.999 %) were taken in the molar ratio of 2:1, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The X-ray diffraction (XRD) data of Cu OSeO were collected using Rigaku Miniflex 600 X-Ray Diffractometer with Cu−K radiation. Phase purity of the sample was confirmed using Rietveld refinement of the XRD data 40 . High precision magnetic measurements were performed using physical properties measurement system.…”

Section: Methodsmentioning

confidence: 99%

“…For example, the physics of MnSi and FeGe are governed by single value of J while the physics of Cu OSeO is governed by using at least four values of J depending on the chosen Cu ions 25 – 27 . The magnetic phase diagram of several skyrmion host magnetic materials have been reported with the help of various techniques such as Lorentz transmission electron microscopy (LTEM) 4 , small-angle neutron scattering (SANS) 4 , specific heat 38 , magnetic susceptibility 38 and magnetic isotherm 39 , 40 . A detailed investigation on different phases and phase transition between them has made it possible to explore the existence of various critical points such as Lifshitz point 40 , tricritical point 38 , 40 , and triple point 41 .…”

Section: Introductionmentioning

confidence: 99%

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Origin of metamagnetism in skyrmion host Cu$$_2$$OSeO$$_3$$

Chauhan

Kumar

Ghosh

2022

Sci Rep

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Skyrmion host chiral Cu$$_2$$ 2 OSeO$$_3$$ 3 has attracted researchers due to several intriguing properties. Observation of metamagnetism in low-temperature and low-field makes the magnetic properties of Cu$$_2$$ 2 OSeO$$_3$$ 3 more complex. Here, we present an investigation on metamagnetism in Cu$$_2$$ 2 OSeO$$_3$$ 3 by analyzing its structural and magnetic properties. Study of magnetic properties reveal spin-flip of one of the Cu$$^{2+}$$ 2 + ions, embedded in square pyramidal CuO$$_5$$ 5 polyhedra, due to the development of strain in low-temperature and low-field regime. The spin-flip is found to be the main reason for field-induced first-order metamagnetic transition. Magnetic phase diagram of Cu$$_2$$ 2 OSeO$$_3$$ 3 has been constructed with the help of magnetization analyses. It is argued that the metamagnetic hysteretic field region may be low-temperature skyrmion phase with additional spiral and tilted-conical phases. A tricritical point has been observed in the phase diagram at which first-order metamagnetic hysteretic field range ceases to exist.

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Multiple phases with a tricritical point and a Lifshitz point in the skyrmion host Cu2OSeO3

Cited by 22 publications

References 48 publications

Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: μSR and NMR studies

Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: μSR and NMR studies

Multiple magnetic phase transitions with different universality classes in bilayer La$$_{1.4}$$Sr$$_{1.6}$$Mn$$_{2}$$O$$_7$$ manganite

Origin of metamagnetism in skyrmion host Cu$$_2$$OSeO$$_3$$

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