Signature of spin-triplet exciton condensations in LaCoO$_{3}$ at ultrahigh magnetic fields up to 600 T

Ikeda, Akihiko; Matsuda, Yasuhiro H.; Sato, K.; Ishii, Yasuaki; Sawabe, Hironobu; Nakamura, Daisuke; Takeyama, S.; Nasu, Joji

doi:10.48550/arxiv.2201.02704

Cited by 2 publications

(4 citation statements)

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“…4(a)] and that there is no observation of a phase transition in the specific heat measurements [ 52 ], it is suggested that LaCoO 3 avoids the occurrence of the isostructural phase transition by entering the nonmagnetic LS state. We here note that recent high-magnetic-field magnetostriction studies of LaCoO 3 claimed the emergence of a spin-state-crystallized phase at high magnetic fields above ∼ 70 T and temperatures below ∼ 30 K, where a cubic superlattice of seven-IS-site clusters and LS ions is formed [ 31,32 ]. In Ref.…”

Section: Introductionmentioning

confidence: 76%

“…The HS-IS duality indicates that the Co spin state of LaCoO 3 is strongly affected by the inter-Co-site interactions, which sheds light on the long-standing controversy over HS and IS states under the conventional one-Co-site classification. Very recently, high-magneticfield magnetostriction studies on LaCoO 3 revealed the emergence of magnetic-field-induced multiple spin-state phases at high magnetic fields above ∼70 T and temperatures below ∼100 K, and it has been claimed that these phases originate from the HS-IS duality [ 31,32 ].…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. [ 31,32 ], this spin-state crystallization is considered to originate from the HS-IS duality, where the d electrons of the seven-ISsite cluster are confined but delocalized within the cluster. The Curie-type softening in C B (T ) of LaCoO 3 might correspond to a precursor to the spin-state crystallization that is avoided in a zero magnetic field by entering the nonmagnetic LS state.…”

Section: Introductionmentioning

confidence: 99%

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Symmetry-resolved elastic anomalies in spin-crossover cobaltite LaCoO$_3$

Watanabe¹,

Okada²,

Tomiyasu³

2022

Preprint

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Ultrasound velocity measurements of the pseudo-cubic spin-crossover cobaltite LaCoO3 and the lightly Ni-doped La(Co0.99Ni0.01)O3 reveal two types of symmetry-resolved elastic anomaly in the insulating paramagnetic state that are commonly observed in these compounds. The temperature dependence of the bulk modulus exhibits Curie-type softening upon cooling below 300 K down to ∼70 K, indicating the presence of isostructural lattice instability arising from magnetic fluctuations. The temperature dependence of the tetragonal and trigonal shear moduli exhibits unusual hardening upon cooling below 300 K, indicating the occurrence of elasticity crossover arising from the spin crossover. The present study also reveals that the isostructural lattice instability in LaCoO3 is suppressed by the Ni doping, indicating the suppression of the magnetic fluctuations by the Ni doping in conjunction with the enhancement of electron itinerancy. This Ni doping effect in LaCoO3 can be explained on the basis that the isostructural lattice instability arises from the coupling of the lattice to the Co spin state fluctuating between the high-spin state and intermediate-spin state.

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Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Symmetry-resolved elastic anomalies in spin-crossover cobaltite LaCoO$_3$

Watanabe¹,

Okada²,

Tomiyasu³

2022

Preprint

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show abstract

“…One spectacular example is the finding of the novel 𝜃 phase of solid oxygen, where the antiferromagnetic ordering of the molecular spins are transformed into a ferromagnetic one, resulting in the collapse of the molecular arrangement and crystal structure, leading to the appearance of the new phase [1]. One finds recent discovery at above 100 T not only in the strongly correlated electron systems YbB 12 [2], FeSi [3], VO 2 [4], LaCoO 3 [5][6][7] but also in the quantum spin systems [8], frustrated magnets pyrochlore systems [9] and breathing pyrochlore systems [10].…”

mentioning

confidence: 99%

Generating 77 T using a portable pulse magnet for single shot quantum beam experiments

Ikeda,

Matsuda,

Zhou

et al. 2022

Preprint

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We devised a portable system that generates pulsed high magnetic fields up to 77 T with 3 𝜇s duration. The system employs the single turn coil method, a destructive way of field generation. The system consists of a capacitor of 10.4 𝜇F, a 30 kV charger, a mono air-gap switch, a triggering system, and a magnet clamp, which weighs less than 1.0 tons in total and is transportable. The system offers opportunities for single-shot experiments at ultrahigh magnetic fields in combinations with novel quantum beams. The single-shot x-ray diffraction experiment using x-ray free-electron laser at 65 T is presented. We comment on the possible update of the system for the generation of 100 T.

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Signature of spin-triplet exciton condensations in LaCoO$_{3}$ at ultrahigh magnetic fields up to 600 T

Cited by 2 publications

References 29 publications

Symmetry-resolved elastic anomalies in spin-crossover cobaltite LaCoO$_3$

Symmetry-resolved elastic anomalies in spin-crossover cobaltite LaCoO$_3$

Generating 77 T using a portable pulse magnet for single shot quantum beam experiments

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