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Title: Pressure-Induced Large Volume Collapse, Plane-to-Chain, Insulator to Metal Transition in CaMn2Bi2

Journal Article · · Inorganic Chemistry
 [1];  [2];  [3];  [2];  [2]; ORCiD logo [4]; ORCiD logo [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. Univ. of Hawaii at Manoa, Honolulu, HI (United States)
  3. Univ. of Chinese Academy of Sciences, Beijing (China)
  4. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China) ; Songshan Lake Materials Lab., Dongguan, Guangdong (China)
+ Show Author Affiliations

We report that in situ high pressure single crystal X-ray diffraction study reveals that the quantum material CaMn2Bi2 undergoes a unique plane to chain structural transition between 2 and 3 GPa, accompanied by a large volume collapse. Puckered Mn–Mn honeycomb layer converts to quasi-one-dimensional (1D) zigzag chains above the phase transition pressure. Single crystal measurements reveal that the pressure-induced structural transformation is accompanied by a dramatic 2 orders of magnitude drop of resistivity. Although the ambient pressure phase displays semiconducting behavior at low temperatures, metallic temperature dependent resistivity is observed for the high pressure phase, as surprisingly, are two resistivity anomalies with opposite pressure dependences, while one of them could be a magnetic transition and the other originates from Fermi surface instability. Lastly, assessment of the total energies for hypothetical magnetic structures for high pressure CaMn2Bi2 indicates that ferrimagnetism is thermodynamically favored.

Research Organization:
Louisiana State Univ., Baton Rouge, LA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences (CAS)
Grant/Contract Number:
SC0012432; 2018YFA0305702; 11574377; 11834016; 11874400; XDB25000000; QYZDB-SSW-SLH013
OSTI ID:
1602041
Journal Information:
Inorganic Chemistry, Vol. 58, Issue 14; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Linked Research (3)

Figures / Tables (11)

FIG. 1(p. 3)figure FIG. 1
FIG. 2(p. 4)figure FIG. 2
FIG. 3(p. 6)figure FIG. 3
Table S1(p. 14)table Table S1
Table S2(p. 14)table Table S2
Figure S1(p. 15)figure Figure S1
Fig. S3(p. 17)figure Fig. S3
Figure S2(p. 17)figure Figure S2
Figure S4(p. 19)figure Figure S4
Figure S5(p. 20)figure Figure S5
FIG. S6(p. 21)figure FIG. S6

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