Magnetic field- and pressure-induced quantum phase transitions in NH 4CuCl3

Masashi Fujisawa, Budhy Kurniawan R., Toshio Ono, Hidekazu Tanaka

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Quantum antiferromagnet NH4CuCl3 shows magnetization plateaus at 1/4 and 3/4 of the saturation magnetization. Specific heat measurements at ambient pressure and magnetization measurements under hydrostatic pressure were performed on NH4CuCl3 in magnetic fields. From specific heat measurements, we obtained the detailed magnetic phase diagram below 9 T, which includes the lower edge field H c1 of 1/4 plateau. The phase boundary just below Hc1 can be described by a power low, Hc1 - HN(T) ∝ T φ with φ = 2, where HN(T) is the transition field at temperature T. Magnetic susceptibility measurements under pressure revealed reentrant quantum phase transitions, such that the gapless ground state at zero field changes into gapped state with increasing pressure, and further into gapless state again.

Original languageEnglish
Pages (from-to)241-245
Number of pages5
JournalProgress of Theoretical Physics Supplement
Publication statusPublished - 2005


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